Sub Hunter (Model Racing)

EMU Infos
dumper	Piero Andreini
date	18/10/2015
emulator	MAME 0.167
dev	David Haywood

PCB Infos
name	subhuntr on ProgettoEMMA subhuntr on Arcade Database
description	Sub Hunter (Model Racing)
year	1979
manufacturer	Model Racing

Technical references

CPUs

QTY	Type	clock	position	function
1x	CT430I		main PCB B8	Universal Sync Generator (PAL) - Video
2x	2636		main PCB H5 L5	Programmable Video Interface
1x	2650	OSC/2 = 1.7897725 MHz	main PCB F5	8-bit Microprocessor - main
1x	oscillator	3.579545 MHz	main PCB A9
1x	LM324	-	sound PCB A	Quad Operational Amplifier - sound
3x	LM741	-	sound PCB B,C,D	Operational Amplifier - sound

ROMs

QTY	Type	position	status
4x	2708	main PCB F7,H7,L7,N7	dumped
1x	N82S115	main PCB B2	dumped

RAMs

QTY	Type	position
2x	2101-1	main PCB B4,C4

PLDs

QTY	Type	position	status
0x

Others

1x 43x2 edge connector (main PCB)
1x 22x2 edge connector (sound PCB)
6x trimmer (sound PCB VR1-VR6)

Notes

main PCB is marked "CS217" and "20520/1L" and is labeled "09900278"
sub PCB is marked "CS218" and is labeled "10901903"
From Piero Andreini:

Memory map is:
Address		Name	Pos	Fluke CRC
0000-03FF	MR21	6F	3620
0400-07FF	MR22	6H	017D
0800-0BFF	MR25	6L	8464
0C00-0FFF	MR24	6N	FD3D

RAM should be from 1C00 to 1FFF

All components are dated "1979", it's a color game (as opposed to B/W Taito's "Depthcharge" or Gremlin's "Sub Hunter"), so we can assume release year to be 1979.

update 20210426: from Cuavas and Tafoid: ~~the Model Racing Sub Hunter PCB has been stripped for parts, it's missing the main RAM (only text layer RAM present which the CPU can't read back), and one PVI.~~
added schematics

update 20210601: from Alessio: there is a fully working original cabinet in Alessio's arcade collection.
Confimed that there is a difference between schematics and real hardware.
On schematics there are:
2x 2636 main PCB N5 - Programmable Video Interface
8x 2112-2 main PCB G8,G9,H8,H9,L8,L9,M8,M9
which are not present on the real working PCB.
Added pics