11 Jun
2006
11 Jun
'06
3:18 p.m.
Found a problem in my IRIS 3k - didn't have a terminator on the IM1 memory bus. I
doubt that this is still available through
retail channels
Gerhard helped quite a lot by taking pictures of the board and giving a description of
where it went, now I need to fab one.
The board looks to be 4-layer (front&back traces with power and ground planes), which
is a bit difficult to do at home. This runs
in a 16MHz 68k system. Would it be possible to fab it using a barely-etched dual sided
board for power/ground planes and running
point-to-point wires for the signals, or is this asking for trouble as far as timing
issues go?
Termination is standard 331/331 resistors.
Scott Quinn