Marco, You're looking at 7 bit ASCII with MARK parity. Try using putty ( http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html). Set the correct baud rate and set for 7 bits, 1 stop bit and MARK parity. If you're using the linux version of putty you can only set mark parity from the command line or by editing a saved cfg file (The Mark and Space options are missing from the setting window on linux for some reason). Marc On Tue, May 20, 2014 at 1:25 PM, Marco Rauhut <marco at familie-rauhut.eu>wrote:

Cutecom appears to have support for all the needed options (at least version 0.22 which is what's on this machine done. I prefer minicom myself on a linux box (because it's a terminal application), which also has all the needed settings needed in this case. --Jason On 05/20/2014 05:51 PM, Rob Doyle wrote: > On 5/20/2014 1:25 PM, Marco Rauhut wrote: >> Hello together, >> >> the restoration of my PDP-8 and TU56 going forward. Many PDP 8 machine >> tests are OK. The TU56 come slowly back to life. >> >> My current problem is, that i do not own a ASR33. Or is it no Problem? >> I testet the M8655 with the echo and printer test like in the smal >> computers handbook described. All is working fine. I see readable >> characters in cutecom on my linux desktop. With the cutecom i also send >> the binloader and the testprograms to the PDP8. There i have no >> problems >> too. But... some maindec testsoftware is doing printouts on the >> Teletype >> witch i canot read on cutecom. Exactly the same happens, if i bootstrap >> software witch come on tape with the tapedrive. >> >> Exampe hexdump of the output from software on tape (generated with >> cutecom): >> >> 00000000: 00 ff bf b0 b0 ae b0 b0 20 c0 20 b1 b1 ae b3 b0 >> 00000010: 20 8d 8a aa aa c7 8d 8a 8d 8a 8d 8a 8d 8a c4 c5 >> 00000020: c3 d4 c1 d0 c5 a0 d3 d9 d3 d4 c5 cd a0 c4 d4 a3 >> 00000030: b4 8d 8a 8d 8a c2 c9 ce c1 d2 d9 a0 cd cf ce c9 >> >> Is there an existing software witch can act like a ASR33 for typing and >> printing , or i got to write my own ? >> >> Many thanks to all who help me again and again..... >> >> Marco Rauhut >> >> * Deutsch - erkannt >> * Englisch >> * Deutsch >> >> * Englisch >> * Deutsch >> >> <javascript:void(0);> >> > > The terminal program needs to be configured for 7-bits with MARK parity > and 1 STOP bit to be compatible with a ASR33. > > See URL below for a long discussion: > > https://groups.google.com/forum/#!topic/alt.sys.pdp8/Sj59REEBe2M > > I don't know about cutecom, but Tera Term and putty both support > MARK parity. Some terminal programs don't. > > Rob. > >

Actually you need to be configured with 2 stop bits to be compatible with an ASR33. You actually want to be compatible with your M8655 so check the stop bit jumper on your board to see if it is set to 1 or 2. Anything other than a real ASR33 normally uses 1 stop.

IIRC UK built Creed 5-bit machiens sent 1.5 stop bits. I think some of the Teletypes et al sent things like 1.42 stop bits (but only needed 1 stop bit time on receiving).

Many UART chips will send 1.5 stop bits if set ot 2 stop bits and 5 data bits.

I use minicom or picocom unter Linux. With Minicom I have some problems under OS/8 where it clears the screen after each DIR output... Philipp