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  1. Replies
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    I located my spare PB10 87xx adapter board, a...

    I located my spare PB10 87xx adapter board, a picture is attached.

    This board supported 8751's, 7742's, 8748's, 8755's etc. I believe it was a later design than the single 8751 adapter you...
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    Dwight - I do have an 8748 adapter, but no...

    Dwight -

    I do have an 8748 adapter, but no schematic. I think I have a spare, but couldn't easily locate it last night. I'll keep looking, if I do have a spare I certainly don't need two.

    I...
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    I found a print-out of the schematic. The...

    I found a print-out of the schematic. The original file might be on one of the 5.25" disks but I'll have to pull out an older system to look.

    I scanned the printout to...
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    I’m pretty sure that Needham did release the...

    I’m pretty sure that Needham did release the schematic for the PB10. They were a great company to deal with, but sadly no longer in business (the current owners have the name but don’t really...
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    Interesting parts, also equivalent to WS57C49,...

    Interesting parts, also equivalent to WS57C49, very fast. Looks like they were really intended to replace bipolar proms as the pinout Is different.
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    I've never heard of/seen the 68765. Does it...

    I've never heard of/seen the 68765. Does it exist?

    The Needham's EMP30/31 and BK867C will handle the 68764 and 68766.
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    If you have a way to program them, the Motorola...

    If you have a way to program them, the Motorola type 68764 or 68766's are an 8Kx8 EPROM that will directly substitute for many mask ROMs.
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    Look at John Monahan's site www.s100computer.com...

    Look at John Monahan's site www.s100computer.com

    John has released serial, parallel and video cards. Bare cards are available. No composite video, but the Propeller VGA card is easy to build and...
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    Matthew D’Asaro designed a very nice power supply...

    Matthew D’Asaro designed a very nice power supply load. http://www.dasarodesigns.com/product/pc-at-ps2-power-supply-load-tester/

    Well worth building.

    - Gary
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    The other board is an IMSAI PIC-8. If the SD...

    The other board is an IMSAI PIC-8.

    If the SD systems Z8800 is the board with the modification it may be a known update to correct a DMA problem.

    - Gary
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    Actually lots of replies on the S100 Forum ...

    Actually lots of replies on the S100 Forum

    https://groups.google.com/forum/#!forum/s100computers
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    I have a TL866A. The TL866A has the ICSP header...

    I have a TL866A. The TL866A has the ICSP header and TL866CS does not, otherwise the devices are identical.

    Its a cute programmer and for the low price difficult to beat. It also will do some...
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    Sorry, didn't notice your location. The...

    Sorry, didn't notice your location.

    The BK867C is actually made by Elnec in the EU. I believe it's the BeeProg2. Expensive option, but it is currently being manufactured and supported. It does...
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    My BK 867C will program the 82S100, but...

    My BK 867C will program the 82S100, but unfortunately requires a 70-0424 adapter that is $155.

    https://www.dataman.com/module-pld-1.html

    If you provide the adapter I'd be happy to program up...
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    Where in NH? I'm in Amherst... - Gary

    Where in NH? I'm in Amherst...

    - Gary
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    I've had horrible luck with 28C64 and 28C256...

    I've had horrible luck with 28C64 and 28C256 EEPROMs from China. Almost all are blacktopped or ground down and then remarked. The true access time and manufacturer is a crap-shoot.

    If you're...
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    The Zeta is a very slick design and well...

    The Zeta is a very slick design and well supported.

    As Sergey pointed out the Z80 in that kit is counterfeit, and the FDC provided is useless for the Zeta.

    The Z80's from China are all...
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    B&K 867C arrived, and I successfully copied and...

    B&K 867C arrived, and I successfully copied and programmed some Tesla 74S571's last night. It's a very nice programmer and the software is well done.

    - Gary
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    Or even less.... ...

    Or even less....

    http://www.vcfed.org/forum/showthread.php?15907-AT-to-XT-Keyboard-Converter&highlight=at2xt
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    I have replacement parts for the 4 slot...

    I have replacement parts for the 4 slot motherboards (and cpu board) available, see my website at http://www.the-planet.org

    - Gary
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    Figured it was time to "consolidate" my pile of...

    Figured it was time to "consolidate" my pile of various programmers, so bit the bullet and have arranged to purchase a B&K 867C, which is a rebranded Elnec Beeprog2. The same programmer is also sold...
  22. P=V2/R, so 5*5/33 or 0.76 watts Actually I...

    P=V2/R, so 5*5/33 or 0.76 watts

    Actually I would expect the card probably draws more when operating.
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    SRAM card looks like the Digital Research...

    SRAM card looks like the Digital Research Computers card, which is very reliable and easy to adapt. The disk controller looks like a CompuPro Disk1, also well documented.
    The CPU looks like Solid...
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    3D printer .STL files were posted to the...

    3D printer .STL files were posted to the AltairComputerClub group on Yahoo by Eric Dale a while back, and are very nicely done.

    They are mirrored on my website at http://www.the-planet.org

    Nice...
  25. PM sent, thanks!

    PM sent, thanks!
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