-=> Quoting Jasen Betts to Leonard Erickson <=-

 JB> Hi Leonard.

 JB> 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?

 JB> dunno, I was expecting a 780x series regulator

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

It does have the 1488/1489 chiups. I remember those from when I had it
open, because I recognized them.
 
 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. :-)

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

Nah, that's the nice thing about serial. Just keep trying until you hit
something that works. :-)

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