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dec0.cpp: Decapped and dumped the i8751 MCU for Dragonninja (Japan revision 1) [TeamEurope, Brian Troha]

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braintro 2019-09-27 09:33:46 -05:00
parent 949ceb263f
commit 5c7e89ec44
1 changed files with 3 additions and 18 deletions
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21
src/mame/drivers/dec0.cpp
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@ -54,21 +54,7 @@ ToDo:
- Hook up the 68705 in Midnight Resistance (bootleg) (it might not be used, leftover from the Fighting Fantasy bootleg on the same PCB?)
- Get rid of ROM patch in Hippodrome;
- background pen in Birdie Try is presumably wrong.
- Pixel clock frequency isn't verified;
- Finally, get a proper decap of the MCU used by Dragonninja
The current Dragonninja MCU program was made by hacking the expected startup
synchronisation command in the Bad Dudes MCU program (location $09A4 changed
from $0B to $03). There may be other differences in a real Dragonninja MCU.
The table of expected values for command 7 is the same for Dragonninja (from
debugging main CPU program).
Bad Dudes only seems to use commands $0B (sync), $01 (reset if parameter is not
$3B), $07 (return table index if parameter matches table otherwise reset) and
$09 (set table index to zero). Dragonninja only seems to use commands $03 (on
startup), $07 (same function as Bad Dudes) and $09 (same function as Bad
Dudes). Most of the MCU program isn't utilised.
- Pixel clock frequency isn't verified
Guru-Readme for Data East 16 bit games (Updated 7-Feb-2017)
@ -2386,9 +2372,8 @@ ROM_START( drgninja ) /* DE-0297-0 main board, DE-0299-0 sub/rom board */
ROM_REGION( 0x10000, "audiocpu", 0 ) /* Sound CPU */
ROM_LOAD( "eg07.8a", 0x8000, 0x8000, CRC(001d2f51) SHA1(f186671f0450ccf9201577a5caf0efc490c6645e) )
ROM_REGION( 0x1000, "mcu", 0 ) /* i8751 microcontroller - using hacked baddudes program */
ROM_LOAD( "eg31.9a", 0x0000, 0x1000, CRC(c3f6bc70) SHA1(3c80197dc70c6cb283df5d11d29a9d9baabcd99b) BAD_DUMP ) // Hand crafted, needs real dump
ROM_REGION( 0x1000, "mcu", 0 ) /* i8751 microcontroller */
ROM_LOAD( "eg31.9a", 0x0000, 0x1000, CRC(657aab2d) SHA1(c3b3837d1208596509e09ddd8e3e58845a4e07b2) )
/* various graphic and sound roms also differ when compared to baddudes */
ROM_REGION( 0x10000, "gfx1", 0 ) /* chars */