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Re: ex- USSR and Soviet Bloc hardware [Re: shattered] #114800
03/04/19 01:52 PM
03/04/19 01:52 PM
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Robotron PC-1715W (yet another CP/M machine) WIP:

[Linked Image]

After that it does something that Z80DMA doesn't like and crashes MAME with fatal error ("Unknown base register").

Last edited by shattered; 03/04/19 05:59 PM.
Re: ex- USSR and Soviet Bloc hardware [Re: shattered] #114818
03/11/19 10:04 PM
03/11/19 10:04 PM
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Wikipedia says that some games for PC-1715 used printer for sound effects (bell, paper feed) - that'd be fun to emulate smile

Re: ex- USSR and Soviet Bloc hardware [Re: shattered] #114862
03/16/19 11:05 PM
03/16/19 11:05 PM
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Originally Posted by shattered
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:

[Linked Image]


WIP -- KES is a clone of iSBC-215 storage controller, but it's different internally (Z80 + Z80DMA + Z80CTC instead of 8089) and will need new code:

[Linked Image]

Re: ex- USSR and Soviet Bloc hardware [Re: shattered] #115031
04/11/19 08:56 PM
04/11/19 08:56 PM
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"Super Games ][" arcade board playing Mario Bros. bootleg/translation hack -- https://www.youtube.com/watch?v=6RUkvGV2zCI

Palette might be wrong and two player mode isn't working (yet)

Re: ex- USSR and Soviet Bloc hardware [Re: shattered] #115111
04/19/19 07:51 PM
04/19/19 07:51 PM
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From the "why not" department:

PS/2-mode floppy controllers have a RDDATA bit in the SRB status register, which essentially samples flux transitions incoming from the drive (each transition toggles the flip-flop and its output is the RDDATA).

"MX:" is the format used by floppy controller on Soviet PDP-11 compatible desktops (the DVK series). Low level encoding is FM, and track format is not compatible with IBM 3740 -- http://torlus.com/floppy/forum/viewtopic.php?f=19&t=1384

MXONPC (http://pdp-11.ru/mybk/pdp11/DRV/MXONPC.RAR) is a DOS program written by Vladimir Poletaev in 1997 to recover data from such floppies on a Pentium-class PC. And with a bit of hacking, it works in MAME (at least some of the time):

[Linked Image]

PR coming soon.

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