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Ahh, /RESET instead of RESET?

On the 1793, yeah `sfdos' boots now. `ots' boots too but is a bad dump (missing tracks 81+) and so doesn't work.

The /RESET fix etc: https://gist.github.com/shattered/6692200

MS-DOS works and much quicker too.

I've seen random hangs in sfdos when programs quit to DOS (sometimes there's a lot of unmapped reads in the error log).

Also, is formatting supposed to work on wd_fdc?

https://gist.github.com/shattered/6720688 -- 3-channel sound support for apogee

Sample tunes to listen to: http://zx.pk.ru/showthread.php?t=21500 (in the player.rar attachment)

Sources for ec1841, poisk1 and poisk2 BIOS -- https://github.com/shattered/retro-bios

(Files are in koi8-r encoding.)

That's a unique way to get 3 channel audio, summing 3 PIT channels as the input to a speaker

Yeah -- if I'm reading the schematics correctly -- see sheet 2 of http://www.emuverse.ru/downloads/computers/Apogey/docs/Apogey_BK-01C_Schematics_Retouched.djvu

EDIT: actually, only channel 0 goes to the built-in speaker; the line out gets all 3 channels, summed.

ec1841 stuff:

https://gist.github.com/shattered/6751786 -- native keyboard
https://gist.github.com/shattered/6751887 -- DIP switches, memory banking

Keyboard dump: 1816BE48.BIN in http://eska.xost.ru/soft/1841rom.zip

Memory banking: the machine can hold 4 memory boards of 512K each. The API is very much like XMS INT 15h interface (AH=87H and AH=88H). VDISK.SYS in DOS-clone (ados0201 in the softlist) definitely can use it.