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Doesn't matter what it sounds like on another emulator. It's what it sounds like on real hardware that is interesting to us.

Apparently on the real hw the pitch is different too

http://www.ucis.pitt.edu/nceeer/1989-801-5-2-Judy.pdf -- "SOVIET COMPUTER SOFTWARE AND APPLICATIONS IN THE 1980S"

Could be interesting, haven't read it yet.

Having skimmed over it, the history part is definitely interesting and will merit going back and reading properly, but they concentrate mostly on minicomputer and mainframe class stuff. Microcomputers are represented only by the CP/M and MS-DOS clones; the unique Apple II and Spectrum clones we know existed aren't mentioned that I could see.

David A. Wellman - "A Chip in the Curtain: Computer Technology in the Soviet Union", National Defense University Press, 1989

http://www.dtic.mil/dtic/tr/fulltext/u2/a259360.pdf

Turns out that OS for the ec1840 ships a driver, es1840.sys, which loads a much nicer font:

Apparently that adapter is a clone of InPort (bus mouse) interface -- both have a 8255, default port is 23Ch, etc.

Now to find a decent description of the protocol...

Looks pretty simple.

http://www.cs.fsu.edu/~baker/devices/lxr/http/source/linux/drivers/input/mouse/inport.c

mk88's BIOS assumes that floppy drive is QD and silently multiplies track number by 2 before passing it to FDC

What is the clean way to handle this? For now I'm patching the BIOS.

4 more BIOS dumps for mc1502, one of them includes hard disk support -- http://zx.pk.ru/showpost.php?p=582719&postcount=81

Schematic for that hard disk controller (uses i82064) and the machine itself (not sure which hw revision), in OrCAD format -- http://zx.pk.ru/showpost.php?p=583031&postcount=87

I will add the dumps to MESS; not sure how to convert OrCAD files to svg or something though.