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The Agat-9 is one of my white whales - it's not particularly Apple II compatible (the graphics are quite different, actually) but the documentation is entirely in Russian and Google Translate can be weird about it. (Example: this page http://agatcomp.ru/Reading/ebooks-cik7/1.0.OBSHIE_CBEDEHIJA.shtml when translated in Chrome it changes the Cyrillic characters to their Latin equivalents but doesn't actually translate).

The page for the card itself translated OK and it's a fairly standard design except for the noise channels. 2 8253 PIT clones driving DACs for the tone channels is the sort of thing we've definitely seen before.

Google breaks because some chars are actually Latin ones (a, c, o, e, p, x...) :-)

Agat floppies are either 140K GCR (format is identical to Apple's) and 840K MFM (80 tracks, 2 heads, 21 sectors, 256 bytes per sector), but the address marks etc. aren't standard: https://raw.githubusercontent.com/sintech/AGAT/master/docs/agat-840k-format.txt

Hooked this up to SAMdisk via quick copy/paste and it does seem to work

SAMdisk now support MX format (at least its HEAD version does).

de-skeletonized ms0515.cpp -- CPU is a clone of T11, video controller is Spectrum-like and there's a few ported (or maybe recompiled) games, f.e.



Pull request soon. Shout out to Dr. Titus for being the first to emulate this machine in EmuStudio.

Ignoring the 7220 for now, just a generic_terminal:



Looks like they've cloned iSBC firmware for this. Not sure if video boards are clones or reimplementations -- f.e. disk controller (KES) is described (http://www.tiffe.de/Robotron/MMS16/Doku/A7150/KES-K5170.pdf) as iSBC 215A/iSBX 218 compatible but uses a U880 (Z80), not a 8089.

Now with a bit more spectacular fail screen:

Turns out there were 3 variants of video boards -- ABS K7071 (text only), ABG K7072 (dumb framebuffer) and ABG K7075 (7220-based). The latter two are driven by KGS K7070 (terminal emulator with downloadable software).

K7072 wip:

The "keyboard port error 7" goes away if I replace ms7004 with lk201, and then this logo shows up:



It's supposed to look like this:



Not sure yet if emulation of ms7004 is inaccurate, or there was a different firmware for it.

That's the vt240 clone, right? Ugh, I hope there's some video hardware differences because I have no idea what could be wrong to cause that.

Yes, it is the clone. Keyboard firmware could be different too -- the one we have is good enough to work with drivers that don't send anything to keyboard, or run simple tests (f.e. ms0515 sends LK_CMD_REQ_ID and receives expected response), but vt240 does much more (programs modes for various keyboard divisions etc. -- https://www.netbsd.org/docs/Hardware/Machines/DEC/lk201.html)...

Agat-7 (the Apple II non-clone) can use a variant of this keyboard with very different firmware and simpler hardware.