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  • dfnr2's Avatar
    April 15th, 2019, 12:49 PM
    The Class X RIFA safety cap in the Astec power supply fails short and will prevent startup. However, the supply will function normally when the cap...
    17 replies | 1893 view(s)
  • mrcity's Avatar
    April 1st, 2019, 08:10 PM
    I just sent a link to a zipped copy of the installed directory from my Tandy via PM. I wasn't able to find the original installation media, but...
    7 replies | 484 view(s)
  • dfnr2's Avatar
    March 31st, 2019, 07:36 AM
    dfnr2 replied to a thread PET 2001-4 restoration in Commodore
    Thanks for the correction. I apologize--I am not very familiar with the PET machines. That would make sense though, since Signetics did make 2316...
    20 replies | 1082 view(s)
  • dfnr2's Avatar
    March 31st, 2019, 02:37 AM
    dfnr2 replied to a thread PET 2001-4 restoration in Commodore
    These are the upgrade ROMs in the machine. Since the original ROM set had 8 ROMS, and only 4 are installed now, what is the difference? Should more...
    20 replies | 1082 view(s)
  • dfnr2's Avatar
    March 31st, 2019, 02:20 AM
    dfnr2 replied to a thread PET 2001-4 restoration in Commodore
    Here are the "before" photos. These show the machine booting up. The pyramid-shaped case is a fitting tomb for several mummified lizards. The...
    20 replies | 1082 view(s)
  • dfnr2's Avatar
    March 30th, 2019, 02:36 PM
    dfnr2 replied to a thread PET 2001-4 restoration in Commodore
    Here's the original ROM set: They are 6540's. The whole set seems to be designated 901447-xx, which looks like a Commodore internal part...
    20 replies | 1082 view(s)
  • dfnr2's Avatar
    March 29th, 2019, 08:08 AM
    dfnr2 replied to a thread PET 2001-4 restoration in Commodore
    I've already repaired the power supply from the Apple II, just before a shelf broke and a bunch of heavy computers fell on the Apple II. The Apple...
    20 replies | 1082 view(s)
  • dfnr2's Avatar
    March 29th, 2019, 08:02 AM
    dfnr2 replied to a thread PET 2001-4 restoration in Commodore
    I do have some photos, and will try to post them this weekend. I got this and a (nonworking) Apple II+ from a local gentleman who wanted to find a...
    20 replies | 1082 view(s)
  • dfnr2's Avatar
    March 29th, 2019, 07:51 AM
    dfnr2 replied to a thread PET 2001-4 restoration in Commodore
    Perhaps that's what happened. If that's the case, I will not feel too bad about trying to bend the mounts (on the case) a little to line up all the...
    20 replies | 1082 view(s)
  • dfnr2's Avatar
    March 28th, 2019, 09:50 PM
    dfnr2 started a thread PET 2001-4 restoration in Commodore
    I recently picked up a PET 2001-4 in pretty rough shape. I am in the process of restoring it. I have some pics of the restoration in progress and...
    20 replies | 1082 view(s)
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About dfnr2

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About dfnr2
Biography:
First learned on a Xerox Sigma 9 and Memphis State, was given a 6809 chip in 1978 and built a 6809 sbc, and bought an OSI C2-4P used in 78 or 79. Currently own multiple OSI's, HP calcs and desktops, Apple IIe and IIgs, C64, Sol-20, IMSAI 8080, Several ELF's and more. Need to find the time to get to all of it!
Location:
Dallas, TX
Interests:
OSI, HP calcs & computers, Apple, PET, S100/IMSAI/Sol, 1802-ELF derivatives...Love it all!

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