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  • snuci's Avatar
    October 15th, 2017, 08:54 AM
    Thanks for the extra warning Mike. I have been doing that as it's an optional ROM. I have another project for today but I'll get back to this in...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 14th, 2017, 02:17 PM
    I checked the ROM sockets and they are fine. I also replaced UD7 and UD6 chips with newly programmed ones just in case but no luck. I did find a...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 14th, 2017, 11:04 AM
    I think my next move is to pull out the board and check the ROM sockets (as KC9UDX suggested). I don't know the order of things but it looks like...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 14th, 2017, 10:55 AM
    Ok, I'll look to see if there is a ROM for memory testing but I thought maybe the screen of "g"s was an indication of good memory? I looked around...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 14th, 2017, 10:09 AM
    Agreed. I forgot that Frank mentioned that. Well, I see two screens alternating when I run that ROM. A screen full of arranged characters in...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 14th, 2017, 05:54 AM
    One question: When I compare the ROMs on Zimmer's site, I see a difference only in the last byte. Both 901465-01 and 901465-02 end if FF but the...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 14th, 2017, 05:08 AM
    I have: - GQ-4X (for normal stuff) - ME2700 (it handles TMS2532A chips, no problem) - ME1702/A - (still haven't finished putting it together for...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 14th, 2017, 03:42 AM
    Further to this, I believe pin 1 on the kernal ROM was detached but still in the socket (I can't really tell). There were the very odd time that...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 14th, 2017, 02:32 AM
    I had a similar concern as on first glance, I thought the ROMs might be out of order. However, I looked up the ROM placement on the schematic to be...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 13th, 2017, 03:20 PM
    Okay, so I removed the PIA, VIA and replaced the 6502, same output. I don't recall if a 6522 or 6520 had a very slightly different pattern but it wa...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 13th, 2017, 03:30 AM
    Following this annotated board, I will see if I can swap C5, C6 and C7. I'll see if I have a working PET with socketted chips that I can swap with...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 13th, 2017, 03:17 AM
    That makes total sense. Out of curiosity, I will see if I can measure the voltage on the S100 slot (I should have an S100 breakout board somewhere)...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 12th, 2017, 02:34 PM
    I checked the 320349 schematic because the 320351 schematic wasn't available. As such, I only checked J10 and J11 and they both have the correct...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 12th, 2017, 08:27 AM
    Did you describe the system as "working" in the auction? If not, I don't think it is reasonable for the buyer to expect it to work.
    5 replies | 227 view(s)
  • snuci's Avatar
    October 11th, 2017, 09:40 AM
    Yes, we fixed one of my other 2001-8's in the past here: ...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 11th, 2017, 08:49 AM
    Hi Dave, I will check power first according to the schematics. I'll have to do a little research on how to check the reset, clock and interrupt...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 11th, 2017, 03:13 AM
    Here's a picture of the original PET motherboard taken from http://www.dasarodesigns.com/wp-content/uploads/2014/07/PET2001BoardLabeled.jpg (I am...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 10th, 2017, 04:05 PM
    I was finally able to acquire a blue surround/blue label PET 2001. It has a couple of interesting mods including an upgraded (I think) 320351 16k...
    41 replies | 928 view(s)
  • snuci's Avatar
    October 6th, 2017, 03:01 PM
    snuci replied to a thread Early Sol-20 Restore in S-100
    You'll have to replace the foam pads within the Keytronic brand keyboard.
    14 replies | 518 view(s)
  • snuci's Avatar
    October 6th, 2017, 02:42 PM
    snuci replied to a thread Early Sol-20 Restore in S-100
    That is great. Have any full pics of the Sol-20?
    14 replies | 518 view(s)
  • snuci's Avatar
    September 30th, 2017, 01:51 PM
    After taking it apart again and checking it over, I couldn't find any visible issues. There are two fuses (one on the power supply and one on the...
    13 replies | 644 view(s)
  • snuci's Avatar
    September 28th, 2017, 02:51 PM
    Well, I screwed it up. I made a floppy by converting an IMD file to Kryoflux and used he Kryoflux. My set up couldn't write the TRS-80 model 4...
    13 replies | 644 view(s)
  • snuci's Avatar
    September 28th, 2017, 10:40 AM
    Should be one of these. https://archive.org/stream/DTCA2DOC-223_repair_IIe_1989#page/n53/mode/1up Druid6900, know which one? I found this...
    18 replies | 770 view(s)
  • snuci's Avatar
    September 28th, 2017, 10:11 AM
    This is not an easy subject. I bought one key cap I was missing on a Canon Cat. I was happy to find it but it meant that someone was parting...
    18 replies | 770 view(s)
  • snuci's Avatar
    September 27th, 2017, 03:42 PM
    Well, I tried and I get 80 columns with a bottom half screen of garbage characters. I was able to do "Hello World" in a loop but it was not a...
    13 replies | 644 view(s)
  • snuci's Avatar
    September 27th, 2017, 02:53 PM
    Thank you. after hitting a few keys, I got a "Memory size?" prompt then "Radio Shack Model III BASIC". Seems a little abnormal for a model 4 but I...
    13 replies | 644 view(s)
  • snuci's Avatar
    September 27th, 2017, 01:19 PM
    Well, go the filter caps replaced. Turned it on for the first time and was greeted with nothing but a lower drive disk seek. Then that turns off. ...
    13 replies | 644 view(s)
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About snuci

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About snuci
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Vintage computer collector and maintainer of http://vintagecomputer.ca
Location:
Richmond Hill, Ontario, Canada

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