• Please review our updated Terms and Rules here
  • Exhibitor application for VCF West 2022 is now open! If you are interested in exhibiting, please fill out the form here.

daver2's latest activity

  • daver2
    daver2 replied to the thread Cbm 2001 Pet strange boot.
    Good point, I was going to mention that a while ago and forgot. The probes cone with plastic attachments. They cover the GND ring of...
  • daver2
    daver2 replied to the thread Cbm 2001 Pet strange boot.
    Can you video the following signals please and indicate the frequency (if the signals are stable). B2/6. A3/11. A4/1. A3/10. A4/3...
  • daver2
    daver2 replied to the thread Cbm 2001 Pet strange boot.
    They are fine. Dave
  • daver2
    daver2 replied to the thread Cbm 2001 Pet strange boot.
    Yes, You can also check A3/4 and B2/5 at the same time. These are an inverted BA11 and can be tested at the same time. Thanks for...
  • daver2
    daver2 replied to the thread Cbm 2001 Pet strange boot.
    They look fine. I am not sure why your frequency meter is not stable. The oscilloscope trace is rock solid though. You may need to read...
  • daver2
    daver2 replied to the thread Z80 assembly inconsistency.
    I fully agree. Dave
  • daver2
    daver2 replied to the thread Cbm 2001 Pet strange boot.
    Are you reading the frequency from your inbuilt frequency meter or the oscilloscope trace? How is the frequency changing on A6 / UD9...
  • daver2
    daver2 replied to the thread 6502 Assembly Language Question..
    Self-modifying code is the spawn of the devil and should be avoided at all costs! However, if you must do it, you must do it... I...
  • daver2
    daver2 replied to the thread 6502 Assembly Language Question..
    Correct. You either must use page 0 or self modifying code. Those are your only two options I am afraid. Dave
  • daver2
    daver2 replied to the thread Cbm 2001 Pet strange boot.
    Just got back from my business trip... If you go back to post #1,584 I asked you to measure the frequencies. ScottishColin was kind...
  • daver2
    There is a 6502 BASIC memory test somewhere. You can specify the start and finish address. For the SP9000 the start address would be...
  • daver2
    I am looking at your posted photographs and seeing the duplicated text and error messages that are displayed. This is indicative that...
  • daver2
    daver2 replied to the thread Cbm 2001 Pet strange boot.
    I have checked myself, and the firmware for UD9 that has been burnt looks correct to me also. Based on that we are looking at the CPU...
  • daver2
    OK - I understand more now... So, I am not sure what you are using the waterlooMonitor 'p' command for? It looks like you are trying...
  • daver2
    You go into the Waterloo Monitor and type 'p'. You log into your remote machine. What do you then type to perform the load? This is...
Top