30 Jun
2005
30 Jun
'05
10:06 a.m.
If you have the original 40 column board, can you take a look inside and
see if the 5th IC in from the right on the top row of chips (first one
in after the DRAM) is a 74LS158?
All the schematics show this as being a 74LS157 but it's got an LS158 on
my board (which IIRC inverts the outputs).
If the schematics are wrong I'll scribble a note on the copies that I
have!
(I'm trying to trace a fault on my board which is resulting in corrupted
screen memory, and having the schematics disagree with the actual board
is annoying! :-)
cheers
Jules