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1. New Features in 2.10-3
1.1 SCP and Libraries
- Added dynamic extension of the breakpoint table.
- Added breakpoint actions.
- Added VMS support for ! (from Mark Pizzolato).
1.2 18b PDP's
- Added RB09 fixed head disk for the PDP-9.
- Added LP09 line printer for the PDP-9 and PDP-15.
- Added variable size support and autosizing to the RF15/RF09.
1.3 PDP-8
- Added variable size support and autosizing to the DF32 and RF08.
1.4 Nova
- Added variable size support and autosizing to the Novadisk.
2. Bugs Fixed in 2.10-3
- 18b PDP RF15/RF09: fixed IOT decoding and address wraparound
logic (found by Hans Pufal).
- 18b PDP RP15: fixed IOT decoding and command initiation.
- HP2100 IPL: changed to full duplex (found by Mike Gemeny).
- HP2100 CPU: fixed last cycle bug in DMA outpout (found by Mike
Gemeny).
- Interdata 16b CPU: fixed bug in SETM, SETMR (found by Mark
Pizzolato).
3. New Features in 2.10 vs prior releases
3.1 SCP and Libraries
- The VT emulation package has been replaced by the capability
to remote the console to a Telnet session. Telnet clients
typically have more complete and robust VT100 emulation.
- Simulated devices may now have statically allocated buffers,
in addition to dynamically allocated buffers or disk-based
data stores.
- The DO command now takes substitutable arguments (max 9).
In command files, %n represents substitutable argument n.
- The initial command line is now interpreted as the command
name and substitutable arguments for a DO command. This is
backward compatible to prior versions.
- The initial command line parses switches. -Q is interpreted
as quiet mode; informational messages are suppressed.
- The HELP command now takes an optional argument. HELP <cmd>
types help on the specified command.
- Hooks have been added for implementing GUI-based consoles,
as well as simulator-specific command extensions. A few
internal data structures and definitions have changed.
- Two new routines (tmxr_open_master, tmxr_close_master) have
been added to sim_tmxr.c. The calling sequence for
sim_accept_conn has been changed in sim_sock.c.
- The calling sequence for the VM boot routine has been modified
to add an additional parameter.
- SAVE now saves, and GET now restores, controller and unit flags.
- Library sim_ether.c has been added for Ethernet support.
- The EVAL command will evaluate a symbolic type-in and display
it in numeric form.
- The ! command (with no arguments) will launch the host operating
system command shell. The ! command (with an argument) executes
the argument as a host operating system command. (Code from
Mark Pizzolato)
- Telnet sessions now recognize BREAK. How a BREAK is transmitted
dependent on the particular Telnet client. (Code from Mark
Pizzolato)
- The sockets library includes code for active connections as
well as listening connections.
- The RESTORE command will restore saved memory size, if the
simulator supports dynamic memory resizing.
3.2 VAX
- Non-volatile RAM (NVR) can behave either like a memory or like
a disk-based peripheral. If unattached, it behaves like memory
and is saved and restored by SAVE and RESTORE, respectively.
If attached, its contents are loaded from disk by ATTACH and
written back to disk at DETACH and EXIT.
- SHOW <device> VECTOR displays the device's interrupt vector.
A few devices allow the vector to be changed with SET
<device> VECTOR=nnn.
- SHOW CPU IOSPACE displays the I/O space address map.
- The TK50 (TMSCP tape) has been added.
- The DEQNA/DELQA (Qbus Ethernet controllers) have been added.
- Autoconfiguration support has been added.
- The paper tape reader has been removed from vax_stddev.c and
now references a common implementation file, dec_pt.h.
- Examine and deposit switches now work on all devices, not just
the CPU.
- Device address conflicts are not detected until simulation starts.
- If the VAX console is attached to a Telnet session, BREAK is
interpreted as console halt.
- The SET/SHOW HISTORY commands enable and display a history of
the most recently executed instructions. (Code from Mark
Pizzolato)
3.3 PDP-11
- SHOW <device> VECTOR displays the device's interrupt vector.
Most devices allow the vector to be changed with SET
<device> VECTOR=nnn.
- SHOW CPU IOSPACE displays the I/O space address map.
- The TK50 (TMSCP tape), RK611/RK06/RK07 (cartridge disk),
RX211 (double density floppy), and KW11P programmable clock
have been added.
- The DEQNA/DELQA (Qbus Ethernet controllers) have been added.
- Autoconfiguration support has been added.
- The paper tape reader has been removed from pdp11_stddev.c and
now references a common implementation file, dec_pt.h.
- Device bootstraps now use the actual CSR specified by the
SET ADDRESS command, rather than just the default CSR. Note
that PDP-11 operating systems may NOT support booting with
non-standard addresses.
- Specifying more than 256KB of memory, or changing the bus
configuration, causes all peripherals that are not compatible
with the current bus configuration to be disabled.
- Device address conflicts are not detected until simulation starts.
- The PDP-11 implements a stub DEUNA/DELUA (XU). The real XU
module will be included in a later release.
3.4 PDP-10
- SHOW <device> VECTOR displays the device's interrupt vector.
A few devices allow the vector to be changed with SET
<device> VECTOR=nnn.
- SHOW CPU IOSPACE displays the I/O space address map.
- The RX211 (double density floppy) has been added; it is off
by default.
- The paper tape now references a common implementation file,
dec_pt.h.
- Device address conflicts are not detected until simulation starts.
- The PDP-10 implements a stub DEUNA/DELUA (XU). The real XU
module will be included in a later release.
3.5 PDP-1
- DECtape (then known as MicroTape) support has been added.
- The line printer and DECtape can be disabled and enabled.
- The PDP-1 supports the Type 24 serial drum (based on recently
discovered documents).
3.6 18b PDP's
- The PDP-4 supports the Type 24 serial drum (based on recently
discovered documents).
3.7 PDP-8
- The RX28 (double density floppy) has been added as an option to
the existing RX8E controller.
- SHOW <device> DEVNO displays the device's device number. Most
devices allow the device number to be changed with SET <device>
DEVNO=nnn.
- Device number conflicts are not detected until simulation starts.
3.8 AltairZ80
- A hard drive has been added for increased storage.
- Several bugs have been fixed.
3.9 HP 2100
- The 12845A has been added and made the default line printer (LPT).
The 12653A has been renamed LPS and is off by default. It also
supports the diagnostic functions needed to run the DCPC and DMS
diagnostics.
- The 12557A/13210A disk defaults to the 13210A (7900/7901).
- The 12559A magtape is off by default.
- New CPU options (EAU/NOEAU) enable/disable the extended arithmetic
instructions for the 2116. These instructions are standard on
the 2100 and 21MX.
- New CPU options (MPR/NOMPR) enable/disable memory protect for the
2100 and 21MX.
- New CPU options (DMS/NODMS) enable/disable the dynamic mapping
instructions for the 21MX.
- The 12539 timebase generator autocalibrates.
- The IOP microinstruction set is supported for the 21MX as well
as the 2100.
- The HP2100 supports the Access Interprocessor Link (IPL).
3.10 Simulated Magtapes
- Simulated magtapes recognize end of file and the marker
0xFFFFFFFF as end of medium. Only the TMSCP tape simulator
can generate an end of medium marker.
- The error handling in simulated magtapes was overhauled to be
consistent through all simulators.
3.11 Simulated DECtapes
- Added support for RT11 image file format (256 x 16b) to DECtapes.
3.12 Terminals Multiplexors
- BREAK detection was added to the HP, DEC, and Interdata terminal
multiplexors.
4. Bugs Fixed in 2.10 vs prior releases
- TS11/TSV05 was not simulating the XS0_MOT bit, causing failures
under VMS. In addition, two of the CTL options were coded
interchanged.
- IBM 1401 tape was not setting a word mark under group mark for
load mode reads. This caused the diagnostics to crash.
- SCP bugs in ssh_break and set_logon were fixed (found by Dave
Hittner).
- Numerous bugs in the HP 2100 extended arithmetic, floating point,
21MX, DMS, and IOP instructions were fixed. Bugs were also fixed
in the memory protect and DMS functions. The moving head disks
(DP, DQ) were revised to simulate the hardware more accurately.
Missing functions in DQ (address skip, read address) were added.
- PDP-10 tape wouldn't boot, and then wouldn't read (reported by
Michael Thompson and Harris Newman, respectively)
- PDP-1 typewriter is half duplex, with only one shift state for
both input and output (found by Derek Peschel)
- PDP-11 console must default to 7b for early UNIX compatibility.
- PDP-11/VAX TMSCP emulator was using the wrong packet length for
read/write end packets.
- Telnet IAC+IAC processing was fixed, both for input and output
(found by Mark Pizzolato).
- PDP-11/VAX Ethernet setting flag bits wrong for chained
descriptors (found by Mark Pizzolato).
5. General Notes
WARNING: The build procedures have changed. There is only one UNIX
makefile. To compile without Ethernet support, simply type
gmake {target|all}
To compile with Ethernet support, type
gmake USE_NETWORK=1 {target|all}
The Mingw batch files require Mingw release 2 and invoke the Unix
makefile. There are still separate batch files for compilation
with or without Ethernet support.
WARNING: V2.10 has reorganized and renamed some of the definition
files for the PDP-10, PDP-11, and VAX. Be sure to delete all
previous source files before you unpack the Zip archive, or
unpack it into a new directory structure.
WARNING: V2.10 has a new, more comprehensive save file format.
Restoring save files from previous releases will cause 'invalid
register' errors and loss of CPU option flags, device enable/
disable flags, unit online/offline flags, and unit writelock
flags.
WARNING: If you are using Visual Studio .NET through the IDE,
be sure to turn off the /Wp64 flag in the project settings, or
dozens of spurious errors will be generated.
WARNING: Compiling Ethernet support under Windows requires
extra steps; see the Ethernet readme file. Ethernet support is
currently available only for Windows, Linux, NetBSD, and OpenBSD.
585 lines
17 KiB
Text
585 lines
17 KiB
Text
To: Users
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From: Bob Supnik
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Subj: Nova Simulator Usage
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Date: 1-Feb-2003
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COPYRIGHT NOTICE
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The following copyright notice applies to both the SIMH source and binary:
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Original code published in 1993-2003, written by Robert M Supnik
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Copyright (c) 1993-2003, Robert M Supnik
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Robert M Supnik shall not
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be used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from Robert M Supnik.
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This memorandum documents the Nova simulator.
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1. Simulator Files
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sim/ sim_defs.h
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sim_rev.h
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sim_sock.h
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sim_tmxr.h
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scp.c
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scp_tty.c
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sim_sock.c
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sim_tmxr.c
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sim/nova/ nova_defs.h
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nova_cpu.c
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nova_clk.c
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nova_dkp.c
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nova_dsk.c
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nova_lp.c
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nova_mta.c
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nova_plt.c
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nova_sys.c
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nova_tt.c
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nova_tt1.c
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2. Nova Features
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The Nova simulator is configured as follows:
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device simulates
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name(s)
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CPU Nova CPU with 32KW of memory
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- hardware multiply/divide
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PTR,PTP paper tape reader/punch
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TTI,TTO console terminal
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TTI1,TTO1 second terminal
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LPT line printer
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PLT plotter
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CLK real-time clock
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DK head-per-track disk controller
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DP moving head disk controller with four drives
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MT magnetic tape controller with eight drives
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The Nova simulator implements these unique stop conditions:
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- reference to undefined I/O device, and STOP_DEV is set
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- more than INDMAX indirect addresses are detected during
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an interrupt
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- more than INDMAX indirect addresses are detected during
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memory reference address decoding
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The Nova loader supports standard binary format tapes. The DUMP command
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is not implemented.
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Most devices can be disabled or enabled, by the commands:
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SET <dev> DISABLED
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SET <dev> ENABLED
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All devices are enabled by default.
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2.1 CPU
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The only CPU options are the presence of the optional instructions
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and the size of main memory.
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SET CPU MDV enable multiply/divide
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SET CPU NOVA3 enable Nova3 instructions
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SET CPU NOVA4 enable Nova4 instructions
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SET CPU NONE disable all optional instructions
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SET CPU 4K set memory size = 4K
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SET CPU 8K set memory size = 8K
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SET CPU 12K set memory size = 12K
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SET CPU 16K set memory size = 16K
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SET CPU 20K set memory size = 20K
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SET CPU 24K set memory size = 24K
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SET CPU 28K set memory size = 28K
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SET CPU 32K set memory size = 32K
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(MDV = unsigned multiply/divide instructions)
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(Nova 3 = unsigned multiply/divide, stack, trap instructions)
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(Nova 4 = unsigned and signed multiply/divide, stack, byte, trap instructions)
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If memory size is being reduced, and the memory being truncated contains
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non-zero data, the simulator asks for confirmation. Data in the truncated
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portion of memory is lost. Initial memory size is 32K.
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CPU registers include the visible state of the processor as well as the
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control registers for the interrupt system.
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name size comments
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PC 15 program counter
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AC0..AC3 16 accumulators 0..3
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C 1 carry
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SR 16 front panel switches
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PI 16 priority interrupt mask
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ION 1 interrupt enable
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ION_DELAY 1 interrupt enable delay for ION
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PWR 1 power fail interrupt
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INT 15 interrupt pending flags
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BUSY 15 device busy flags
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DONE 15 device done flags
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DISABLE 15 device interrupt disable flags
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STOP_DEV 1 stop on undefined IOT
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INDMAX 15 maximum number of nested indirects
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PCQ[0:63] 15 PC prior to last JMP, JMS, or interrupt;
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most recent PC change first
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WRU 8 interrupt character
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2.2 Programmed I/O Devices
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2.2.1 Paper Tape Reader (PTR)
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The paper tape reader (PTR) reads data from a disk file. The POS
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register specifies the number of the next data item to be read. Thus,
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by changing POS, the user can backspace or advance the reader.
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The paper tape reader implements these registers:
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name size comments
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BUF 8 last data item processed
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BUSY 1 device busy flag
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DONE 1 device done flag
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DISABLE 1 interrupt disable flag
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INT 1 interrupt pending flag
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POS 32 position in the input file
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TIME 24 time from I/O initiation to interrupt
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STOP_IOE 1 stop on I/O error
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Error handling is as follows:
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error STOP_IOE processed as
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not attached 1 report error and stop
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0 out of tape or paper
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end of file 1 report error and stop
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0 out of tape or paper
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OS I/O error x report error and stop
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2.2.2 Paper Tape Punch (PTP)
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The paper tape punch (PTP) writes data to a disk file. The POS
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register specifies the number of the next data item to be written.
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Thus, by changing POS, the user can backspace or advance the punch.
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The paper tape punch implements these registers:
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name size comments
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BUF 8 last data item processed
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BUSY 1 device busy flag
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DONE 1 device done flag
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DISABLE 1 interrupt disable flag
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INT 1 interrupt pending flag
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POS 32 position in the output file
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TIME 24 time from I/O initiation to interrupt
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STOP_IOE 1 stop on I/O error
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Error handling is as follows:
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error STOP_IOE processed as
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not attached 1 report error and stop
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0 out of tape or paper
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OS I/O error x report error and stop
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2.2.3 Terminal Input (TTI)
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The terminal input polls the console keyboard for input. Terminal
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input options include the ability to set ANSI mode or limited Dasher
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compatibility mode:
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SET TTI ANSI normal mode
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SET TTI DASHER Dasher mode
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Setting either TTI or TTO changes both devices. In Dasher mode, carriage
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return is changed to newline on input, and ^X is changed to backspace.
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The terminal input implements these registers:
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name size comments
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BUF 8 last data item processed
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BUSY 1 device busy flag
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DONE 1 device done flag
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DISABLE 1 interrupt disable flag
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INT 1 interrupt pending flag
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POS 32 number of characters input
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TIME 24 keyboard polling interval
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2.2.4 Terminal Output (TTO)
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The terminal output writes to the simulator console window. Terminal
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output options include the the ability to set ANSI mode or limited
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Dasher compatibility mode:
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SET TTO ANSI normal mode
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SET TTO DASHER Dasher mode
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Setting either TTI or TTO changes both devices. In Dasher mode, carriage
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return is changed to newline on input, and ^X is changed to backspace.
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The terminal output implements these registers:
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name size comments
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BUF 8 last data item processed
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BUSY 1 device busy flag
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DONE 1 device done flag
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DISABLE 1 interrupt disable flag
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INT 1 interrupt pending flag
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POS 32 number of characters output
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TIME 24 time from I/O initiation to interrupt
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2.2.5 Line Printer (LPT)
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The line printer (LPT) writes data to a disk file. The POS register
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specifies the number of the next data item to be written. Thus,
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by changing POS, the user can backspace or advance the printer.
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The line printer implements these registers:
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name size comments
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BUF 8 last data item processed
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BUSY 1 device busy flag
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DONE 1 device done flag
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DISABLE 1 interrupt disable flag
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INT 1 interrupt pending flag
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POS 32 position in the output file
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TIME 24 time from I/O initiation to interrupt
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STOP_IOE 1 stop on I/O error
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Error handling is as follows:
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error STOP_IOE processed as
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not attached 1 report error and stop
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0 out of paper
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OS I/O error x report error and stop
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2.2.6 Real-Time Clock (CLK)
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The real-time clock (CLK) implements these registers:
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name size comments
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SELECT 2 selected clock interval
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BUSY 1 device busy flag
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DONE 1 device done flag
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DISABLE 1 interrupt disable flag
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INT 1 interrupt pending flag
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TIME0 24 clock frequency, select = 0
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TIME1 24 clock frequency, select = 1
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TIME2 24 clock frequency, select = 2
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TIME3 24 clock frequency, select = 3
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The real-time clock autocalibrates; the clock interval is adjusted up or
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down so that the clock tracks actual elapsed time.
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2.2.7 Plotter (PTP)
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The plotter (PLT) writes data to a disk file. The POS register
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specifies the number of the next data item to be written. Thus,
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by changing POS, the user can backspace or advance the plotter.
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The plotter implements these registers:
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name size comments
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BUF 8 last data item processed
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BUSY 1 device busy flag
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DONE 1 device done flag
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DISABLE 1 interrupt disable flag
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INT 1 interrupt pending flag
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POS 32 position in the output file
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TIME 24 time from I/O initiation to interrupt
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STOP_IOE 1 stop on I/O error
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Error handling is as follows:
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error STOP_IOE processed as
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not attached 1 report error and stop
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0 out of tape or paper
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OS I/O error x report error and stop
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2.2.8 Second Terminal (TTI1, TTO1)
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The second terminal consists of two independent devices, TTI1 and TTO1.
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The additional terminal performs input and output through a Telnet session
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connecting into a user-specified port. The ATTACH command specifies the
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port to be used:
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ATTACH TTI1 <port> set up listening port
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where port is a decimal number between 1 and 65535 that is not being used
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for other TCP/IP activities.
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Once TTI1 is attached and the simulator is running, the terminal listens
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for a connection on the specified port. It assumes that the incoming
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connection is a Telnet connection. The connection remain opens until
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disconnected by the Telnet client, or by a DETACH TTI1 command.
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The second terminal has two options, recognized on both devices, for
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setting limited Dasher-compatibility mode or ANSI mode:
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SET TTI1 ANSI normal mode
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SET TTI1 DASHER Dasher mode
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SET TTO1 ANSI normal mode
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SET TTO1 DASHER Dasher mode
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Setting either TTI1 or TTO1 changes both devices. In Dasher mode, carriage
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return is changed to newline on input, and ^X is changed to backspace.
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The SHOW TTI1 CONNECTIONS command displays the current connection to TTI1.
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The SHOW TTI1 STATISTICS command displays statistics for the current connection.
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The SET TTI1 DISCONNECT{=0} disconnects the current connection.
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The second terminal input implements these registers:
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name size comments
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BUF 8 last data item processed
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BUSY 1 device busy flag
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DONE 1 device done flag
|
|
DISABLE 1 interrupt disable flag
|
|
INT 1 interrupt pending flag
|
|
TIME 24 keyboard polling interval
|
|
|
|
The second terminal output implements these registers:
|
|
|
|
name size comments
|
|
|
|
BUF 8 last data item processed
|
|
BUSY 1 device busy flag
|
|
DONE 1 device done flag
|
|
DISABLE 1 interrupt disable flag
|
|
INT 1 interrupt pending flag
|
|
TIME 24 time from I/O initiation to interrupt
|
|
|
|
2.3 Fixed Head Disk (DK)
|
|
|
|
Fixed head disk options include the ability to set the number of platters
|
|
to a fixed value between 1 and 8, or to autosize the number of platters
|
|
from the attached file:
|
|
|
|
SET RF 1P one platter (256K)
|
|
SET RF 2P two platters (512K)
|
|
SET RF 3P three platters (768K)
|
|
SET RF 4P four platters (1024K)
|
|
SET RF 5P five platters (1280K)
|
|
SET RF 6P six platters (1536K)
|
|
SET RF 7P seven platters (1792K)
|
|
SET RF 8P eight platters (2048K)
|
|
SET RF AUTOSIZE autosized on attach
|
|
|
|
The default is 8P (maximum size).
|
|
|
|
The fixed head disk controller implements these registers:
|
|
|
|
name size comments
|
|
|
|
STAT 16 status
|
|
DA 16 disk address
|
|
MA 16 memory address
|
|
BUSY 1 device busy flag
|
|
DONE 1 device done flag
|
|
DISABLE 1 device disable flag
|
|
INT 1 interrupt pending flag
|
|
WLK 8 write lock switches
|
|
TIME 24 rotational delay, per sector
|
|
STOP_IOE 1 stop on I/O error
|
|
|
|
The fixed head disk controller supports the BOOT command.
|
|
|
|
Error handling is as follows:
|
|
|
|
error STOP_IOE processed as
|
|
|
|
not attached 1 report error and stop
|
|
0 disk not ready
|
|
|
|
Fixed head disk data files are buffered in memory; therefore, end of file
|
|
and OS I/O errors cannot occur.
|
|
|
|
2.4 Moving Head Disk (DP)
|
|
|
|
Moving head disk options include the ability to make units write enabled or
|
|
write locked, and to select the type of drive:
|
|
|
|
SET DPn LOCKED set unit n write locked
|
|
SET DPn WRITEENABLED set unit n write enabled
|
|
SET DPn FLOPPY set unit n to floppy disk
|
|
SET DPn D31 set unit n to Diablo 31
|
|
SET DPn D44 set unit n to Diablo 44
|
|
SET DPn C111 set unit n to Century 111
|
|
SET DPn C114 set unit n to Century 114
|
|
SET DPn 6225 set unit n to 6225
|
|
SET DPn 6099 set unit n to 6099
|
|
SET DPn 6227 set unit n to 6227
|
|
SET DPn 6070 set unit n to 6070
|
|
SET DPn 6103 set unit n to 6103
|
|
SET DPn 4231 set unit n to 4231
|
|
|
|
Units can also be set ONLINE or OFFLINE. The moving head disk controller
|
|
supports the BOOT command.
|
|
|
|
All drives have 256 16b words per sector. The other disk parameters are:
|
|
|
|
drive cylinders surfaces sectors size (MW) DG models
|
|
|
|
floppy 77 1 8 .158 6038
|
|
D31 203 2 12 1.247 4047, 4237, 4238
|
|
D44 408 4 12 5.014 4234, 6045
|
|
C111 203 10 6 3.118 4048
|
|
C114 203 20 12 12.472 4057, 2314
|
|
6225 245 2 20 2.508
|
|
6099 192 4 32 6.291
|
|
6227 245 6 20 7.526
|
|
6070 408 4 24 10.027
|
|
6103 192 8 32 12.583
|
|
4231 411 19 23 45.979
|
|
|
|
The moving head disk controller implements these registers:
|
|
|
|
name size comments
|
|
|
|
FCCY 16 flags, command, cylinder
|
|
USSC 16 unit, surface, sector, count
|
|
STAT 16 status
|
|
MA 16 memory address
|
|
BUSY 1 device busy flag
|
|
DONE 1 device done flag
|
|
DISABLE 1 interrupt disable flag
|
|
INT 1 interrupt pending flag
|
|
STIME 24 seek time, per cylinder
|
|
RTIME 24 rotational delay
|
|
|
|
Error handling is as follows:
|
|
|
|
error processed as
|
|
|
|
not attached disk not ready
|
|
|
|
end of file assume rest of disk is zero
|
|
|
|
OS I/O error report error and stop
|
|
|
|
2.5 Magnetic Tape (MT)
|
|
|
|
Magnetic tape options include the ability to make units write enabled or
|
|
or write locked.
|
|
|
|
SET MTn LOCKED set unit n write locked
|
|
SET MTn WRITEENABLED set unit n write enabled
|
|
|
|
Units can also be set ONLINE or OFFLINE. The magnetic tape controller
|
|
supports the BOOT command.
|
|
|
|
The magnetic tape controller implements these registers:
|
|
|
|
name size comments
|
|
|
|
CU 16 command, unit
|
|
MA 16 memory address
|
|
WC 16 word count
|
|
STA1 16 status word 1
|
|
STA2 16 status word 2
|
|
EP 1 extended polling mode (not supported)
|
|
BUSY 1 device busy flag
|
|
DONE 1 device done flag
|
|
DISABLE 1 interrupt disable flag
|
|
INT 1 interrupt pending flag
|
|
STOP_IOE 1 stop on I/O error
|
|
CTIME 24 controller delay
|
|
RTIME 24 record delay
|
|
UST[0:7] 32 unit status, units 0-7
|
|
POS[0:7] 31 position, units 0-7
|
|
|
|
Error handling is as follows:
|
|
|
|
error processed as
|
|
|
|
not attached tape not ready
|
|
|
|
end of file bad tape
|
|
|
|
OS I/O error report error and stop
|
|
|
|
2.6 Symbolic Display and Input
|
|
|
|
The Nova simulator implements symbolic display and input. Display is
|
|
controlled by command line switches:
|
|
|
|
-a display as ASCII character
|
|
-c display as two character ASCII string
|
|
-m display instruction mnemonics
|
|
|
|
Input parsing is controlled by the first character typed in or by command
|
|
line switches:
|
|
|
|
' or -a ASCII character
|
|
" or -c two character ASCII string
|
|
alphabetic instruction mnemonic
|
|
numeric octal number
|
|
|
|
Instruction input uses standard Nova assembler syntax. There are three
|
|
instruction classes: memory reference, IOT, and operate.
|
|
|
|
Memory reference instructions have the format
|
|
|
|
memref {ac,}{@}address{,index}
|
|
|
|
LDA and STA require an initial register; ISZ, DSZ, JSR, and JMP do not.
|
|
The syntax for addresses and indices is as follows:
|
|
|
|
syntax mode displacement comments
|
|
|
|
0 <= n < 0400 0 n
|
|
{+/-}n >= 0400 1 {+/-}n - PC must be in range [-200, 177]
|
|
invalid on disk
|
|
.+/-n 1 {+/-}n must be in range [-200, 177]
|
|
{+/-}n,2 2 {+/-}n must be in range [-200, 177]
|
|
{+/-}n,3 3 {+/-}n must be in range [-200, 177]
|
|
|
|
IOT instructions have one of four formats
|
|
|
|
syntax example
|
|
|
|
iot HALT
|
|
iot reg INTA
|
|
iot device SKPDN
|
|
iot reg,device DOAS
|
|
|
|
Devices may be specified as mnemonics or as numbers in the range 0 - 077.
|
|
|
|
Operate instructions have the format
|
|
|
|
opcode{#} reg,reg{,skip}
|
|
|
|
In all Nova instructions, blanks may be substituted for commas as field
|
|
delimiters.
|