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Type: Posts; User: hideehoo

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  1. Replies
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    Recreating the Ferguson Big Board

    As part of a recent estate sale, my son and I ended up with two Big Boards, one built, and the other almost completely bare. Stripped the bare one down, took a couple of scans on a large format...
  2. It's alive!

    Ghetto rigged it all up.

    48368

    +21V DC feeding the monitor through the rectifier bridge and rest of the buck converters.

    +16V DC feeding the +12V regulator through the rectifier bridge.
    ...
  3. At VCF Midwest, dragged along some SBC6120 RBC full kits and FD50to34 Adapters

    Everything you need to build one, including the HD1-6120 chip and preprogrammed ROM's and GAL's.

    https://www.retrobrewcomputers.org/doku.php?id=boards:sbc:sbc6120-rbc-edition:start

    The ultimate...
  4. Good point on the +9VDC and the tape drive, was...

    Good point on the +9VDC and the tape drive, was curious why that was sent along on the power schematic, http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/8032/8032029-11.gif

    I...
  5. Converting CBM 8032 PET to switching power supplies

    Picked up a 8032 with bad transformer a while back, my son posted about it here.

    http://www.vcfed.org/forum/showthread.php?55630-Commodore-CBM-8032-Transformer-Problem&highlight=8032

    Primary...
  6. Finally found some time to get mine assembled. ...

    Finally found some time to get mine assembled. Came up right away once I figured out the IDC to DB9 cable was not wired correctly, initially it was just throwing garbage on the terminal screen.
    ...
  7. I also ran across this just after the initial...

    I also ran across this just after the initial list closed and had a couple interested friends so I went ahead and ordered 20 boards and enough parts for 10 kits the other day (gotta get your qty...
  8. Replies
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    I've got a few extra from a batch I built with...

    I've got a few extra from a batch I built with cheap Chinese non-latching connectors. Say $10 and whatever postage is to you? Shoot me a PM if interested.

    34109
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    Finally got around to building a version 1.2...

    Finally got around to building a version 1.2 board I had fabbed awhile back. Is the EEPROM image with the self test program Ian demonstrates in his video (SYSTEM /12288) available for download...
  10. Replies
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    2,282

    Replaced all the electrolytics on the board, now...

    Replaced all the electrolytics on the board, now the brightness at minimum is even higher than before. I used general purpose (instead of low ESR) Nichicons since a little Googling seems to indicate...
  11. Success! After replacing the shorted 4.7uf...

    Success! After replacing the shorted 4.7uf tantalum on the terminal board and repairing another burnt and lifted trace (the -18V supply between pins 1 on P514 and P515) I've got an H: prompt and...
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    I've been using these Panasonic's to replace...

    I've been using these Panasonic's to replace Rifa's in most of my old supplies. Bought a couple dozen of various values when they were less than 10 cents a piece at Newark, but looks like only the...
  13. Thread: .CAS to .DMK?

    by hideehoo
    Replies
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    2,691

    I use PlayCAS to load CAS files directly via a...

    I use PlayCAS to load CAS files directly via a cassette cable driven by the headphone out on a Windows laptop, no need to convert to WAV first. It's at the bottom of the page on Ira's site here
    ...
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    Troubleshooting a Kaypro II power supply

    Picked this up from a neighbor awhile back, didn't power on at the time and the 12V line showed 0V under load, no load it showed almost 12V. Unplugged everything except for the logic and video...
  15. Thanks for the link. All my logic board tants...

    Thanks for the link.

    All my logic board tants that I replaced look like 2.2uf 20V. The ones on the terminal board on the same voltage rails (-18V, +18V) are 4.7uf 50V, including the one that is...
  16. Zenith Z-90 repair log and schematic request

    My son recently acquired a Z-90 that would start-up, but only displays a cursor, no H: prompt. Seems like the CPU board is not starting. A quick tear down and right away here's a problem, blown...
  17. It's a FAT32 card written on a Win7 box, should...

    It's a FAT32 card written on a Win7 box, should be good. The odd part (at least looking at the FreHD docs), is I can never get the red LED to light, even when I power it on with say a NTFS formatted...
  18. Getting closer, got a 254 with the FreHD attached...

    Getting closer, got a 254 with the FreHD attached and powered.

    29905

    Still no boot menu though, tried both a 2GB and 4GB SD card. Does FreHD support SDHC? I'm using the SD-CARD contents...
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    Thanks Larry Page 147 from here,...

    Thanks Larry

    Page 147 from here, http://www.classiccmp.org/cpmarchives/trs80/Library/Manuals/Hardware/Model%204%20Technical%20Reference%20Manual%20(1983)(Tandy%20Corporation).pdf.7z

    Or I have a...
  20. BASIC commands didn't work. Got a 255 from the...

    BASIC commands didn't work. Got a 255 from the second line, and the final line returned a SN Error (tried the whole sequence twice with a power cycle in-between).

    29901

    Keep in mind I have no...
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    Brightness pot is definitely still hooked up. If...

    Brightness pot is definitely still hooked up. If I turn in up from minimum brightness (zero ohms), it gets much, much brighter.
  22. Replies
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    I have the RCA board, not seeing an INT-BRT pot...

    I have the RCA board, not seeing an INT-BRT pot either on the board or in the schematic (Model 4 Technical Reference Manual). The three pots I do see control size and hold. The TCE board does show...
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    Model 4 Screen Brightness Issue

    Once the CRT on my Model 4 warms up, this is what my screen looks like, even at minimum brightness.

    29871

    The front brightness 500K pot tests OK, and it appears minimum brightness happens at...
  24. There's a dump of the my U70 (C) ROM linked at...

    There's a dump of the my U70 (C) ROM linked at the end of post #1 on this thead, and a full dump of my A/B/C ROMs attached to post #9.
  25. Are these GEN1 or GEN2 M4NGA ROMs? Just...

    Are these GEN1 or GEN2 M4NGA ROMs? Just wondering which FreHD patched U70 (C) ROM I should try with this "standard" set. It's going to take me a little while to try these since I now realize I'm out...
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