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Thread: National Semiconductor SC/MP Low Cost Development System Manual Needed

  1. #1

    Default National Semiconductor SC/MP Low Cost Development System Manual Needed

    Howdy,

    It's my first post here. I've been hunting for one of these systems for a long time - it was my first computer ever and was lost to the ravages of a mom on a cleaning rampage many years ago .. I'm sure some here can sympathize!

    I found one at VCF West and snapped it up!

    Here's a link to a page showing such a system:

    https://collections.museumvictoria.com.au/items/393735

    (Note I'm in California, USA not Australia - they just have some pages about the LCDS).

    I found It seems to work! I have some documentation but I'm missing the main manual for the system - pictured here:

    https://collections.museumvictoria.com.au/items/1136671

    I contacted the museum for a possible copy of the manual but no dice so far.

    Does anyone have a manual they'd part with or make a scan of? Of course I'd be willing to pay a reasonable amount for either.

    Thanks for looking.

    Geoff

  2. #2
    Join Date
    Jan 2015
    Location
    Sydney, Australia
    Posts
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    Hi,

    Yes, I have the manual. It's a part of my SC/MP LCDS, but mine isn't working so I am currently fixing it. Originally the system came with a bunch of manuals, including the system manual, datasheets, circuit diagrams and the EPROM listings. It's not a small manual and, being old, it is fragile and the spine is breaking. It will be a while before I would be able to get it fully scanned.

  3. #3
    Join Date
    Feb 2014
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    Melbourne, Australia
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    Quote Originally Posted by GeoffC View Post
    Howdy,

    It's my first post here. I've been hunting for one of these systems for a long time - it was my first computer ever and was lost to the ravages of a mom on a cleaning rampage many years ago .. I'm sure some here can sympathize!

    I found one at VCF West and snapped it up!

    Here's a link to a page showing such a system:

    https://collections.museumvictoria.com.au/items/393735

    (Note I'm in California, USA not Australia - they just have some pages about the LCDS).

    I found It seems to work! I have some documentation but I'm missing the main manual for the system - pictured here:

    https://collections.museumvictoria.com.au/items/1136671

    I contacted the museum for a possible copy of the manual but no dice so far.

    Does anyone have a manual they'd part with or make a scan of? Of course I'd be willing to pay a reasonable amount for either.

    Thanks for looking.

    Geoff
    Hi Geoff,

    If you have no joy, since I live in Melbourne Australia, I will contact museum and ask can I see and photograph manual.

    Will let you know.

    regards
    David

  4. #4

    Default

    Hi - thanks for replying!

    river I understand about scanning the document taking a while.
    Do you know what's wrong with your LCDS? Let me know if there is anything I can check on mine that might help you.

    David thanks for the offer of checking the museum!

    Geoff

  5. #5

    Default

    Hello river and David

    river I understand about the manual scanning being tricky!
    If there is anything I can check on my LCDS to help you with yours please let me know!
    A question about the manual - does it have the schematic for the CPU card? If so a scan of just that would be very helpful!

    David thanks for your offer! Have you been to that museum before? We have a good computer history museum here in California that I've been to a few times.

    Geoff

  6. #6
    Join Date
    Feb 2014
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    Melbourne, Australia
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    Quote Originally Posted by GeoffC View Post
    Hello river and David

    river I understand about the manual scanning being tricky!
    If there is anything I can check on my LCDS to help you with yours please let me know!
    A question about the manual - does it have the schematic for the CPU card? If so a scan of just that would be very helpful!

    David thanks for your offer! Have you been to that museum before? We have a good computer history museum here in California that I've been to a few times.

    Geoff
    Hi Geoff and river,

    Geoff I have just phoned the MuseumVictoria and asked for access to the documentation, and also possibly the Hardware. Currently, it is in offsite storage so I have to wait for the request to be processed though their system.

    I think it's likely you would get a copy from river quicker.

    river I suggest the simplest way is to get a hold of a digital camera or mobile(cell) Phone camera and just take some pics of the CPU drawing for now.

    Upload them to imgur.com, that free, then post the image link/s here. That's way easier than scanning for now whole manual or even the cct drws. When I do this way as temp way, I take a wide pic of full drawing and depending on camera resolution I will mentally divide drawing and take say 4 closer pics of the image giving a small bit of overlap

  7. #7
    Join Date
    Feb 2014
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    Melbourne, Australia
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    FIY saw this National Semiconductor SC/MP and SC/MP II CPU tester come up on fleebay


    https://www.ebay.com.au/itm/National...:rk:4:razz:f:0

    and link to PDF on how to use this CPU test board is here

    http://www.cpushack.com/wp-content/u...ard_manual.pdf

  8. #8
    Join Date
    Jan 2015
    Location
    Sydney, Australia
    Posts
    30

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    Hi,

    No, I don't know what it's issue is at the moment. I think it could be the ROMs but these are some weird NS chips and do not follow the standard pinouts, so I will plug them into my 8085 Dev system where I have access to the 8085 system bus and a spare chip select, and it has a built in breadboard.... so will connect them up one at a time and check if the code in them is fine, by comparing to the listings from the LCDS Manual. I have also typed in the LCDS code, via the listings, and x-assembled it and verified it is 100% same as the original. I will burn a 2732 to hold all the code and hook this up via one of the J connectors and mount it in the chassis.

    I have seen those CPU testers about, but I have systems that take most of the old CPUs, so I just use one of those systems to validate if a CPU from my parts drawers is operational or not. In regards to SC/MP CPU, I have a few SC/MP I and SC/MP II CPU and I am currently writing a debug/monitor for a homebrew SC/MP system I designed/built. I have one more week before I am on vacation from work (until mid Jan) and will get some pics/images for you from the LCDS manual.

  9. #9
    Join Date
    Dec 2018
    Location
    Melbourne, Australia
    Posts
    1

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    I am new to this forum, and hope some of you can help me with the restoration of an LCDS I have just acquired (ex. ebay) which appears to have been listed by a family clearing out someones collection. Fortunately the recognised that it was a significant piece of history. It comes with 2 memory cards and 2 cpu cards, plus a SC/MP kit with KITBUG rom.

    But it does not have an original set of roms on the LCDS board, and first powerup shows no life in the display or keyboard. So either, the replacement EPROMS are now erased, or they have totally different code in them.

    So I am going to see if I can get the KITBUG rom and one of the CPU cards operating on the LCDS, so I can you use it to interrogate and exercise the the unit. Hopefully this will allow me to examine the ROMS and test the display and keyboard.

    But of particular interest to this thread, I contacted Museums Victoria, and they have supplied me with a complete PDF of the LCDS manual!!

    So I am hoping that someone here who has a working system could supply a complete hex listing of the original ROMS, and I would be happy to share the manual.

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