World Rally 2: Twin Racing (different EPROMs)

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EMU Infos
dumper f205v
dump date 17/01/2009
PCB Infos
name 761
description World Rally 2: Twin Racing (different EPROMs)
year 1995
manufacturer Gaelco


Technical references


QTY Type clock position function
1x MC68000P12 u48 16/32-bit Microprocessor - main
1x custom GAE1-449 u57 main
1x DS5002FP u47 Secure Microprocessor Chip
1x oscillator 26.000MHz xtal1
1x oscillator 34.000MHz xtal2


QTY Type position status
2x NM27C040Q 62,63 dumped
1x MASKROM 1Mx8 68 dumped
2x MASKROM 1Mx16 69,70 dumped, maybe bad dump


QTY Type position
4x KM428C256J 53,54,55,56
2x HM3-65764E 32,33
2x CY7C199-20 75,76
2x HM3-65756H 49,50
1x MB84256A 34


QTY Type position status
1x TI F20L8-25CNT 39 read protected
1x TI F16R8-15CN 27 read protected
1x TI F16L8-25CN 30 read protected


1x JAMMA edge connector
1x 6 legs connector (conn1)
1x 15 legs connector (conn2)
1x 4 legs connector (conn4)
2x trimmer (volume)(p1,p2)
1x battery 3V


This is the same PCB revision (950510-1) as already documented in MAME source gaelco2.c, but with a number of differences:
1) Gaelco custom chip is 449 instead of 506
2) total EPROMs size is less than in revision 950510 (more specifically it looks like the content of 09,10,16,17 is missing)
The PCB is totally dead, therefore I can not make any screen comparison.

update 20180130:
Comment from Haze: "it's very obviously missing 2MB total rom data, so something isn't dumped at the right size. (there are no empty positions, so it's clearly a 'wrong size' error)"
Comment from Brian Troha: "So if it’s missing 2MB of data, one of the mask roms IC70 or IC69 is dumped at half size."
Comment form me: "Unfortunately this PCB was bartered for something else a long time ago, it's no more available."



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