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PiDP-8

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Discussion group for the PiDP-8. See the web site for details & documentation.

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Obsolescence, … Warren Young11

8/27/19

Fixing problems - a how-to

On Monday, August 26, 2019 at 3:30:17 PM UTC-6, Obsolescence wrote: that whole procedure needs to be

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Fixing problems - a how-to

On Monday, August 26, 2019 at 3:30:17 PM UTC-6, Obsolescence wrote: that whole procedure needs to be

8/27/19

ggrinton, Geoff Shearer2

12/17/25

Sing_Step selection of OS fails

I can confirm this behavior. Would love a fix if possible, or instructions about what I am doing

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Sing_Step selection of OS fails

I can confirm this behavior. Would love a fix if possible, or instructions about what I am doing

12/17/25

Rick Adams, AndyB3

12/16/25

Well, I know a little more now, via some searching and experimentation. If you load a program with

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Well, I know a little more now, via some searching and experimentation. If you load a program with

12/16/25

Sven Moritz Hallberg, … Sven M. Hallberg4

12/3/25

Inverting the deposit switch in software

William Cattey on Sun, Nov 09 2025: > I've done a build with the invert deposit logic enabled

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Inverting the deposit switch in software

William Cattey on Sun, Nov 09 2025: > I've done a build with the invert deposit logic enabled

12/3/25

William Cattey, … Ian Schofield27

11/11/25

cycle-accurate emulation revisited.

Hi all again, Apologies. This app has been a bit of a moving target as minor changes have accumulated

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cycle-accurate emulation revisited.

Hi all again, Apologies. This app has been a bit of a moving target as minor changes have accumulated

11/11/25

Mike Katz, … Ian Schofield4

11/11/25

Line input routine

Hi All, A teletype input routine can become very involved depending on the application. In the first

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Line input routine

Hi All, A teletype input routine can become very involved depending on the application. In the first

11/11/25

David Rosengrant, … AndyB4

11/6/25

an essential addition to any living room.... :D Andy On Monday, November 3, 2025 at 7:52:12 PM UTC-5

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an essential addition to any living room.... :D Andy On Monday, November 3, 2025 at 7:52:12 PM UTC-5

11/6/25

10/17/25

Runs fine on RPI-3 using PI OS Trixie 32bit

Tonight I updated my Pidp-8 to use the latest 32bit Trixie Lite PI OS. Also wanted to try out

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Runs fine on RPI-3 using PI OS Trixie 32bit

Tonight I updated my Pidp-8 to use the latest 32bit Trixie Lite PI OS. Also wanted to try out

10/17/25

Rick Adams, … Steve Tockey19

10/14/25

TSS8 patch area(s)

Just some possible observations regarding reducing in size ... One fairly obvious thing would be to

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TSS8 patch area(s)

Just some possible observations regarding reducing in size ... One fairly obvious thing would be to

10/14/25

William Cattey4

10/10/25

Who has a PAL-8 pointy hat?

I found an answer to my question #2. It was complicated by the presence of XLIST in 8NFIO already.

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Who has a PAL-8 pointy hat?

I found an answer to my question #2. It was complicated by the presence of XLIST in 8NFIO already.

10/10/25

William Cattey, Vincent Slyngstad10

10/6/25

Non-EAE support in U/W FOCAL. A mostly not yet working prototype.

The code in DECUS 8-436 was most helpful. Their DVI emulation was smaller than mine and mostly

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Non-EAE support in U/W FOCAL. A mostly not yet working prototype.

The code in DECUS 8-436 was most helpful. Their DVI emulation was smaller than mine and mostly

10/6/25

Paul R. Bernard, … Rick Murphy5

9/29/25

OS/8 Fortran IV frustration

Yup, typo. should be WRITE(4,30). -Rick On Mon, Sep 29, 2025 at 11:31 AM timr...@gmail.com <

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OS/8 Fortran IV frustration

Yup, typo. should be WRITE(4,30). -Rick On Mon, Sep 29, 2025 at 11:31 AM timr...@gmail.com <

9/29/25

Rick Adams, timr...@gmail.com4

9/28/25

Altering TSS8 idle task

Ok. That's true. But most of us were not allowed to patch it as it was running 24/7 except for

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Altering TSS8 idle task

Ok. That's true. But most of us were not allowed to patch it as it was running 24/7 except for

9/28/25

albinia hollyman, … William Cattey23

9/28/25

autoboot PiDP-8 user program ?

Hi Steve, I don't know why, but Google Groups sent some of your replies for moderation. As soon

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autoboot PiDP-8 user program ?

Hi Steve, I don't know why, but Google Groups sent some of your replies for moderation. As soon

9/28/25

9/18/25

Re: [pidp8] Digest for pidp-8@googlegroups.com - 2 updates in 1 topic

I put the OP's full question into perplexity.ai. I never asked it to write code before. The

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Re: [pidp8] Digest for pidp-8@googlegroups.com - 2 updates in 1 topic

I put the OP's full question into perplexity.ai. I never asked it to write code before. The

9/18/25

Mike Katz, Steve Tockey2

9/9/25

How to get binary output for TTIX/TTOX

FWIW, my understanding is that the settings on TTIX are mirrored for TTOX. Setting TTOX to 8B should

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How to get binary output for TTIX/TTOX

FWIW, my understanding is that the settings on TTIX are mirrored for TTOX. Setting TTOX to 8B should

9/9/25

Mike Katz, Steve Tockey2

9/9/25

Setting TTIX to be 8 Bits for output

Hi Mike, I'm not sure this is going to be of any help, but ... Seems that the latest

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Setting TTIX to be 8 Bits for output

Hi Mike, I'm not sure this is going to be of any help, but ... Seems that the latest

9/9/25

Steven Mason, … Warren Young19

8/20/25

THROTTLE for the PIDP8i on a Raspberry PI 4.

Well that certainly explains things. I will go back in a look much closer. Still trying to learn so

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THROTTLE for the PIDP8i on a Raspberry PI 4.

Well that certainly explains things. I will go back in a look much closer. Still trying to learn so

8/20/25

Steven Mason, … Clem Cole4

8/17/25

Texas Instruments Silent 700 Data Terminal Model 707

This is why I say, get one of the better (Prolific or FTCI) based USB to RS-232C converters. They are

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Texas Instruments Silent 700 Data Terminal Model 707

This is why I say, get one of the better (Prolific or FTCI) based USB to RS-232C converters. They are

8/17/25

Mike Katz, … timr...@gmail.com4

8/4/25

Updated: Using TTOX with a USB USB Serial Port

This is what I too was thinking. But was not sure. Good to know. On Monday, August 4, 2025 at 11:05:

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Updated: Using TTOX with a USB USB Serial Port

This is what I too was thinking. But was not sure. Good to know. On Monday, August 4, 2025 at 11:05:

8/4/25

8/2/25

Using TTOX with a USB USB Serial Port

According to the documentation to use a USB serial port adapter for output on a port other than 03/04

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Using TTOX with a USB USB Serial Port

According to the documentation to use a USB serial port adapter for output on a port other than 03/04

8/2/25

Steven Mason, … Steve Tockey6

6/30/25

Looking for a Nice Demo Program

And here's a version of KAB (one dimensional Pong) source code that should be read-able on a Mac

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Looking for a Nice Demo Program

And here's a version of KAB (one dimensional Pong) source code that should be read-able on a Mac

6/30/25

Rick Adams, … timr...@gmail.com4

6/30/25

"Gripe" program usage w/ TSS8

I think Gripe came about in 8.24? Our system ran 8.22b for most of my time there. About a month

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"Gripe" program usage w/ TSS8

I think Gripe came about in 8.24? Our system ran 8.22b for most of my time there. About a month

6/30/25

timr...@gmail.com2

6/30/25

Serial terminal not doing line feeds at end of line

Never mind. It was me not having set the right parity on the terminal. All works great now. I had it

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Serial terminal not doing line feeds at end of line

Never mind. It was me not having set the right parity on the terminal. All works great now. I had it

6/30/25

Mike Katz, … DR19

6/25/25

PiDP-8/I connected to a real Teletype Model 33 ASR (ASR-33)

The sound and smell of a TT is magical to me. The first real connection with a computer. The U's

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PiDP-8/I connected to a real Teletype Model 33 ASR (ASR-33)

The sound and smell of a TT is magical to me. The first real connection with a computer. The U's

6/25/25

Joe Giliberti, timr...@gmail.com2

6/22/25

New user here - was booting to OS/8 but now it hangs

How did you shut down OS/8 and Simh? A power off may have corrupted your SD card if something was

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New user here - was booting to OS/8 but now it hangs

How did you shut down OS/8 and Simh? A power off may have corrupted your SD card if something was

6/22/25

Steven Mason, Warren Young3

6/21/25

New PIDP-8i Owner

Thank you for the help and the Basic tutorial. On Friday, June 20, 2025 at 3:22:45 PM UTC-7 tange...@

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New PIDP-8i Owner

Thank you for the help and the Basic tutorial. On Friday, June 20, 2025 at 3:22:45 PM UTC-7 tange...@

6/21/25

Mike Katz, … Vincent Slyngstad4

6/16/25

Good games to play on an ASR-33

You might find these relevant: https://so-much-stuff.com/pdp8/software/decus.php#decus-basic8-1 https

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Good games to play on an ASR-33

You might find these relevant: https://so-much-stuff.com/pdp8/software/decus.php#decus-basic8-1 https

6/16/25

Bobby Ess, … Peter Long5

6/14/25

High CPU consumption by pidp8i process

The plot thickens. After running for the better part of the day, it is now at 4.9%. On Saturday, June

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High CPU consumption by pidp8i process

The plot thickens. After running for the better part of the day, it is now at 4.9%. On Saturday, June

6/14/25

Mike Katz, Steve Tockey3

6/4/25

Teletype ASR-33 questions and needs

I can't remember all of the gory details but ASR-33 paper tape readers require a special mod to

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Teletype ASR-33 questions and needs

I can't remember all of the gory details but ASR-33 paper tape readers require a special mod to

6/4/25

5/8/25

ASR-33 Roll Paper and Paper Tape needed

I will soon receive an ASR-33 and I will need roll paper, 1" rolled (preferably oiled) paper

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ASR-33 Roll Paper and Paper Tape needed

I will soon receive an ASR-33 and I will need roll paper, 1" rolled (preferably oiled) paper

5/8/25

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