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Thread: Heathkit H8

  1. #1
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    Default Heathkit H8

    At the non-profit I volunteer for, we have a donated Heathkit H8 system, with boxes of documentation, software, and additional cards (including an extender card). When I get a chance, I'll go through and document what we have.

    Is there anyone in the Reno, NV or northern California area that would be interested in purchasing a system such as this?

    I know there is the main computer, diskette drives, and what looks like a terminal, all Heathkit. Working status is unknown, but all of the original documentation / schematics / assembly instructions are there.

    If I were into early CP/M computers, I'd be interested myself. There are a few hard sector but mostly soft sector 5.25" diskettes, and one box of 8" disks. And a few cassette tapes, and a cassette interface.

  2. #2

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    You could also try the Google group sebhc@googlegroups.com, there are a lot of H8 enthusiasts on the list.

  3. #3
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    Quote Originally Posted by HoJoPo View Post
    If I were into early CP/M computers, I'd be interested myself. There are a few hard sector but mostly soft sector 5.25" diskettes, and one box of 8" disks. And a few cassette tapes, and a cassette interface.
    I believe the H8 is a PDP-8 compatible machine, so it wouldn't run CP/M. You might be thinking of the H89?

    -ken

  4. #4
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    Nope--you're confusing it with the H11, which is an LSI-11 machine. The H8 is an 8080 box.

  5. #5

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    The H8 Does require a modification to run CP/M because CP/M requires ram at 100H. The Heathkit usually comes with ROM at that locations. One needs to make it so that it maps the ROM out after booting. It is a standard modification though, and commonly done but does require a change of the PAL used for memory decoding.
    For those that want the speed or Z80 compatibility, there is a Z80 processor board as well but true CP/M code should run on a 8080.
    Dwight

  6. #6
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    Quote Originally Posted by Chuck(G) View Post
    Nope--you're confusing it with the H11, which is an LSI-11 machine. The H8 is an 8080 box.
    My father had an H11 so I am well acquainted with that one, but for some reason I have believed that the H8 was a PDP-8 clone for the past 30+ years. I'm not really sure how this happened.

    Anyway, now I know. Thanks for the correction.

  7. #7
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    It includes the H8 computer, H14 dot matrix printer, H17 floppy drives, H19 terminal, Heath-Zenith color monitor, HA-8-3 color graphics / sound / joystick board (with manuals and software), and Smith-Carona TP-I daisywheel printer with tractor feed. The H8, H17 and H19 include the original dust covers, in good condition.

    The system includes an H8 computer with HA-8-6 Z80 CPU, 64k RAM (I didn't remove it but there are 4 banks of 8 memory chips), floppy controller and H8-4 four port serial. Spare cards include two H8-16 16k Static RAM, 85-1938-1 Intel 8080 CPU, H8-7 breadboard, Mullen H-8 extender, H8-10 wire wrap prototyping card, H8-5 Serial I/O, 85-2521 card (double sided floppy?) and HA-8-3 color graphics.

    There's an unpopulated / unbuilt 85-196-1 board, 85-2026-1 Serial I/O card and a mystery board with an EPROM on it.

    There's also a TV typewriter board, with empty sockets, but otherwise built. It includes the documentation and original December 1977 receipt from the Byte Shop III in San Jose, CA.

    On cassette it includes B.H. BASIC, BUG8, TED-8 and HASL-8 on one tape, Heath Users group 885-1028, 890-3-3 and 890-4-3 tapes.

    There are original Heath/Zenith CPM 2.2 disks, Graph-Pac-II software for MBASIC and PASCAL MT+ on CP/M, HDOS with device drivers and software tools, Supercalc, and HDOS/CPM converter, Heathkit User's Group H8 color graphic software for HDOS, and Heath/Zenith Microsoft Basic-80-CP/M. There is EDIT19 line editor and VD.DVD/SPOOLER on disk, and a number of working copies on disk. Most of these 5.25" disks are hard sectored 10 sector disks.

    I didn't realize this included the color monitor and color graphics card, all told there are nine boxes in this lot, some quite large. None of the boxes are setup for shipping, as they are not original boxes.

    Everything is clean and in good shape. All documentation / manuals appear to be present, including the service manual for the color monitor. We haven't tried to power anything on, as we don't want to damage anything due to shorted caps.

    I think this lot is worth at least $1000, what are your thoughts?

  8. #8
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    Here's the link to my Google drive folder with 47 pictures of the system, cards, manuals and software: https://drive.google.com/open?id=1db...yaimfUEIzdLTvg

    I resized them to 50% of original so they're only about 1.2 to 1.5 megabytes each if you want to download them.

    -Howard

  9. #9
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    The H8 system has been sold. We do still have the TV Typewriter which will be going up for sale at some point.

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