Re: [Simh] pdp11 - console input with high bit set

> From: Johnny Billquist > Date: Sat, 25 Jul 2020 00:58:08 +0200 > I would have to disagree with that. All older PDP-8 software is > definitely using MARK parity, not EVEN. Both on input and output. > (Sortof annoying if you aren't expecting it.) > The ASR33, as configured by DEC, was

Re: [Simh] pdp11 - console input with high bit set

On 25-Jul-20 13:47, Paul Koning wrote: >> But by the mid to late 70s, i.e. with the glass TTY it started to fall from >> favor. I don't know why, but I would suspect this was because dedicated >> lines started to supplant telephone circuit-based connections and single-bit >> error detect

Re: [Simh] pdp11 - console input with high bit set

> On Jul 24, 2020, at 5:57 PM, Clem Cole wrote: > > ... >> If you set your UART for 8 bits with parity, it would send 11 bits total: >> start, 8 data, parity, stop. > Yep ... you are correct that is exactly how the hardware works. mei culpa. > Although, if we are going to get specific.

Re: [Simh] pdp11 - console input with high bit set

On Friday, July 24, 2020 at 5:42 PM, David Gesswein wrote: > On Sat, Jul 25, 2020 at 01:22:38AM +0200, Johnny Billquist wrote: > > > > > > I thought the high bit setting would be turned off if you used set > > > tti 7b or 8b but never verified. > > > > Which obviously won't help if the software

Re: [Simh] pdp11 - console input with high bit set

On Sat, Jul 25, 2020 at 01:22:38AM +0200, Johnny Billquist wrote: > > > > I thought the high bit setting would be turned off if you used set tti 7b or > > 8b but never verified. > > Which obviously won't help if the software running inside simh then expects > MARK parity... > Correct. That was

Re: [Simh] pdp11 - console input with high bit set

: Simh On Behalf Of Mark Pizzolato - Info Comm Sent: Friday, July 24, 2020 4:34 PM To: Paul Koning ; David Gesswein Cc: Simh@trailing-edge.com Subject: Re: [Simh] pdp11 - console input with high bit set On Friday, July 24, 2020 at 11:36 AM, Paul Koning wrote: > > On Jul 24, 2020, at 2:28 PM, Da

Re: [Simh] pdp11 - console input with high bit set

On Friday, July 24, 2020 at 11:36 AM, Paul Koning wrote: > > On Jul 24, 2020, at 2:28 PM, David Gesswein wrote: > > > > On Fri, Jul 24, 2020 at 06:12:17PM +, Paul Moore wrote: > >> Not helped by not knowing what KSR really means. > >> > > > > Keyboard send receive. A model 33 teletype without

Re: [Simh] pdp11 - console input with high bit set

On 2020-07-24 20:28, David Gesswein wrote: On Fri, Jul 24, 2020 at 06:12:17PM +, Paul Moore wrote: Not helped by not knowing what KSR really means. Keyboard send receive. A model 33 teletype without paper tape. ASR was the model with paper tape, Automatic send receive. DEC used

Re: [Simh] pdp11 - console input with high bit set

On 2020-07-24 19:53, Ethan Dicks wrote: On Fri, Jul 24, 2020 at 1:13 PM Paul Moore wrote: Johnny, I don't know what that means for simh On an xterm session, there may not be a way to do it. If you were running simh from a dumb terminal on a serial port, you could set your terminal to do 7E1

Re: [Simh] pdp11 - console input with high bit set

I would have to disagree with that. All older PDP-8 software is definitely using MARK parity, not EVEN. Both on input and output. (Sortof annoying if you aren't expecting it.) The ASR33, as configured by DEC, was normally also set up with MARK parity, which is probably the reason all software

Re: [Simh] pdp11 - console input with high bit set

lquist *Sent:* Friday, July 24, 2020 1:37:27 AM *To:* Paul Moore ; Simh@trailing-edge.com *Subject:* Re: [Simh] pdp11 - console input with high bit set You need to have your terminal set to MARK parity.    Johnny On 2020-07-24 01:56, Paul Moore wrote: I am trying to run an RK11 diagnostic

Re: [Simh] pdp11 - console input with high bit set

On Fri, Jul 24, 2020 at 4:18 PM Paul Koning wrote: > Parity is something that comes in addition to the data. DEC UARTS (and > many others, I think) > Appendix D of McNamara's book, *a.k.a.* the 40-pin WD1402 and 1402A :-) I once knew it well and at one time had an official WD manual for it (I

Re: [Simh] pdp11 - console input with high bit set

> On Jul 24, 2020, at 3:15 PM, Clem Cole wrote: > > > > On Fri, Jul 24, 2020 at 2:37 PM Paul Koning > wrote: > The right answer would be a tweak to the console emulation in SIMH pdp11. > Mumble... Paul - I'm not so sure. While DEC used MARK a lot, there

Re: [Simh] pdp11 - console input with high bit set

On Fri, Jul 24, 2020 at 3:16 PM Clem Cole wrote: > Anyway, I think the 'right' answer for simh is to ask the user to use a serial > emulation program that can generate any of: 8-bit no parity, 7-bit no parity, > or 7-bits of data plus an 8th parity bit with any of the 4 parity options: > odd, >

Re: [Simh] pdp11 - console input with high bit set

On Fri, Jul 24, 2020 at 2:37 PM Paul Koning wrote: > The right answer would be a tweak to the console emulation in SIMH pdp11. Mumble... Paul - I'm not so sure. While DEC used MARK a lot, there were places that used EVEN parity a lot also on PDP-11's (Lord how, I hated 20 mA current loop ;-)

Re: [Simh] pdp11 - console input with high bit set

> On Jul 24, 2020, at 2:28 PM, David Gesswein wrote: > > On Fri, Jul 24, 2020 at 06:12:17PM +, Paul Moore wrote: >> Not helped by not knowing what KSR really means. >> > > Keyboard send receive. A model 33 teletype without paper tape. > ASR was the model with paper tape, Automatic send

Re: [Simh] pdp11 - console input with high bit set

On Fri, Jul 24, 2020 at 06:12:17PM +, Paul Moore wrote: > Not helped by not knowing what KSR really means. > Keyboard send receive. A model 33 teletype without paper tape. ASR was the model with paper tape, Automatic send receive. DEC used teletype's that generated mark parity. From the

Re: [Simh] pdp11 - console input with high bit set

Ethan Dicks Sent: Friday, July 24, 2020 10:53 AM To: Paul Moore Cc: Simh@trailing-edge.com; Johnny Billquist Subject: Re: [Simh] pdp11 - console input with high bit set On Fri, Jul 24, 2020 at 1:13 PM Paul Moore wrote: > Johnny, I don't know what that means for simh On an xterm session,

Re: [Simh] pdp11 - console input with high bit set

On Fri, Jul 24, 2020 at 1:13 PM Paul Moore wrote: > Johnny, I don't know what that means for simh On an xterm session, there may not be a way to do it. If you were running simh from a dumb terminal on a serial port, you could set your terminal to do 7E1 (even parity), and possibly a matching

Re: [Simh] pdp11 - console input with high bit set

Actually, even parity was more common in the early daze of DEC async.  MARK always sets the high bit - even sets it only to make the total number of 1s even. Quick test: Given that #215 is CR - If the code is looking for #212 for LF, it's mark.  If it's looking for #012, it's even. Note also

Re: [Simh] pdp11 - console input with high bit set

Johnny, I don't know what that means for simh Get Outlook for Android<https://aka.ms/ghei36> From: Johnny Billquist Sent: Friday, July 24, 2020 1:37:27 AM To: Paul Moore ; Simh@trailing-edge.com Subject: Re: [Simh] pdp11 - console input with high bit se

Re: [Simh] pdp11 - console input with high bit set]

PDP-8 has set tti ksr to handle this. Looks like the PDP-11 doesn't. You could implement the same code in PDP-11. Looks like trying to send arbitrary 8 bit data through terminal windows doen't work for most of them. On Thu, Jul 23, 2020 at 11:56:24PM +, Paul Moore wrote: > I am trying to run

Re: [Simh] pdp11 - console input with high bit set

You need to have your terminal set to MARK parity. Johnny On 2020-07-24 01:56, Paul Moore wrote: I am trying to run an RK11 diagnostic and am stuck. The diagnostic asks the user how many drives to test and I can get the input to work Looking at the code, it is looking for digits and then

[Simh] pdp11 - console input with high bit set

I am trying to run an RK11 diagnostic and am stuck. The diagnostic asks the user how many drives to test and I can get the input to work Looking at the code, it is looking for digits and then cr. But it is actually looking for #215, which is 0x8d. Which is CR with the high bit set. (It also