[Techtoolslist] Poss. dumb 9010 query

[Martin White]

Sorry, but i do get rather confused with this thing from time to time :o)

I'm getting a "R/W Error @ F800 BTS 08" when trying to test the ram on one of 
these MCR boards. Am i right in saying that i need to be tracking down a 
problem on the data bus, bit 4, bit 3 if you prefer your numbers to be 0 
based (1000 = 8, therefore, that's bit 0, 1, 2, then 3 or 1, 2, 3, then 4).

And if it were a decode error then that would be the address bus?

I'm assuming all is well with chip selects and r/w signals since it's only 
complaining about bit 08 and not FF?

As an aside, i burnt a set of home burnt roms but the 9010 still can't read 
the things reliably in the MCR sets. It doesn't seem to like anything that's 
in close relation to the CTC i don't think. It's happy enough troubleshooting 
the video staging ram and the background ram, just not the program ram or 
rom :(

I'm using a normal Z80 pod with a Z80A processor in it. I'm guessing from 
reading previous posts that there would be no benefit in trying to blag or 
borrow a Z80AA since someone else was saying that couldn't cope with MCR 
hardware either.

Martin.