7 Jun
2002
7 Jun
'02
7:59 p.m.
I took a look at the board I used to use for speed-testing microprocessors and
found that I did buffer the dip switch with a bidirectional buffer. I'm not
sure that's necessary, but if you drive the input side of the dip switches
with the R/W line, it better be an inverting buffer and on my 6502 board, it
actually NANDs the SYNC with R/W to enable the buffer.