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  1. Replies
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    Even when "working," the 4K DRAM board you have...

    Even when "working," the 4K DRAM board you have was still very problematic. It also required a change to the deposit timing one-shot on the front panel PCB. If that board came with your system, that...
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    The board itself doesn’t come with parts, though...

    The board itself doesn’t come with parts, though a seller on eBay offers a parts kit and another seller offers the board fully assembled. I think both provide the several “L” parts that were supplied...
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    Dwight, You are right about A1. Watching the...

    Dwight,

    You are right about A1. Watching the front panel during reset, it looks like A15, A13, A7, and A1 all need to be checked to see if their failure to illuminate is due to front panel/LED...
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    Actually, it looks like you may be in better...

    Actually, it looks like you may be in better shape than you think. The reset operation looks correct, the status lights look correct, and the Examine operation works, as can be seen at 0:31 in the...
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    If you hack in and measure current through the...

    If you hack in and measure current through the LED, you’ll find it’s less than you think - probably in the 20-40ma range.

    Mike
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    If the Yang board uses the 2Kx8 6116 RAMs then it...

    If the Yang board uses the 2Kx8 6116 RAMs then it is a static RAM board which does not use any sort of refresh.

    Mike
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    573

    I like the 64K static RAM boards which use the 2K...

    I like the 64K static RAM boards which use the 2K x 8 static RAM chips. These are low power and very reliable. Most can disable 2K blocks to make memory space holes as required for the Sol-20 and...
  8. Replies
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    Another hobbyist picked up an AID-80F off eBay...

    Another hobbyist picked up an AID-80F off eBay shortly after I got mine (from a friend who worked at Mostek). I was able to make backup disk images of the floppies that came with his system, but...
  9. Replies
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    ...and I’m quite pleased you picked up the...

    ...and I’m quite pleased you picked up the computer so that my work in getting the US version of the system up and running was finally of benefit to another hobbyist!

    Mike
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    You use an existing PC command line utility like...

    You use an existing PC command line utility like HEXBIN to create a .hex file and then the HexToEnt utility here:...
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    Mine is the original 6800 SWTPC computer and...

    Mine is the original 6800 SWTPC computer and early accessories.

    Mike
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    Nice! I’ve got a full SWTPC computer, terminal,...

    Nice! I’ve got a full SWTPC computer, terminal, cassettette interface, and disk drive system I purchased complete and in excellent condition from the original owner a couple of years ago. I have yet...
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    I have a number of 5.25" ten hard sector floppy...

    I have a number of 5.25" ten hard sector floppy disks available for sale. These are the hard sector disks used with North Star, Polymorphic, and Heathkit hard sector controllers. I am selling these...
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    Well that was quick - the boards are here...

    Well that was quick - the boards are here already. $5 total for 30 boards (though shipping was $17). I don't know how they can make a business of this.

    Mike
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    Yeah, I saw this listing on Sunday and let the...

    Yeah, I saw this listing on Sunday and let the seller know it's actually no longer an Altair 4K RAM board. The 4K board was used as a backbone on which the owner built a 32K RAM board (as you...
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    I updated the Mostek page on my website to link...

    I updated the Mostek page on my website to link to your web page. You might have to hit refresh to see the update.

    Thanks!

    Mike
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    Sorry - too late ;) I decided to make the board...

    Sorry - too late ;) I decided to make the board clean and simple with just the 16 and 14 pin sockets to adapt between the OP-80A and the IO4. It’s so cheap that it’s not a big deal to make a...
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    Maggi, I updated the Mostek page on my...

    Maggi,

    I updated the Mostek page on my website with information about and from your system. You may have to hit refresh to see the new page. Thanks for letting me host your material.
    ...
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    I did etch a few PCBs when I was 12 and 13 years...

    I did etch a few PCBs when I was 12 and 13 years old, but that was the last time. For some reason, the quality wasn't great ;)

    Mike
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    I forget what about my project file OSHPark...

    I forget what about my project file OSHPark choked on. I'd have to dig into it again.

    Mike
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    I've had good luck with ALLPCB and PCBCART so...

    I've had good luck with ALLPCB and PCBCART so far. OSHPark doesn't like the output of my old-school PCB tools...

    Mike
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    Corey, Thank you for your generous offer, but...

    Corey,

    Thank you for your generous offer, but yes, I have an OP-80A. For now, I have it temporarily wired into the SSM-IO4 board using a DB-25 patch panel in the middle of two DB-25 ribbons cables...
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    OP-80A Paper Tape Reader

    I'm laying out a small PCB to adapt the pinout of the DIP-16 socket used on the OP-80A paper tape reader to the DIP-14 socket used on the Solid State Music IO4 board. This allows connection of the...
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    You can easily make your own boot disks even on a...

    You can easily make your own boot disks even on a “cold” machine. See “Disk Image Transfer” and “Disk “Images” here:

    http://deramp.com/downloads/polymorphic/poly-8813/software/

    I’d write the...
  25. Solid State Music (SSM) PB1 EPROM Programmer

    I noticed several of the Solid State Music (SSM) PB1 EPROM Programmer boards sold on eBay recently. This prompted me to restore a PB1 I've had sitting around for a year or two.

    As part of the...
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