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Joined: Mar 2001
Posts: 17,098 Likes: 153
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Very Senior Member
Joined: Mar 2001
Posts: 17,098 Likes: 153 |
Neat. Hopefully we can get some PCB pics and stuff 
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Joined: May 2012
Posts: 562 Likes: 4
Senior Member
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OP
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Joined: May 2012
Posts: 562 Likes: 4 |
Owner is AFK until Feb 15 so no pics for now 
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Joined: May 2012
Posts: 562 Likes: 4
Senior Member
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OP
Senior Member
Joined: May 2012
Posts: 562 Likes: 4 |
A music disk for 'apogee', uses its 3-channel sound generator: http://yadi.sk/d/SSzTb555GtfJB (discussion: http://zx.pk.ru/showthread.php?t=22573) Author warns that it was designed for another emulator (Emu80) and will not sound exactly the same in others. To play it in MESS: - attach cassette image (*.rka) - at the '==>' prompt, enter 'I' <return> and start the tape - run it: 'G0' <return>
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Joined: May 2012
Posts: 562 Likes: 4
Senior Member
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OP
Senior Member
Joined: May 2012
Posts: 562 Likes: 4 |
Firmware from ec1841's XT-HDC (i8089 version; there was also a Z80 one) -- http://www.emuverse.ru/downloads/computers/ES-184x/firmware/ES-1841-KZHD.zipThere's no tech manual or schematics but here's a photo -- http://fotki.yandex.ru/users/shattered/view/642515?page=0Disassembly looks sane but I never saw i8089 assembly before
00000000: 31 30 00 80 movi gb, 8000
00000004: D1 30 08 84 movi cc, 8408
00000008: 0A 4D 18 40 movbi [gb].18, 40
0000000C: 28 20 30 addbi gb, 30
0000000F: 08 30 3E movbi ga, 3e
00000012: A0 00 wid 8, 16
00000014: 60 00 xfer
00000016: 68 30 06 movbi bc, 06
00000019: 28 20 D0 addbi gb, d0
0000001C: 48 30 00 movbi gc, 00
Last edited by shattered; 02/21/14 07:55 PM.
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Joined: Jan 2012
Posts: 890 Likes: 17
Senior Member
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Senior Member
Joined: Jan 2012
Posts: 890 Likes: 17 |
Yeah, that looks like valid 8089 asm. gb is the source pointer, ga the destination and bc the counter. bc is loaded after the transfer because there is a one instruction delay after the xfer instruction before the dma begins.
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Joined: May 2012
Posts: 562 Likes: 4
Senior Member
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OP
Senior Member
Joined: May 2012
Posts: 562 Likes: 4 |
mc1502's DOS-clone cannot format floppies and I suspect that it doesn't like when wd_fdc_t::status_r() sets S_IP bit in IDLE state even when previous command was not type 1.
Commenting out "main_state == IDLE" makes formatting work, but I'm unsure how this affects other drivers.
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Joined: May 2012
Posts: 562 Likes: 4
Senior Member
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OP
Senior Member
Joined: May 2012
Posts: 562 Likes: 4 |
fun fact: MDA-clone for ec1840/ec1841 runs in 'low-resolution' mode (8x8 chargen) [1]. Plus, its chargen is in RAM, just like in CGA-clone for that series. [1] http://www.seasip.info/VintagePC/mda.html
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Joined: May 2012
Posts: 562 Likes: 4
Senior Member
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OP
Senior Member
Joined: May 2012
Posts: 562 Likes: 4 |
... its character cell is 8x14 but I'm unsure how it's padded vertically, anyway, WIP: 
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Joined: Mar 2001
Posts: 17,098 Likes: 153
Very Senior Member
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Very Senior Member
Joined: Mar 2001
Posts: 17,098 Likes: 153 |
Nice work, shattered
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Joined: May 2012
Posts: 562 Likes: 4
Senior Member
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OP
Senior Member
Joined: May 2012
Posts: 562 Likes: 4 |
There's still mouse adapter to be emulated and the driver could be marked WORKING
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