8-bit acorn hardware • BBC B issues

Hi
Hope you all well. I have come across a few BBC’s I have now only 1 left to fix which is a continuous beep. I have scoped out the clock and all is good the reset goes high and low when I press the break key

I have checked all the voltage. Moving the S25 makes no difference

I was then browsing your forum and came across a Rom file for a diag Rom so o flashed this and booted the bbc

It now displayed although garbled I could not see the frogger screen.

I then moved the s25 south still the same image. Next I removed s25 and low and behold the frogger image showed so I presume this means the power bank is faulty

I also read some one saying that they can tell what chip is faulty from the frogger screen. I looked for instructions on this but could not find any. I will include a picture of this screen incase anyone can help but if they can point me somewhere that gives the instructions on how to obtain the info from the frogger screen.

The reason I want this machine fixing is to fit a 6800 cumana cpu expansion I have that runs OS9

Any help thanks in advance

Statistics: Posted by Sasquatchuk — Sun Sep 08, 2024 7:45 pm

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