daver2's latest activity

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...

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...

They are fine. Dave

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...

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...

I fully agree. Dave

Are you reading the frequency from your inbuilt frequency meter or the oscilloscope trace? How is the frequency changing on A6 / UD9...

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...

Correct. You either must use page 0 or self modifying code. Those are your only two options I am afraid. Dave

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...

There is a 6502 BASIC memory test somewhere. You can specify the start and finish address. For the SP9000 the start address would be...

I am looking at your posted photographs and seeing the duplicated text and error messages that are displayed. This is indicative that...

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...

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...

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...