For the past couple of years or so, I have been working on a SIMH-based simulator for the CDC1700 series, a 16-bit system from the mid-1960's, using the documentation and software available at bitsavers. It has now sufficiently stable to allow others to make use ot the software. The base system implements:
- a 1714 CPU with: - 1705 multi-level interrupts and direct storage access bus - up to 32KW of memory - memory protect system - Optional 64KW support - 1711-A teletypewriter - 1721-A paper tape reader - 1723-A paper tape punch - 1740 or 1742-30 line printer - 1738-B disk pack controller with up to 2 disk packs: (853 disk pack - 1.5MW) (854 disk pack - 3.0MW) - 1733-2 cartridge disk controller with up to 4 drives: Each drive has 1 fixed disk and 1 removeable disk: (856-2 CDD - 1.13MW per disk) (856-4 CDD - 2.25MW per disk) - 1732-A or 1732-3 magtape controller with 4 transports The simulator is able to boot the diagnostic tape (SYSTEM17_SMM_DIAGS.TAP at bitsavers.org) and successfully execute tests for each of the above components. Some test sections fail due to various reasons; lack of documentation, timing issues, feature not implemented etc. The simulator is also able to boot and install MSOS 5 from an installation tape (MSOS5_SL136.tap at bitsavers.org) onto a 1733-2 cartridge drive. This is a copy of a distribution tape provided by CDC to run on a 64KW system at Exxon. I would like to thank Doug Gwyn for answering questions about the system architecture and providing details about specific diagnostics tests and Al Kossow for for peripheral documentation so that I could get MSOS 5 installed.
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