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This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

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"PM Sent!" messages (or, how to use the Private Message system)

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New user moderation

New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.

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Other suggestions
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Bringing up my Altair system serial I/O National Multiplex 2SIO questions

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    Bringing up my Altair system serial I/O National Multiplex 2SIO questions

    Hey All,

    Taking my time bringing up my Altair system. It has a REV 0 8080 CPU board, I had to replace a cap on the 32K RAM card and now I can examine memory and deposit into zero page RAM. I have a National Multiplex 2SIO card and I've checked the manual and the 2nd serial port is wired for RS232. I've verified the transmit, receive, ground RTS-CTS DTR-DSR are connected correctly. I'm trying to understand this card more and I see there is a built in monitor, but how do I configure baud, stop bits etc? Also, the manual says C000 but the ROM is labeled F000 and data is in F000 not C000. I just want to examine some memory at this point, I'm ready to connect but a little stumped at the baud rate settings.

    #2
    Hi, I have no useful suggestions - just know that I too have an S100 system (but not a lot of knowledge) and am here awaiting further replies to your question - more for edutainment purposes

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      #3
      Cant you just connect via null modem cable to a PC with Hyperterminal ( or modern equivalent ) and try different settings? My S100 box worked off defaults after setting to 9600baud inWindows device manager - or is the issue that you have no boot ROM and its all entering boot code via front panel etc? I'm probably just embarrassing myself here - I'm sure someone will come along soon....

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        #4
        I found the jumper settings for 8 bit, 1-N so now just playing a guessing game at the baud rate I guess lol. And a guess for the F000 address code is a monitor program. I'm connecting to an old P4 laptop with a serial port using a null modem cable.

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          #5
          Post some pics/video when you get it going. I love these old systems!

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            #6
            You might find it helpful to use an rs232 breakout box to help with debugging. The one I have has LEDs for each line, and allows for patching in different combinations.

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