Hi all, I am trying to repair cf2700. Need to say from the beginning that schematic is little different from that one available at HansO site.
The problem is that after reset channel A of 8255 (seems to be) in wrong state (not in output state), each of port A wires has 1 volt. As a consequence, main ROM chip does not get /CS signal at all, thus machine can not properly start.
I also have good cf2700, and it behaves in normal way - just after reset port A gets high state, selecting slot 0 for whole memory space.
I have replaced 8255, removed LS153 which goes just after port A on the schematic (in order to see if its inputs may corrupt signal). ROM image is ok.
What's wrong with bad one? /CS is always low, data clocks, /WR and /RD are always high.
Did I miss anything?
Thanks.

Not the 1st time I've seen that in a service manual from Hans Otten site... he did a great job of putting all these docs online, but it's clearly quantity over quality 
(see missing schematic, or eg. HB-75P service manual to get an idea)