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1. New Features
1.1 Directory and documentation
- Only common files (SCP and libraries) are in the top level
directory. Individual simulator files are in their individual
directories.
- simh_doc.txt has been split up. simh_doc.txt now documents
only SCP. The individual simulators are documented in separate
text files in their own directories.
- mingw_build.bat is a batch file for the MINGW/gcc environment
that will build all the simulators, assuming the root directory
structure is at c:\sim.
- Makefile is a UNIX make file for the gcc environment that will
build all the simulators, assuming the root directory is at
c:\sim.
1.2 SCP
- DO <file name> executes the SCP commands in the specified file.
- Replicated registers in unit structures can now be declared as
arrays for examine, modify, save, and restore. Most replicated
unit registers (for example, mag tape position registers) have
been changed to arrays.
- The ADD/REMOVE commands have been replaced by SET unit ONLINE
and SET unit OFFLINE, respectively.
- Register names that are unique within an entire simulator do
not have to be prefaced with the device name.
- The ATTACH command can attach files read only, either under
user option (-r), or because the attached file is ready only.
- The SET/SHOW capabilities have been extended. New forms include:
SET <dev> param{=value}{ param ...}
SET <unit> param{=value}{ param ...}
SHOW <dev> {param param ...}
SHOW <unit> {param param ...}
- Multiple breakpoints have been implemented. Breakpoints are
set/cleared/displayed by:
BREAK addr_list{[count]}
NOBREAK addr_list
SHOW BREAK addr_list
1.3 PDP-11 simulator
- Unibus map implemented, with 22b RP controller (URH70) or 18b
RP controller (URH11) (in debug).
- All DMA peripherals rewritten to use map.
- Many peripherals modified for source sharing with VAX.
- RQDX3 implemented.
- Bugs fixed in RK11 and RL11 write check.
1.4 PDP-10 simulator
- ITS 1-proceed implemented.
- Bugs fixed in ITS PC sampling and LPMR
1.5 18b PDP simulator
- Interrupts split out to multiple levels to allow easier
expansion.
1.5 IBM System 3 Simulator
- Written by Charles (Dutch) Owen.
1.6 VAX Simulator (in debug)
- Simulates MicroVAX 3800 (KA655) with 16MB-64MB memory, RQDX3,
RLV12, TSV11, DZV11, LPV11, PCV11.
- CDROM capability has been added to the RQDX3, to allow testing
with VMS hobbyist images.
1.7 SDS 940 Simulator (not tested)
- Simulates SDS 940, 16K-64K memory, fixed and moving head
disk, magtape, line printer, console.
1.8 Altair Z80
- Revised from Charles (Dutch) Owen's original by Peter Schorn.
- MITS 8080 with full Z80 simulation.
- 4K and 8K BASIC packages, Prolog package.
1.9 Interdata
The I4 simulator has been withdrawn for major rework. Look for
a complete 16b/32b Interdata simulator sometime next year.
2. Release Notes
2.1 SCP
SCP now allows replicated registers in unit structures to be
modelled as arrays. All replicated register declarations have
been replaced by register array declarations. As a result,
save files from prior revisions will generate errors after
restoring main memory.
2.2 PDP-11
The Unibus map code is in debug. The map was implemented primarily
to allow source sharing with the VAX, which requires a DMA map.
DMA devices work correctly with the Unibus map disabled.
The RQDX3 simulator has run a complete RSTS/E SYSGEN, with multiple
drives, and booted the completed system from scratch.
2.3 VAX
The VAX simulator will run the boot code up to the >>> prompt. It
can successfully process a SHOW DEVICE command. It runs the HCORE
instruction diagnostic. It can boot the hobbyist CD through SYSBOOT
and through the date/time dialog and restore the hobbyist CD, using
standalone backup. On the boot of the restored disk, it gets to the
date/time dialog, and then crashes.
2.4 SDS 940
The SDS 940 is untested, awaiting real code.
2.5 GCC Optimization
At -O2 and above, GCC does not correctly compile the simulators which
use setjmp-longjmp (PDP-11, PDP-10, VAX). A working hypothesis is
that optimized state maintained in registers is being used in the
setjmp processing routine. On the PDP-11 and PDP-10, all of this
state has been either made global, or volatile, to encourage GCC to
keep the state up to date in memory. The VAX is still vulnerable.
3. Work list
3.1 SCP
- Better ENABLE/DISABLE.
3.2 PDP-11 RQDX3
Software mapped mode, RCT read simulation, VMS debug.
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C
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C
/* ibms3_defs.h: IBM System/3 simulator definitions
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Copyright (c) 2001, Charles E. Owen
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Copyright (c) 1993-2001, 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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*/
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#include "sim_defs.h" /* simulator defns */
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/* Simulator stop codes */
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#define STOP_RSRV 1 /* must be 1 */
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#define STOP_HALT 2 /* HALT */
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#define STOP_IBKPT 3 /* breakpoint */
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#define STOP_INVOP 4 /* program check - invalid op */
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#define STOP_INVQ 5 /* Prog check - invalid Q */
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#define STOP_INVADDR 6 /* Prog check - invalid addr */
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#define STOP_INVDEV 7 /* Prog check - invalid dev cmd */
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#define STOP_NOCD 8 /* ATTN card reader */
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#define RESET_INTERRUPT 77 /* special return from SIO */
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/* Memory */
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#define MAXMEMSIZE 65536 /* max memory size */
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#define AMASK (MAXMEMSIZE - 1) /* logical addr mask */
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#define PAMASK (MAXMEMSIZE - 1) /* physical addr mask */
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#define MEMSIZE (cpu_unit.capac) /* actual memory size */
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#define MAX_DECIMAL_DIGITS 31 /* max size of a decimal number */
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#define CDR_WIDTH 80 /* Max card size */
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#define CDP_WIDTH 80 /* Punch width */
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#define LPT_WIDTH 132
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#define CCT_LNT 132
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#define DSK_SECTSIZE 256 /* Sector length */
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#define DSK_CYLSIZE 256*48 /* Cylinder length */
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/* I/O structure
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The I/O structure is tied together by dev_table, indexed by
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the device number. Each entry in dev_table consists of
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level Interrupt level for device (0-7)
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priority Priority for device (1-8)
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routine IOT action routine
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*/
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struct ndev {
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int32 level; /* interrupt level */
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int32 pri; /* Device priority */
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int32 (*routine)(); /* dispatch routine */
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};
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/* Structure to define operation codes */
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struct opdef {
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char op[6]; /* Mnemonic for op */
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int32 opmask; /* Bits set on in opcode */
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int32 q; /* Qbyte */
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int32 form; /* Forms are:
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0 - 1-byte hex operand
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1 - 1-byte register addr, A-Addr
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2 - A-addr,B-addr,Qbyte
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3 - A-addr,Qbyte
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4 - da,m,n
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5 - da,m,n,cc
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6 - da,m,n,A-addr
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7 - 1-address implict Q
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8 - 2-address implict Q */
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int32 group; /* Group Code:
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0 - Command Format (0xFx)
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1 - 1-address A (0x<C,D,E>x)
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2 - 2-address (0x<0,1,2,4,5,6,8,9,A>x)
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3 - 1-address B (0x<3,7,B>x) */
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};
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