VDM-1 and the Processor Technology Subsystem B ...

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Walt Perko

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Feb 2, 2026, 12:59:38 PM (10 days ago) Feb 2
to Altair 8800
Hi,  

With good working boards, the next step starts with this demo video by Mike:  
https://www.youtube.com/watch?v=RKjDf_9AkPA  

Mike's setup is an Altair 8800c:  
Reproduction MITS 8080 CPU board
Processor Technology 16K RAM
Processor Technology VDM-1 board
Processor Technology CUTS board
SSM IO4 board

Eiki 3270A Cassette Tape Recorder Player
Wyse Terminal


Processor Technology GPM board   Normally used
Processor Technology 3P+S board  Normally used

SSM IO4 board SetUp:  
SSM IO4 SetUp for Subsystem B.jpg


Maybe somebody can add the cable diagram for the SSM IO4 Keyboard & Terminal and then another cable diagram for the CUTS board Audio I/O  


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Walt Perko

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Feb 2, 2026, 1:03:26 PM (10 days ago) Feb 2
to Altair 8800
Hi, 

Another variation on a theme:  Using the FlexRAM board to host the CUTTER ROM and moving the software further up into high RAM to allow for larger programs.  




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Peter Sterrantino

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Feb 2, 2026, 4:29:14 PM (10 days ago) Feb 2
to Altair 8800
Does the VDM- 2021 have a keyboard input?  

Pete

Walt Perko

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Feb 2, 2026, 4:32:14 PM (10 days ago) Feb 2
to Altair 8800
Hi, 

No, you use a serial keyboard or an external terminal like in Mike's video.  Watch the Ressurecting video:   https://www.youtube.com/watch?v=RKjDf_9AkPA   



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