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:

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
.