Image Map Image Map

Search:

Type: Posts; User: Hutch

Search: Search took 0.03 seconds.

  1. Thread: VIC20 Keyboard

    by Hutch
    Replies
    3
    Views
    354

    If only some keys work or respond after repeated...

    If only some keys work or respond after repeated presses, a cleaning will probably help. Springs won't help, they just lift the key back up after you press it.
    If NO keys work at all, it's likely a...
  2. Replies
    47
    Views
    2,321

    Well, I don't have an 80 column PET anymore and...

    Well, I don't have an 80 column PET anymore and that 2001N that dhoelzer is working on is also only 40 columns and non CRTC.

    I have the Tynemouth board but the diags on that only test the first 1K...
  3. Replies
    47
    Views
    2,321

    @daver2, does your PETTEST work in a CRTC PET? I...

    @daver2, does your PETTEST work in a CRTC PET? I managed to find an old 2716 deep in the box of chips, burned and verified but in my 4032 I get no picture. Guessing it's because it doesn't init the...
  4. Replies
    47
    Views
    2,321

    AFAIK, the universal boards weren't made until...

    AFAIK, the universal boards weren't made until the 12" 4000 series. They switch between 4032 and 8032. I thought all of the 2001 series, including the 2001-N were non CRTC units.
  5. Replies
    47
    Views
    2,321

    @daver2 , I wanted to try this also. What kind of...

    @daver2 , I wanted to try this also. What kind of Eprom would you recommend burning this to? Probably need an adapter socket for a 27xx?
  6. Replies
    47
    Views
    2,321

    What I meant to say was that IF the processor was...

    What I meant to say was that IF the processor was not running, I'd expect more random characters on the screen, not large blocks of @.
    That's why I think the vRam may be faulty and the processor is...
  7. Replies
    47
    Views
    2,321

    In my experience, if the video ram is OK and the...

    In my experience, if the video ram is OK and the processor is not running, the video ram would display a more random selection of characters based on the random bit patterns in the ram at power on....
  8. Replies
    47
    Views
    2,321

    Based on that photo of the screen, my first guess...

    Based on that photo of the screen, my first guess would be the video RAM.
    It's mostly @ which is screen code zero which tells me the video circuits are reading mostly zeros from video ram.

    There...
  9. I finished a video on the "generic shoebox-type...

    I finished a video on the "generic shoebox-type tape recorder" equivalent of the "white keys" version of the PET 2001 integrated cassette drive.
    Video Link: https://youtu.be/U92GSChQJKM
    Photos are...
  10. Also, if you haven't seen it, Giacomo Vernoni...

    Also, if you haven't seen it, Giacomo Vernoni created a great booklet on the history of Commodore tape recorders. It's the best reference I've seen on all of the different variants.
    A free PDF...
  11. New info regarding this drive. I recently...

    New info regarding this drive.
    I recently acquired a "white keys" Commodore cassette drive as well as an audio recorder which is mechanically identical.
    I noticed right away that they are also...
  12. Your PETTEST could have come in handy recently. I...

    Your PETTEST could have come in handy recently. I have the Tynemouth board but that only tests Bank 0 and it doesn't give you any details about which bit is bad. Do you sell them or is it...
  13. Starting without the CPU installed wouldn't...

    Starting without the CPU installed wouldn't initialize the CRTC so you wouldn't get a picture at all or you'd get a pinpoint dot in the center of the screen. Right?
    It's a "Fat" 40 so it has a...
  14. Replies
    12
    Views
    1,061

    Why? Is 65c too high? 65 doesn't seem that high...

    Why? Is 65c too high? 65 doesn't seem that high and is a perfectly safe temp for modern chips.
    What's the typical surface temp of the Vic chip?

    Anyone? ...
  15. Replies
    12
    Views
    1,061

    Got a replacement VIC chip and that solved the...

    Got a replacement VIC chip and that solved the problem.

    Does anyone know what the normal operating temp is for the Vic chip? I'm getting ~65c on the surface from an IR temp sensor after it's been...
  16. Replies
    12
    Views
    1,061

    Was able to test it today with a game cartridge....

    Was able to test it today with a game cartridge.
    Even in graphics mode, it's still a screen full of @ with only color changes.

    https://youtu.be/LXKPPzdr15s

    Also, when the text stops working, I...
  17. Replies
    12
    Views
    1,061

    Character rom didn't solve it. Chip pins are...

    Character rom didn't solve it.
    Chip pins are clean and polished.
    Chilling chips doesn't change anything. Maybe bad Vic or bad caps.?
  18. Replies
    12
    Views
    1,061

    So tonight this happend... ...

    So tonight this happend...

    https://youtu.be/LhXbMeMxLZo
    It worked for a while and I was able to try loading some programs from old tapes, but the tapes didn't hold up well over the years.
    Then...
  19. Replies
    12
    Views
    1,061

    poke 36879,8 reveals white @ symbols all over...

    poke 36879,8 reveals white @ symbols all over the screen, just changing colors when text is written.
    for i=7680 to 8191:poke i,42:next doesn't change anything. Still just @ symbols

    No eprom...
  20. Replies
    12
    Views
    1,061

    Vic20 text character problem

    So I pulled out my Vic 20 from the basement storage today for the first time in at least 15 years.

    Purchased in 1982 or '83, It has an original 11.5vac power brick and the two pin power connector...
Results 1 to 20 of 21