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Thread: MITS 88-SIO Wiring (A & C)

  1. #1
    Join Date
    Jun 2003
    Location
    Northwest (UK)
    Posts
    344

    Default MITS 88-SIO Wiring (A & C)

    Hi Folks!

    I'm in the process of getting my Altair 8800 up and running. The machine has a pair of 88-SIO cards installed. A type A (RS232) and a type C (20ma TTY). I'm a little unsure how I go about wiring these up to a 25pin port on the rear of the machine. The Tx & Rx on the RS232 board is straightforward but do I need the handshaking?

    Anybody have wiring diagrams for these boards?

    Cheers,
    Dave

  2. #2

    Default

    Here are several docs related to the SIO. Verify yours has been updated to the Rev 1 flavor. Most all have.

    http://deramp.com/downloads/index.ph...l_interface%2F

    Mike

  3. #3
    Join Date
    Jun 2003
    Location
    Northwest (UK)
    Posts
    344

    Default

    Thanks for the link Mike. The boards had already been updated to Rev.1 and I've managed to create the cables from the information in those PDFs. Unfortunately, a tantalum cap on one of the memory boards has gone pop and seems to have taken out part of the front panel. Run doesn't seem to work although single step and the other functions do. I think this is going to be a job for the weekend when I've got a few hours spare

    Cheers,
    Dave

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