Rebus (year hack)

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EMU Infos
dumper f205v
date 05/01/2020
PCB Infos
name 1686
description Rebus (year hack)
year 1997
manufacturer Microhard


Technical references


QTY Type clock position function
1x MC68000P12 11.99MHz(@15) u1 16/32-bit Microprocessor - main
1x Z0840006PSC 3.748MHz(@6) u162 8-bit Microprocessor - sound
1x M5205 400.6kHz(@16) - 400.7kHz(@17) u172 ADPCM Speech Syntesis IC - sound
1x YM3812 52.6kHz(@20) - 937kHz(@23) - 3.748MHz(@24) u165 FM Operator Type-L II (OPL II) - sound
1x YM3014 937kHz(@5) u173 D/A Converter (DAC) - sound
1x LM324J - u169 Quad Operational Amplifier - sound
1x TDA2003 - u175 Audio Amplifier - sound
1x oscillator 24.000MHz osc1
1x oscillator 30.000MHz osc2
1x blu resonator CSB400P osc3


QTY Type position status
1x Signetics 27C512 1 dumped
4x M27C1001 10,11,12,13 dumped
3x M27C4001 2,6,9 dumped
5x AM27C040 3,4,5,7,8 dumped


QTY Type position
6x MCM2018AN45 u43,u44,u65,u85,u86,u164
4x KM6264BLS-7 u20,u21,u120,u121
1x KM681000ALP-7L u55


QTY Type position status
1x HY18CV8S-25 u166 read protected
7x GAL16V8-25LNC u17A,u17B,u61,u150,u152,u160,u161 read protected
1x GAL20V8-25LNC u10 read protected


1x 28x2 JAMMA edge connector
1x trimmer (volume)(TRIM1)
2x 8 DIP switches banks (Sw1,SW2)


PCB is marked: "937" and "lc" on component side ("LC" is the Italian for "Lato Componenti" which translates to "Components Side")
PCB is marked: "001" and "ls" on solder side ("LS" is the Italian for "Lato Saldature" which translates to "Solders Side")

update 20200112: comment from Osso: "this is a year hack: it has 4 different bytes total, 2 to change 1995 to 1997 in two places and 2 corresponding changes to fix the checksum"



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