Atari 800 "SUPDUP"

[larsbrinkhoff]

ATLOGO; SUPDUP 1 1981-04-16

Terminal emulator for an Atari 800 located in the Logo lab. Probably written, or derived from code, by @jackpal: "CHAMELEON TTY BY JHP"

KLOTZ; * LOGIN says:

:tctyp soft hei 24 wid 39 +%tosai +%tolid +%tocid full +%tprsc no overwrite
:ttyloc Logo 327

Source code says these terminal types are supported. "SUPAI" should be ITS software TTY codes.

TTABLE: .ADDR   GLASS   ;Glass tty (vanilla CRT)
        .ADDR   SUPAI   ;AI Dial Up
        .ADDR   IMLAC   ;Imlac
        .ADDR   SUPAR   ;Arpa Net Dial up
        .ADDR   VT52    ;VT-52

[larsbrinkhoff]

Compare with this.

https://manualzz.com/doc/19258610/

[atsampson]

JHP's ANTIC interview discusses CHAMELEON starting about 10 minutes in, and describes implementing SUPDUP at 14:29.

[larsbrinkhoff]

Thanks @atsampson. I listened to the entire interview, which was very fun and interesting!

[larsbrinkhoff]

I particularly noted how Palevich's first thesis idea was to write an Atari 400 emulator for a Lisp machine. That's entirely possible now.

[jackpal]

My guess is that the SUPDUP code is a fork and extension of my original CHAMELEON terminal emulator. My guess is that either Leigh Klotz or Patrick Sobolvaro extended CHAMELEON to create SUPDUP. From looking over the source code, I see these changes from what I remember writing in Chameleon: + Using the paddle to scroll left/right. (I only supported using the yellow function keys to do this.) + Emulating SUPAI and IMLAC. (I had already added SUPDUP support to CHAMELEON.) + Removing emulation for ADM-3A. Unfortunately I wasn't very good about keeping in touch with Leigh and Patrick. I didn't even know that they had extended CHAMELEON to create SUPDUP. I would have been totally fine with it, had I known, and I probably would have incorporated at least the paddle-based scrolling feature. (SUPAI and IMLAC emulation were not useful outside of MIT, so I might not have added them.)

…

On Sun, May 9, 2021 at 11:55 PM Lars Brinkhoff ***@***.***> wrote: I particularly noted how Palevich's first thesis idea was to write an Atari 400 emulator for a Lisp machine. That's entirely possible now. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or unsubscribe.

[larsbrinkhoff]

Source file ATLOGO; SUPDUP 1 is now provided, courtesy of the author Jack Palevich (@jackpal).

I will try to have it assembled and run in an Atari 800 emulator at some point.

[larsbrinkhoff]

The source file SUPDUP 1 assembles with no errors on ITS using CROSS with the /M65 switch. The program occupies the address range 6000-6AAF, just 2735 bytes.

[larsbrinkhoff]

Link to thread asking for help how to run this:
https://www.atari-forum.com/viewtopic.php?f=98&t=40607

[larsbrinkhoff]

This has also been blessed by Klotz and Sobalvarro, who would be the most likely to have made the modifications.

[larsbrinkhoff]

I got some help here: https://atariage.com/forums/topic/321931-help-running-atari-800-terminal-emulator-from-mit/

The program now displays the first "splash" screen, but it does not show the next line after four seconds.

[larsbrinkhoff]

The program requires revision A of the Atari OS due to hard-coded addresses.

[larsbrinkhoff]

I better jot down how I got this to work.

• Assembled source code using CROSS with BINARY defined. This makes a small stub entry point at address 600.
• Converted the CROSS output to Atari exectable file format. See Convert binary output from CROSS to an Atari DOS binary file. larsbrinkhoff/pdp10-its-disassembler#86
• Downloaded image files:
  • Atari OS rev "A", NTSC version. (PAL rev "A" works too.)
  • Atari BASIC rev "C".
  • A floppy disk with DOS 2.0S.
• Put the converted binary in the current directory as CHAM.COM.
• Compiled the atari800 emulator off GitHub: https://github.com/atari800/atari800
• Pointed .atari800.cfg to the right image files.
• Ran the emulator like this: atari800 -atari -ntsc -basic -nopatch -rdevice -H1 . dos20s.atr
• Typed DOS to exit BASIC.
• Typed L and then H:CHAM.COM.
• Typed M and then 600.

atari.zip