29 Aug
2005
29 Aug
'05
12:41 p.m.
... just put up the following:
http://www3.telus.net/~bhilpert/tmp/XC6881.gif
If you need more electrical specs let me know.
Tony Duell wrote:
Does anyone have the pinout for the Motorola MC6881 or MC3449 chip? (16
pin DIL package) (Those 2 devices are equivalents, the ones I have are
marked with both numbers.). From what I can tell, it's a triple
bidirectional bus switch.
They are used in the HP37201 HPIB extender, HP seem to have created
separate data buses for the memroy and I/O chips. I guess this device is
on-topic here, mine dates from 1979, a pair of them allow an HPIB bus to
be fed over various types of serial link, including asynchronous and
synchronous modems.
-tony