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  1. Replies
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    >I need a working LCD module for my HX-20. Has...

    >I need a working LCD module for my HX-20. Has anyone got a spare?
    >
    >Thanks
    >JonB

    Probably I have a spare. But I assume you want it tested before shipping?

    Greetings,

    Fred Jan Kraan
  2. Thread: Epson PX-8

    by fjkraan
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    3,293

    Yes, the levels should be ok, but the technology...

    Yes, the levels should be ok, but the technology used is CMOS, so it might not work reliable. Some time ago I wanted to use a 32kByte EEPROM as ROM in a PX-8, and it wouldn't work reliable. This...
  3. Thread: Epson PX-8

    by fjkraan
    Replies
    24
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    3,293

    It might be the EEPROM is too high impedance and...

    It might be the EEPROM is too high impedance and maybe a pullup resistor array on the databus would make it more stable. The probe-effect suggests this.

    I would be interested in the CPU testcode,...
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    On both questions, yes. About the latter, I was...

    On both questions, yes. About the latter, I was able to buy both (reasonably priced) DIN-connectors from an online shop in the U.K., but is seems I cannot find the order information. Or the...
  5. Replies
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    From:...

    From: https://fjkraan.home.xs4all.nl/comp/qx10/qx10.html

    7-pin 8-pin
    monitor QX-10 function wire color (original)
    ------- ----- -------- ----------
    1 ------- 8 ...
  6. The Model 2000 found a new home. Fred Jan

    The Model 2000 found a new home.

    Fred Jan
  7. TRS-80 Model 2000 & color monitor for shipping costs in the Netherlands

    I have a TRS-80 Model 2000 with color monitor, two keyboards and lots of docs that is free for shipping costs. The main component missing is the monitor cable.

    The whole set will fit in two...
  8. Replies
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    Sticky: As HTML:...

    As HTML: https://fjkraan.home.xs4all.nl/comp/zx80/om/
    As PDF: http://electrickery.xs4all.nl/comp/zx80/doc/zx80_om.pdf
  9. copydisk manual

    For a description of the copydisk command:

    http://electrickery.xs4all.nl/comp/px4/doc/duom1.pdf page DUOM0_03_0019.

    Fred Jan
  10. The HX-20 supports an external display out of the...

    The HX-20 supports an external display out of the box. Somewhere I have some info describing a box for the PX8, but I assume it requires an user-BIOS extension to work.

    At one time I had a third...
  11. I always forget even CP/M disk formats are always...

    I always forget even CP/M disk formats are always more complex than I remember. I do know the PX-8/PX-4 can't see the difference between a booted TF-20 and a PF-10. So the PF-10 might use 512 byte...
  12. Hi, The PF-10, as do the QX-10 and TF-20, use...

    Hi,

    The PF-10, as do the QX-10 and TF-20, use 9 sectors per track. The 320 K is because the first four tracks are reserved for the QX-10 or TF-20 BIOS and the last track isn't used at all.
    ...
  13. Replies
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    The mechanical memory worked well enough to use...

    The mechanical memory worked well enough to use it in the relay based Z4. It were the mechanical logic gates that weren't reliable. The Z2, Z3 and Z4 used relay based logic gates.
  14. Replies
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    Mechanical memory (and logic gates)

    Based om some publications, I tried to recreate 3D-printable mechanical components as they could have been implemented in the Zuse Z1, Z2 and Z4 mechanical programmable calculators (computers...
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    Isn't this because Radio Shack numbered the...

    Isn't this because Radio Shack numbered the expansion bus card edge wrong? I remember some interesting debugging some 30 years ago when I made a custom cable to my non-standard floppy disk interface....
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    The LNW80 Team 8088 expansion and probably the...

    The LNW80 Team 8088 expansion and probably the microMerlin are separate 8088 cards which communicated over one or more I/O-ports with a host computer. It might look like the Philips P2000C 8088...
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    > Anyway, congrats on finding a Tandy 2000. Those...

    > Anyway, congrats on finding a Tandy 2000. Those are absolutely collectible.

    Which reminds me; two years ago I scanned the Model 2000 Technical Reference Manual for a page I wanted to make on...
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    It took a while, but chapter 3 of "Das DOS Buch"...

    It took a while, but chapter 3 of "Das DOS Buch" is converted to proper text. Not yet ready for re-assembly, but it is a start.

    See...
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    Hi Rainer, No, I didn't know this book. The...

    Hi Rainer,

    No, I didn't know this book. The SYS0/SYS disassembly project stopped long ago, but it looks like fun to look at the results of someone with more patience.
    It also describes the...
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    Nice to see all this information is kept and...

    Nice to see all this information is kept and maintained. Keep up the good work :-)

    Greetings,

    Fred Jan
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    At one time I reverse engineered the battery...

    At one time I reverse engineered the battery circuit part of the diagram. The C type batteries, akaline or NiCd/NiMh, will not be charged by the PF-10. See...
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    The utilities are probably in some image at...

    The utilities are probably in some image at http://electrickery.xs4all.nl/comp/px4/vfloppy/, but I have no operational PF-10 to make a disk. The tools allow you to retrieve the programs from the...
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    The Owners manual is here:...

    The Owners manual is here:
    http://electrickery.xs4all.nl/comp/divcomp/doc/T3200PCOM.pdf

    These machines are build like tanks, and offer ISA slots in a portable. Not very common.

    Greetings,
    ...
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    Could it be that you have a RAM problem? The...

    Could it be that you have a RAM problem? The screen gives garbage and the machine does not boot. The IPL (assumed to be working from ROM) and serial port work. The video screen is visible and stable,...
  25. You cannot connect a SCSI drive directly. I tried...

    You cannot connect a SCSI drive directly. I tried once, and some component (a diode?) promptly desoldered itself. SCSI has one +5V line between the GND side of the connector, SASI as in the P2000C...
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