a5feaf2815
- Add 1752 Drum support. Allow shared subroutines across interrupt levels. - Document and add sample scripts for customizing MSOS5.
189 lines
8.1 KiB
Text
189 lines
8.1 KiB
Text
Customizing MSOS 5 For the CDC 1700 Simulator
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=============================================
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1. Overview
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Each MSOS 5 customer was provided with at least 2 sets of distribution
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materials for MSOS 5 (on punched cards or magnetic tape):
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1. A full distribution of all possible system modules for all supported
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hardware confugurations (the Fortran library on the other hand is
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tailored for a particular installation).
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2. A distribution tailored for a specific installation. It only contains
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device drivers for a specific configuration and may or may not include
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modules from the Fortran run-time library.
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Unfortunately none of the full distribution kits have survived so we will
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have to make use of a tailored distribution. This means that we will only be
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able to remove device drivers and make small modifications to a running system.
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System customization consists of making modifications to 1 or 2
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source-level components:
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1. The system skeleton which describes which is read by the initializer and
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defines which components should be loaded into the system image and
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specifies which components should be loaded on the library disk. The
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skeleton is also able to define global values by the system.
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2. SYSDAT. This an assembler source file which describes the peripheral
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configuration including interrupts and equipment addresses. Optional
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components, such as file manager, may have dedicated sections of SYSDAT.
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The system skeleton may be extracted and edited by an application called SKED.
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This is a very primitive line editor but, fortunately, most of the changes are
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in SYSDAT. SYSDAT is usually provided as the last file present on a tailored
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magtape distribution. Unfortunately I have been unable to use MSOS tools to
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extract a useable version from a magtape so I wrote Unix tools to manipulate
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magtape containers and compress/decompress COSY format files (rawtap & cosy).
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Each customization builds on the previous version to change setting and/or
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change MSOS drivers. Each customization is driven by a simh script, takes an
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existing installation tape (typically MSOS5_SL136.tap) and generates a new
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installation tape (MSOS5-Install.trap). When SYSDAT needs to be modified, a
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sysdat.asm file is present which needs to be converted to fixed size (80
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characters) records and written to a magtape container:
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dd if=sysdat.asm of=sysdat.asm.blk cbs=80 conv=block
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rawtap -c sysdat.tap -r 80 sysdat.asm.blk
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To perform a customization, a running installation generated by
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msosInstall.simh is required. If necessary, create sysdat.tap as described
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above (customizations 2 - 5) and run the simulator:
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cdc1700 msosCustomX.simh <install tape>
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where X is 1 to 5 depending on which customization is required. <install tape>
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does not need to be specified if it is MSOS5_SL136.tap in the current
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directory. The script will run through the customization steps and generate a
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new install tape (MSOS5-Install.tap). msosInstall.simh can be used with this
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tape to create a customized system.
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Each customization directory includes msosCustomX.simh as well as sysdat.asm
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and sysdat.tap (customization 1 does not require sysdat changes so it only
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contains msosCustom1.simh.
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2. Customization 1
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This customization changes the creation date of the OS which is
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output to the console when the system boots. The changes are in-line in
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msosCustom1.simh. SYSMON, SYSDAY and SYSYER modified by SKED. The values are
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the month, day and year in ASCII (high byte first).
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3. Customization 2
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This customization also changes the name of the system from "EXXON
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DEVELOPMENT SYSTEM" to "SIMH DEVELOPMENT SYSTEM". Note that the SYSDAT module
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name still includes "EXXON DEVELOPMENT SYSTEM" since there is no way to delete
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a module and include a new one, only the ability to replace an existing module
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is available.
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4. Customization 3
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The default installation from MSOS5_SL136.tap sets up all four disk
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drives as well as the drum for file storage. I have been unable to find a
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method for initializing the disk space for anything other than the the
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library disk (CDD0/CDD1). This customization changes the file manager
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configuration to only use the library disk for storage. This change gets rid
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of one of the verification errors.
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5. Customization 4
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This customization gets rid of the 1743-2 Asynch communications
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controller drive. There is no documentation for this device and it appears to
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be used for the TIMESHARE option for which there are no good tapes available.
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6. Customization 5
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This customization adds support for a 10336 real-time clock which
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interrupts at ~60Hz. After all of the above modifications, an example run of
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the system:
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MSOS 5.0--PSR LEVEL 120 04/19/17
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SET PROGRAM PROTECT
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SIMH DEVELOPMENT SYSTEM
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65K MODE
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CHECKING FILES - OK
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ENTER DATE/TIME MMDDYYHHMM
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0508891516
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DATE: 08 MAY 89 TIME: 1516:00
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MI
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*BATCH
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J
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*JOB
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J
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*K,L4
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J
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*LULIST
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E10
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LOG1A
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SYSID
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SYSYER
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SYSDAY
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SYSMON
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E *E
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MSOS 5.0 LOGICAL UNIT LISTING FOR SIMH DEVELOPMENT SYSTEM 04/19/17
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LU. EQUIPMENT DESCRIPTION READ/WRITE CLASS CODE EQ NO
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01. SOFTWARE CORE ALLOCATOR READ/WRITE NO CLASS CODE EQ 00
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02. SOFTWARE DUMMY ALTERNATE DEVICE READ/WRITE NO CLASS CODE EQ 00
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03. SOFTWARE DUMMY ALTERNATE DEVICE READ/WRITE NO CLASS CODE EQ 00
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04. 1711 TELETYPEWRITER READ/WRITE TELETYPE EQ 01
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05. COSY UNIT READ/WRITE MAGNETIC TAPE EQ 00
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06. 1732-3/616-92 MAG TAPE READ/WRITE MAGNETIC TAPE EQ 07
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07. PSEUDO TAPE UNIT READ/WRITE MAGNETIC TAPE EQ 00
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08. 1733-2/856-4 DISK UNIT (4.5M) READ/WRITE MASS STORAGE EQ 03
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09. 1742-120 LINE PRINTER WRITE ONLY LINE PRINTER EQ 04
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10. 1732-3/616-92 MAG TAPE READ/WRITE MAGNETIC TAPE EQ 07
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11. 1728/430 CARD READER/PUNCH READ/WRITE CARD RDR/PUNCH EQ 10
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12. 1742-120 LINE PRINTER WRITE ONLY LINE PRINTER EQ 04
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13. 1733-2/856-4 DISK UNIT (4.5M) READ/WRITE MASS STORAGE EQ 03
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14. 1733-2/856-4 DISK UNIT (4.5M) READ/WRITE MASS STORAGE EQ 03
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15. 1733-2/856-4 DISK UNIT (4.5M) READ/WRITE MASS STORAGE EQ 03
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16. 1732-3/616-92 MAG TAPE READ/WRITE MAGNETIC TAPE EQ 07
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17. 1732-3/616-92 MAG TAPE READ/WRITE MAGNETIC TAPE EQ 07
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18. 1732-3/616-92 MAG TAPE READ/WRITE MAGNETIC TAPE EQ 07
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19. PSEUDO TAPE UNIT READ/WRITE MAGNETIC TAPE EQ 00
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20. PSEUDO TAPE UNIT READ/WRITE MAGNETIC TAPE EQ 00
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21. PSEUDO TAPE UNIT READ/WRITE MAGNETIC TAPE EQ 00
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22. PSEUDO DISK DRIVER READ/WRITE MASS STORAGE EQ 00
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23. PSEUDO DISK DRIVER READ/WRITE MASS STORAGE EQ 00
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24. PSEUDO DISK DRIVER READ/WRITE MASS STORAGE EQ 00
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25. PSEUDO DISK DRIVER READ/WRITE MASS STORAGE EQ 00
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26. 1752 DRUM UNIT READ/WRITE MASS STORAGE EQ 02
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27. COSY UNIT READ/WRITE MAGNETIC TAPE EQ 00
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28. 1728/430 CARD READER/PUNCH READ/WRITE CARD RDR/PUNCH EQ 10
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29. 1732-3/616-92 MAG TAPE READ/WRITE MAGNETIC TAPE EQ 07
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30. 1732-3/616-92 MAG TAPE READ/WRITE MAGNETIC TAPE EQ 07
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31. 1732-3/616-92 MAG TAPE READ/WRITE MAGNETIC TAPE EQ 07
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32. 1742-120 LINE PRINTER WRITE ONLY LINE PRINTER EQ 04
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33. 1728/430 CARD READER/PUNCH READ/WRITE CARD RDR/PUNCH EQ 10
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34. 1711 TELETYPEWRITER READ/WRITE TELETYPE EQ 01
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J
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7. RPG II and Cobol Installation
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While installation materials for both RPG II and Cobol are available
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on bitsavers.org (141_PRODUCT_SET.tap contains both) they are built to run
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in core partition 3 which does not exist in the standard distribution tape
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(MSOS5_SL136.tap). There does not appear to be sufficient documentation
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available to add another partition.
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