Unknown Amstar

Etched in copper on top of pcb			AMSTAR ELEC
						ASSY 1061-3700/	(c)	PCB
						SER NO			94V-0

Etched in copper on bottom of pcb		SOLDER SIDE
						1061-0700/4

Etched in copper on top of daughter board	PROM 1		PROM 2
						1061 3750	COMP SIDE
						

.e5	2708
.e8	TMS2764			<-- on daughter card
.f2	6301 read as 82s129
.g1	6301 read as 82s129
.g2	6301 read as 82s129	stickered	01 1602
.h2	6301 read as 82s129
.j2	6301 read as 82s129
.d2	6301 read as 82s129

Unknown 24 pin socketed chip at B4	stamped	signetics logo	8050
					C 27139 M
					4502

Unknown 24 pin socketed chip at B5	stamped	signetics logo	8323
					C29114
					4501

Traced the pins...
Most pins connected to the 2708 so that was used for signal names

A7			VCC
A8			D0
A9			D1
Pin 4 of a 74157	D2
A0			D3
A1			D4
A2			D5
A3			D6
A4			Pin 18 of a 74374
A5			Pin 4 of a 7400 for B5 and Pin 13 of a 7400 for B4
A6			GND
GND			Pin 5 of a 7400

Both chips had the same pinout except for pin 15


Mame .280
C:\Siftware\roms>c:\games\mame_command\mame -romident c:\siftware\roms\amst\roms 
Identifying c:\siftware\roms\amst\roms....
amst.e5              NO MATCH
amst.e8              NO MATCH
amst.f2              NO MATCH
amst.g1              NO MATCH
amst.g2              NO MATCH
amst.h2              NO MATCH
amst.j2              NO MATCH

Final pinout used to read the chips as a 2764
A7			VCC
A8			D0
A9			D1
A10			D2
A0			D3
A1			D4
A2			D5
A3			D6
A4			D7
A5			A11
A6			GND
GND			Invert of /OE from 2764

Only saved 12 bits off address since there was no room for A12.
A11 looks like another enable line, since data is all 0's when it is high.

Mame .283
C:\Siftware\roms>c:\games\mame_command\mame -romident c:\siftware\roms\amst\roms 
Identifying c:\siftware\roms\amst\roms....
amst.b4              NO MATCH
amst.b5              NO MATCH
amst.e5              NO MATCH
amst.e8              NO MATCH
amst.f2              NO MATCH
amst.g1              NO MATCH
amst.g2              NO MATCH
amst.h2              NO MATCH
amst.j2              NO MATCH