9b62da6567
This commit introduces dozens of changes to make the 3B2-700 simulator fully functional and ready for wider use. In addition to 3B2-700 availability, this commit includes a tremendous amount of refactoring of the 3B2-400 and common code to make the project structure easier to maintain and reason about. One final important change: ROM files are no longer included in the source code. 3B2 ROM images must be obtained separately and loaded into the simulator before boot. Changes: - The 3b2 target has been aliased to 3b2-400 - The formerly named 3b2-600 project has become 3b2-700 - SCSI QIC tape support has been added to sim_scsi.c - Header files have been reworked to reduce complexity of includes - Common code has been consolidated - Timer code has been unified
135 lines
3.9 KiB
Markdown
135 lines
3.9 KiB
Markdown
AT&T 3B2 Simulator
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==================
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This module contains the source for two simulators:
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1. A simulator for the AT&T 3B2/400 computer (3b2 or 3B2.EXE)
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2. A simulator for the AT&T 3B2/700 computer (3b2-700 or 3B2-700.EXE)
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The 3B2/400 simulator is complete, usable, and robust. The 3B2/700
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simulator is under active development and is not yet considered
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stable.
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Full documentation for the 3B2 simulator is available here:
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- https://loomcom.com/3b2/emulator.html
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3B2/400 Simulator Devices
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-------------------------
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The following devices are simulated. The SIMH names for the simulated
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devices are given in parentheses:
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- 3B2 Model 400 System Board with 1MB, 2MB, or 4MB RAM (CSR, NVRAM)
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- WE32100 CPU (CPU)
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- WE32101 MMU (MMU)
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- PD8253 Interval Timer (TMR)
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- AM9517 DMA controller (DMAC)
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- SCN2681A Integrated DUART (IU)
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- TMS2793 Integrated Floppy Controller (IFLOPPY)
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- uPD7261A Integrated MFM Fixed Disk Controller (IDISK)
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- Non-Volatile Memory (NVRAM)
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- MM58174A Time Of Day Clock (TOD)
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- CM195A Ethernet Network Interface (NI)
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- CM195B 4-port Serial MUX (PORTS)
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- CM195H Cartridge Tape Controller (CTC)
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3B2/400 Simulator Usage
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-----------------------
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To boot the 3B2 simulator into firmware mode, simply type:
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sim> BOOT
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You will be greeted with the message:
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FW ERROR 1-01: NVRAM SANITY FAILURE
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DEFAULT VALUES ASSUMED
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IF REPEATED, CHECK THE BATTERY
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FW ERROR 1-02: DISK SANITY FAILURE
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EXECUTION HALTED
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SYSTEM FAILURE: CONSULT YOUR SYSTEM ADMINISTRATION UTILITIES GUIDE
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NVRAM and Time of Day can be saved between boots by attaching both
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devices to files.
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sim> ATTACH NVRAM <nvram-file>
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sim> ATTACH TOD <tod-file>
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If you have no operating system installed on the hard drive, on
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subsequent boots you will instead see the message
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SELF-CHECK
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FW ERROR 1-02: DISK SANITY FAILURE
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EXECUTION HALTED
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SYSTEM FAILURE: CONSULT YOUR SYSTEM ADMINISTRATION UTILITIES GUIDE
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Once you see the `SYSTEM FAILURE` message, this is actually an
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invisible prompt. To access firmware mode, type the default 3B2
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firmware password `mcp`, then press Enter or carriage return.
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You should then be prompted with:
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Enter name of program to execute [ ]:
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Here, you may type a question mark (?) and press Enter to see a list
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of available firmware programs.
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Booting UNIX SVR3 on the 3B2/400
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--------------------------------
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UNIX System V UNIX is the only operating system available for the 3B2.
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To boot UNIX, attach the first disk image from the 3B2 "Essential
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Utilities" distribution.
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sim> ATTACH IFLOPPY <floppy-image>
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sim> BOOT
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Once you reach the `SYSTEM FAILURE` message, type `mcp` to enter
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firmware mode. When prompted for the name of a program to boot, enter
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`unix`, and confirm the boot device is `FD5` by pressing Enter or
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carriage return.
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Enter name of program to execute [ ]: unix
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Possible load devices are:
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Option Number Slot Name
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---------------------------------------
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0 0 FD5
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Enter Load Device Option Number [0 (FD5)]:
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Installing SVR3 on the 3B2/400
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------------------------------
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To install SVR3 to the first hard disk, first, attach a new image
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to the IDISK0 device:
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sim> ATTACH IDISK0 <hd-image>
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Then, boot the file `idtools` from the "3B2 Maintenance Utilities -
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Issue 4.0" floppy diskette.
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From `idtools`, select the `formhard` option and low-level format
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integrated disk 0. Parameters for the default 72MB hard disk are:
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Drive Id: 5
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Number cylinders: 925
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Number tracks/cyl: 9
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Number sectors/track: 18
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Number bytes/sector: 512
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After low-level formatting integrated disk 0, boot the file `unix`
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from the first diskette of the 3B2 "Essential Utilities" distribution,
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and follow the prompts.
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More information about installing AT&T System V Release 3.2 UNIX is
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available on the web:
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- https://loomcom.com/3b2/installing_unix.html
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