[Simh] IBM 650 Simulator Release 4

Sat May 16 06:35:36 EDT 2020

Hi All

The Release 4 of the IBM 650 computer simulator is available from the Computer History Simulation Project (SIMH) site: https://github.com/simh/simh

This release is focused on Disk and Tape devices.
I've recovered some interesting software, ready to test in SW/ directory

·         Donald Knuth SuperSoap: the most advanced assembler IMHO, full of nice programming tricks like a subroutine computing return address!

·         Regional Assembler from Missile Systems Division Lockheed Aircraft Corporation: Seems to be very similar to IBM 701 Regional Assembler: no mnemonics!, just regions to allow code to be at non-absolute addresses

On the hardware side, still unimplemented the inquiry stations, as I've spotted no sw at all that use them. Any help is welcome.

Any comment/suggestion is also very welcome.
Best regards
Roberto

This is a summary of what's new

o    New Hardware support:

§  IBM 650 Model 4 with 4000 words drum memory.

§  IBM 652 Control Unit: provides up to 6 tape units IBM 727

§  Table LookUp on equal feature (provides TLE opcode)

§  IBM 355 RAMAC Disk Storage

o    New Software included:

§  SOAP IIA-4000 multipass assembler

§  SOAP IIA-4000 Tape Librarian

§  Regional Assembler

§  SuperSoap

o    New features:

§  CARDDECK SPLIT command now allows to split availability table deck and condensed 5-word-per-load-card deck.

o    The usual bug correction pack

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