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It looks like mc1502 uses same cassette format as ibm5150 (and probably the same BIOS code):



Tape dumps are at http://www.pk-info.ru/ms1502/files/ but 3 of 4 are corrupted (truncated?). "Tape13" is OK, and is the one in the screenshot.

Cassette input in mc1502 itself doesn't yet work.

...it does now. IBM diagnostics' loader loads fine :-)

Nice!

With a bit of hackery, mc1502 how has diskette I/O. This machine had the usual cloned MS-DOS (nee Sigma-Four DOS) and something original called OTS (One Track System), for low-memory (128K) machines. DOS runs, OTS boots but hangs.

I found some games and put them in a 720K disk (default format for this machine). Also included is the 'Immortal Player' (ip73.com) -- a kind of Action Replay for 73 games of 1980s:

Disk: http://goput.it/3x1.zip

ANTIX.COM, ARKANOID.COM, AV.EXE, BILLIARD.EXE, COLUMNS.EXE, DIG.EXE, GAPPER.EXE, GO-MOKU.COM, GOODY.COM, IP73.COM, KICKS.COM,
LIVING.COM, NINJA.EXE, PENTIX.EXE, PUSHER.EXE, SOKOBAN2.EXE, TET.EXE, TOWER.EXE

The screenshot remember me on the good old NC.

I wrote a very skeletal driver for Besta (68030 + console ports) and possibly found a bug in m68000 cpu core:

fmove_rm_reg: unknown constant ROM offset 3f at ff00ff1c

The command at that offset is 'fmovecr #$3f, fp0'

Huh, I thought I'd implemented all the ROM constants. Will check what 3f is.

Holy crap I think I remember that. Nostalgia bomb!

Try now. Don't know why they're loading 1.0e4096 exactly, but

Yep, no crash now.

It looks like a CPU test in the POST sequence:

cp31dsspboot ROM -- loops looking for some VME device after 'BIM ERROR' message


cp31dbgboot ROM -- boot menu