exorsim6801

This is a fork of Joe H. Allen's Exorsim project ( https://github.com/jhallen/exorsim ) to simulate Motorola's Exorciser development system for the 8-bit 6800 MPU. I am working on it here to add the additional instructions from the 6801 instruction set, just because I want something I can conveniently use to work on 6801 code.

(I don't know of any actual hardware that used a 6801 in an Exorciser system other than some highly customized systems some of my brother's coworkers put together as one-off personal projects. -- 3 Sept 2022 -- there were also official 6801 modules from Motorola for using the Exorciser to develop 6801 applications, but I don't know anything about them.)

As of 19 November, the 6801 model (S parameters) fig-Forth assembles and runs well enough to run an old calendar program I put together for a (fictional) planet known as Xhilr: https://osdn.net/downloads/scmarchive/u/reiisi/git/xhilr_calendar/c9/ca/xhilr_calendar-c9ca731.tar.gz/

As of 22 November, I have a command-line switch to enable the 6801 additions, and the assembler and unassembler are somewhat usable. I do not have fact files set up for the fig-Forth model, nor do I have the fig-Forth model interfaced to the disk drive simulation, yet. I'm planning to get back to that in a few weeks or years. Right now I need to use it for the 6800 and 6801 implementations of my common run-time libraries, which are still (3 Sept 2022) in suspended animation.

3 September 2022: I have been getting VTL-2 (Very Tiny Language) running on this simulator, and also on the XRoar MC-10 emulator, and in the process discovered the most embarrassing thing possible. Well, not quite that embarrassing, but embarrassing enough, especially after writing my blog post about software differences between the 6800 and the 6801: https://joels-programming-fun.blogspot.com/2022/08/software-differences-between-6800-and-6801-6803.html . My code here for the 6801 version of CPX failed to set C (and perhaps other condition codes). That is now (I hope) fixed.

Compiling exorsim6801 is the same as exorsim, just cd into the directory with the source code, and make clean and make. Run it with ./exor and ./unasm, etc., if you don't want to go to the trouble of putting the binaries in your executable path.

Running fig-Forth: For the time being, use my asm68c ( https://sourceforge.net/projects/asm68c/ ) to assemble either the 6800 or 6801 model. It outputs an S1/S9 file with a .x extension. Pull that up in a text editor, select-all, and copy. Run exorsim with

./exor -x"

or

./exor -x --6801

At the EXBUG prompt, hit ctrl-c, and it will drop you into the debugger, with a long listing of the trace record. Ignore that for now. Or you can type "help" for the commands, as it tells you.

At the % prompt, hit "l" (ell) and enter, and it will let you paste the S1/S9 file in. When it stops loading, hit enter one more time, to get it to register the start address. It will tell you what it set PC to, and wait. Hit ctrl-C again to get back to the % prompt. At the % prompt now, type "c" (or "c <start-address>") to execute the code pasted in.

I need to work on the fig-Forth's startup, but for now it gives you a screen full of

"OK "

lines, then waits for input. Hit return twice before you try to enter Forth code in. (As I say, I need to work on the start-up.) Remember, the only way to save and load Forth code for now is by copy/paste. Which means you'll have to scrub it of the Forth interpreter's responses to your code when you copy back out and paste your working code back into a text editor. Clumsy, yes, but that's how it is for now.

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Motorola M6800 (6800) Exorciser / SWTPC emulator plus 6801 instruction set emulation

Release Files

Recent Commits

Rev.	日時	作者	メッセージ RSS
92ef8a29	2022-09-03 00:57:21	Joel Matthew Rees	Fixing the embarrassing CPX bug -- C flag, etc.
b083fd00	2020-11-22 22:37:11	Joel Matthew Rees	6801 additions and command-line switch for asm6800.c -- n...
cc0e06ae	2020-11-22 17:23:23	Joel Matthew Rees	unasm changed to runtime option for 6801, lightly tested,...
5943efec	2020-11-22 02:42:52	Joel Matthew Rees	got the bug in the opcode determinant logic for 8-bit bin...
a8cfd78e	2020-11-22 02:27:01	Joel Matthew Rees	bad boolean math for 8-bit binary
73ec1852	2020-11-22 02:03:25	Joel Matthew Rees	buggy in 6800 mode, not sure why
7b9a5a57	2020-11-17 19:51:19	Joel Matthew Rees	forth conversion complete
36b72d7f	2020-11-17 16:14:57	Joel Matthew Rees	tests file needs a more explicit name
6fd5f840	2020-11-17 01:24:53	Joel Matthew Rees	assembler additions functional, lightly tested, but allow...
b9eccc1d	2020-11-16 00:16:42	Joel Matthew Rees	unasm now has 6801 stuff and is lightly tested, adding te...

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The following description was automatically pulled in from Joe H. Allen's project readme. Many of the links are broken here, and I don't intend to fix them at this time. Go to his project pages on github ( https://github.com/jhallen/exorsim ) to access unbroken links.

exor    This is the simulator

mdos    This provides file access to MDOS diskette images

unasm   This is a stand-alone 6800 disassember

./exor mdos.dsk

imdu disk.imd disk.dsk /b

    M68MDOS3_MDOS3um_Jun79.pdf  Operating system user's manual.
    MEK6800D2.pdf           Microprocessor datasheet
    M6800_Microprocessor_Applications_Manual_1975.pdf
    Motorola_M6800_Programming_Reference_Manual_M68PRM(D)_Nov76.pdf

./exor --swtpc flex2.dsk

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