Diablo 630 flow control (was Re: THE best find of the weekend!) - test-drb@ccmp.vtda.org

10 Feb 2002

"Steve Robertson" &lt;steven_j_robertson(a)hotmail.com&gt; wrote:
...
  Speaking of Daisy Wheel printers... I prefer to use a
daisy wheel for 
 printing plain text stuff. Currently, I have a DIABLO 630 and am having real 
 difficulty talking to it. Seems like when I try to print anything, I get 
 buffer overruns, the wrong chatracters printed, and all kind of other 
 errors. I have tried every possible combination of comm settings, flow 
 control, etc... to no avail. Does anyone know where I can find the specs for 
 setup and handshaking for this printer. 
RS-232 interface?

I don't recall the details precisely, but I used to be responsible for
a bunch of HP 2601As which were badge-engineered Diablo 630s.  As
shipped by HP they did not do hardware flow control.  There was a
jumper on the top edge of one of the boards inside the printer that
got it to do some sort of hardware flow control though (I think with
it driving pin 20 to indicate whether it could accept data, but I may
be confusing it with other HP serial printers of the day), and this
was described (somewhat oddly) in one of the manuals that came with
the printer.

If I had that manual in front of me I could look it up -- I can almost
see it from 15 years ago, but not quite.

-Frank McConnell