6 Oct
2015
6 Oct
'15
10:04 a.m.
Converting between genuine 20mA loop and RS232 is
not that hard.
Yes, but I'm i) lazy, and ii) overwhelmed with other projects! :-) Well, looking at the print (it's in the 11/34 Vol.
2 set that's online), it
looks like it should work plugged in anywhere; the circuit just seems to look
for any BGn/NPG that's been on 'too long', and when it sees one, asserts
SACK.
I can't be bothered to download the prints for just that one board (see above ;-))
But if it behaves as you describe, it would appear that if placed at the remote
end of the bus it could lock the bus by forcing SACK/ asserted (as the M9302 does)
if a grant chain is open, whereas if it is placed at the CPU end it can't.
-tony