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AFAIK, that board form factor and connector type (Euromechanics?) is not 'owned' by any bus. Plus, the manual definitely describes an ISA bus.

That's not VME - doesn't have the signature VME release mechanisms on the backplates, the size of the cards looks different, and the spacing between the Eurocard connectors on the processor board is too close for 6U VME. There's nothing to stop you running ISA on Eurocard connectors like that except mechanical compatibility. But perhaps that's what they wanted - restrict people to buying their own, more expensive cards.

Well, I can easily imagine an Eastern Bloc machine not caring much about compatibility anyway. I mean, the Russians made an Apple II clone that has no chance in hell of running most actual Apple II software. Finding out stuff like that is exactly the sort of thing that I really enjoy about MESS.

Have to admit I enjoy reading the source more than actually running MAME/MESS these days. I have no time for emulating systems, but I really like looking at how they worked.

I suspect these boards were OEMd from some Taiwan manufacturer of industrial PCs, actually.

The Besta series was like that -- apparently they bought the license and production line for Force SYS68K series boards. Later revisions had some original designs though.

I am not an Apple II person but seem to recall that Bulgarians cloned it pretty faithfuly (the Pravetz 8) as opposed to Russians (Agat 7) -- there's a fan page that describes how Apple II games were hacked to run on Agat: http://deka18.tsk.ru/er/agat/Gamez/Gamez.shtml

This draft diff (please review) -- https://gist.github.com/shattered/8072790
- moves ec184*, iskr103* and mc1502 out of pc.c
- moves CGA font upload support to a subclass
- adds new drivers: poisk1, ec1847, pk88
- adds a skeleton of native iskr103* keyboard
- adds more ROM revisions to existing drivers (how should I submit those?)
- etc.

Notes:
- ec1841 can work with isa_hdc.c but not out of the box (WRITESBUFF command is not implemented and other quirks). Will submit a diff later. Native HDC boards are not dumped yet (one version used a Z80 + clone of some XEBEC chip, another a 8089 + 8253 + smaller chips).
- poisk1 is still WIP. Keyboard, video and floppy work but changing disk in drive A: or accessing drive B: causes I/O errors in DOS. Its HDC uses a WD1010 clone but our emulation of it is still WIP.

I'll take care of the patch. As for the ROMS post or PM me a link or send them to Tafoid at code (at) mamedev.org.

There are 2 "Demo disk" ec1841.xml, looks like a copy-paste error.

Yes, the second one should be 'M86 3.2 (modified CP/M-86)'

XT-IDE driver works with poisk1 but requires a debugger hack, since poisk1 checksum routine is different. Assuming "v91" BIOS (the default), the hack is

bpset fee68,ds==c800,{do ax=0200;go}