Borne out of a conversation either on Whatsapp or at a Parcade meet, cNp
complaining that Kung Fu Master freeplay is rubbish, in attract mode
the screen just sits there displaying 2 credits and asking you to press
the 1 or 2 player start button. Then the suggestion made that I
wouldn't be able to fix it...
Not a game I've ever played (or likely to play in the future), but fortunately it's a Z80 based game, my favourite processor. A bit of
coding later and we have proper attract mode when in freeplay, with the
game cycling through attract mode as it does in paid mode.
As it's the full set of game ROMs I don't want to publish the full
ROMset here so it will need you to modify game ROMs 4e & 4d using
your favourite hex editor (note they are on the main board next to the
Z80 CPU, not on the top board which are the graphics ROMs) which should
be 27128s.
The changes to 4e are the main freeplay code, the changes to 4d defeat the ROM checksum in test mode.
There are slightly different changes required (for ROM 4d) for Kung Fu Master and for Spartan X - see changes below.
I've also completed the code to include high score save which works in
mame (it will require one of the RAMs to be replaced with an NVRAM
module) but I won't release the code until it's tested on proper
hardware (hopefully soon)
ROM changes...
Common (ROM 4E) [a-4e-c.bin or a-4e-c-j.bin]
$3F00
22 04 E9 F5 3A 0A E9 B7 20 10 3A 06 E0 B7 20 0A 3A 04 E9 E6 03 28 03 32 13 E9 F1 C9
$0d37
C3 00 3F
$0D9E
00 00 00
Specific (ROM 4D) [a-4d-c.bin or a-4d-c-j.bin]
Kung Fu Master
Absolute locations $770F & $771B (ROM location $370F & $371B)
18
Spartan X
Absolute locations $772F & $773B (ROM location $372F & $373B)
18
And the photos...
Original freeplay mode (just sat with 2
credits asking you to press P1 or P2 start)
Kung Fu Master cycling through attract mode with the new code
Spartan X
cycling through attract mode with the new code
Game board with the ROMs installed
complaining that Kung Fu Master freeplay is rubbish, in attract mode
the screen just sits there displaying 2 credits and asking you to press
the 1 or 2 player start button. Then the suggestion made that I
wouldn't be able to fix it...
Not a game I've ever played (or likely to play in the future), but fortunately it's a Z80 based game, my favourite processor. A bit of
coding later and we have proper attract mode when in freeplay, with the
game cycling through attract mode as it does in paid mode.
As it's the full set of game ROMs I don't want to publish the full
ROMset here so it will need you to modify game ROMs 4e & 4d using
your favourite hex editor (note they are on the main board next to the
Z80 CPU, not on the top board which are the graphics ROMs) which should
be 27128s.
The changes to 4e are the main freeplay code, the changes to 4d defeat the ROM checksum in test mode.
There are slightly different changes required (for ROM 4d) for Kung Fu Master and for Spartan X - see changes below.
I've also completed the code to include high score save which works in
mame (it will require one of the RAMs to be replaced with an NVRAM
module) but I won't release the code until it's tested on proper
hardware (hopefully soon)
ROM changes...
Common (ROM 4E) [a-4e-c.bin or a-4e-c-j.bin]
$3F00
22 04 E9 F5 3A 0A E9 B7 20 10 3A 06 E0 B7 20 0A 3A 04 E9 E6 03 28 03 32 13 E9 F1 C9
$0d37
C3 00 3F
$0D9E
00 00 00
Specific (ROM 4D) [a-4d-c.bin or a-4d-c-j.bin]
Kung Fu Master
Absolute locations $770F & $771B (ROM location $370F & $371B)
18
Spartan X
Absolute locations $772F & $773B (ROM location $372F & $373B)
18
And the photos...
Original freeplay mode (just sat with 2
credits asking you to press P1 or P2 start)
Kung Fu Master cycling through attract mode with the new code
Spartan X
cycling through attract mode with the new code
Game board with the ROMs installed
