29 Jan
2014
29 Jan
'14
10:17 p.m.
On Wed, Jan 29, 2014 at 3:47 PM, Johnny Billquist <bqt at update.uu.se> wrote:
Indeed. So you have the parity option installed in your ASR33. I punched a
bit of paper tape on an ASR33 only two weeks ago, which did not.
Unfortunately I didn't keep the paper, but that one certainly did not have
a parity option installed, so it was pretty obvious what the "default" for
parity is on an ASR33...
I'm tempted to decode it, but don't have the time right now...
I certainly don't doubt you now that the default is mark parity. My friend
owns the Teletype I printed that tape on (I'll get my own one of these
days), but it was *not* used with PDP-8s back in the day, furthering your
point. I think it was hooked up to an IMSAI 8080.
When I talk to my PDPs, I tend to use minicom at 9600 7E2 or 8N2 depending
on if I'm sending ASCII or binary data. 7E2 works fine with every program
I've tried. My notes say that trying 8N2 with CHECKMO II resulted in
garbled characters on the receiving end. Maybe the chess program was
managing to parse the incoming characters alright, but it certainly wasn't
being received by minicom without switching to 7E2.
Perhaps my issues have not been the parity but rather the data
length...more to investigate!
Kyle