Image Map Image Map

Search:

Type: Posts; User: Fran

Page 1 of 3 1 2 3

Search: Search took 0.01 seconds.

  1. Replies
    100
    Views
    5,338

    Hi Dave This is the diagram to make your own...

    Hi Dave

    This is the diagram to make your own composite video adapter

    56269

    http://www.dasarodesigns.com/product/commodore-pet-video-mixer/

    Following the diagram I made my own composite...
  2. Replies
    100
    Views
    5,338

    One of the keys does not work, pressing it should...

    One of the keys does not work, pressing it should not make contact
    Dwight as you can see in this image with a composite video adapter

    56260
  3. Replies
    423
    Views
    10,797

    Hi These are the correct values with the NOP...

    Hi

    These are the correct values with the NOP GENERATOR, look at my post:
  4. Replies
    100
    Views
    5,338

    Hi Ram 2114 from China have arrived today, ...

    Hi
    Ram 2114 from China have arrived today, surprise, they are 2114-2 instead of 2114
    Original ram 450ns, China ram 200ns

    I have desoldered the ram and placed 2 sockets in its place

    56253...
  5. Replies
    100
    Views
    5,338

    I just remembered that I have a ZX-81 for parts...

    I just remembered that I have a ZX-81 for parts with rams working. Is this ram valid for the pet?

    56138
  6. Replies
    100
    Views
    5,338

    I don't have any eprom programmer but if you tell...

    I don't have any eprom programmer but if you tell me what I need I can buy it.
  7. Replies
    100
    Views
    5,338

    Commodore PET ROM / RAM replacement boards This...

    Commodore PET ROM / RAM replacement boards
    This is a board which plugs into the 6502 CPU socket on something like a Commodore PET and can selectively replace the onboard ROM or RAM. I've been making...
  8. Replies
    100
    Views
    5,338

    If you look at the video (#70) you can see how...

    If you look at the video (#70) you can see how under the garbage are the characters G
    I don't know if this is significant to find the fault
  9. Replies
    100
    Views
    5,338

    http://blog.tynemouthsoftware.co.uk/2015/09/commod...

    http://blog.tynemouthsoftware.co.uk/2015/09/commodore-pet-rom-ram-replacement-boards.html

    I thought you were the Dave of this blog
  10. Replies
    100
    Views
    5,338

    I apologize for my mistake

    I apologize for my mistake
  11. Replies
    100
    Views
    5,338

    Yes, I used your pettest 56126 ...

    Yes, I used your pettest

    56126


    https://youtu.be/QjlOBjpS3sk
  12. Replies
    100
    Views
    5,338

    Whit the replacement boards you cannot test the...

    Whit the replacement boards you cannot test the video ram/rom.

    Years ago I bought spare parts in jammeco, but the shipping costs are very expensive, from China the shipping costs are free.

    One...
  13. Replies
    100
    Views
    5,338

    Hi Dwight / Dave_m I apologize, I did not...

    Hi Dwight / Dave_m

    I apologize, I did not explain myself well, I only tried the system ram, the video ram was not tested since I have no spare parts. Last week I ordered 10 units...
  14. Replies
    100
    Views
    5,338

    I have not desoldered the video ram and I have...

    I have not desoldered the video ram and I have not installed sockets.

    56112
  15. Replies
    100
    Views
    5,338

    It is correct, my scope does not have chopped /...

    It is correct, my scope does not have chopped / alternate modes for inputs.
  16. Replies
    100
    Views
    5,338

    Thank you very much for the explanations, I am...

    Thank you very much for the explanations, I am amazed at your knowledge and light years away from you.
  17. Replies
    100
    Views
    5,338

    Hi Dwight Yes, the values are the same CH1 F5...

    Hi Dwight
    Yes, the values are the same

    CH1 F5 pin-12 and CH2 F7 pin-3, positive and negative

    56101 56102 56103 56104 56105 56106

    CH1 F5 pin-12 and CH2 F8 pin-3, positive and negative
    ...
  18. Replies
    100
    Views
    5,338

    I'm not sure how to do what you tell me. As I...

    I'm not sure how to do what you tell me.
    As I said, my electronic knowledges are limited.

    I have connected the EXT to pin-14, CH1 to pin-1 and CH2 to pin-12, and these are the waves. As you can...
  19. Replies
    100
    Views
    5,338

    CH1 F5-13 and CH2 F5-12 ...

    CH1 F5-13 and CH2 F5-12


    https://youtu.be/I8xiKs2bCiU

    some captures with the single trigger option

    56012 56013 56014 56015
  20. Replies
    100
    Views
    5,338

    My scope have an external trigger input, but I...

    My scope have an external trigger input, but I have only two probes.



    CH1 F5-14 and CH2 F5-12


    https://youtu.be/vLNnk1hkA_4

    some captures with the single trigger option
  21. Replies
    100
    Views
    5,338

    Thanks Dwight, measurements with the NOP...

    Thanks Dwight, measurements with the NOP GENERATOR or only with the 6502?
    What do you mean with a a separate sync input?
    Fran
  22. Replies
    100
    Views
    5,338

    Dwight, how can I verify that the video side is...

    Dwight, how can I verify that the video side is making a sequential address to the video RAM?
    My electronic knowledges are limited :-(
    I apologise for my ignorance.
    Thanks
  23. Replies
    100
    Views
    5,338

    Hi Are these waves correct?

    Hi

    Are these waves correct?
  24. Replies
    100
    Views
    5,338

    These waves are not correct, the probe ground was...

    These waves are not correct, the probe ground was not connected correctly.

    These are the right waves (C3 AB0 IN pin 2 OUT pin 18)

    55871
  25. Replies
    100
    Views
    5,338

    My probes are compensated correctly. CH1 to F6...

    My probes are compensated correctly.

    CH1 to F6 pin-1 (CLK1), CH2 to F6 pin-12 (SA0)

    55832

    CH1 to F6 pin-1 (CLK1), CH2 to F6 pin-4 (SA1)

    55833 55834 55835 55836 55837 55838
Results 1 to 25 of 57
Page 1 of 3 1 2 3