Rebus (year hack)

EMU Infos
dumper	f205v
date	05/01/2020
emulator
dev

PCB Infos
name	1686
description	Rebus (year hack)
year	1997
manufacturer	Microhard

Technical references

CPUs

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

ROMs

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

RAMs

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

PLDs

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

Others

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

Notes

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"