[BBC-Micro] Configuration EEPROM size

Mark Haysman jumbos.bazzar at btopenworld.com
Sun Oct 31 16:33:19 GMT 2010


> The power supply for my Master Compact isn't working. Can somebody
> run the following code and report the results:
>
> A%=161:X%=255:Y%=50:PRINT ~USR&FFF4
>
> It reads the size of the configuration EEPROM. Documentation says
> it should return Y=size-1, eg 255 for a 256-byte EEPROM. Testing
> on B-Em returns 0 implying no EEPROM present, but then trying to
> change any settings has no effect anyway which could be correct.

I'll do it on a real compact when I clear the testbench (If no-one else gets 
there first), but the origianl chip, PCD8572 is 128x8. If it's fried, you 
can use a more modern 24LC014 by removing R1, and fitting a shorting link in 
place of C2.

Mark. 




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