Hi Leonard.

15-May-03 22:51:03, Leonard Erickson wrote to Roy J. Tellason



 RJT>> Leonard Erickson wrote in a message to All:
 LE>> Digging thru my junk box, I stumbled upon an old Inmac gizmo:
 LE>> SP-64 Serial-To-Parallel Converter and 64K Buffer Product No.
 LE>> 8149-1
 LE>> It's got a coax power jack, and no indication of what voltage
 LE>> polarity it wants.

 RJT>> That's probably easy enough to figure out,  looking at the
 RJT>> inside. Odds are pretty good that there will be a regulator of
 RJT>> some sort in there,  anyway...

 LE> Yeah, but it's built into a box 2 cm thick, 7.5 cm long and 7 cm
 LE> wide. It's got *two* PC boards, with the part sides facing each
 LE> other.

 LE> Ah. It does come apart without too much trouble.

 LE> Would an LM341 be the regulator?

dunno, I was expecting a 780x series regulator

are there max232 chips driving the serial end or is it 1488/1489 chips
the max will work from +5v but the 1488s want about +/- 12v

 LE>> There's also a 8 position DIP switch inside (probably for setting
 LE>> serial parameters).

 RJT>> That could be somewhat more difficult.  

 LE> Nah, just keep changing parameters until something prints. :-)

yeah, only 256 possible combinations :)
if you'ce got an oscilloscope you could maybe read the baud and protocol
using that....

 -=> Bye <=-

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