X68000 - TSR XSIMM10ss Memory Expansion Board

Sharp X68000 - TSR XSIMM10ss Memory Expansion Board

This is an old revision of the document!

Images sourced from: http://painkilla.egloos.com/m/2623979

Because there is a mix of 30pin (16bit each) and 72pin sockets (32bit each), there is an insane number of possible configurations that you can set the board up to use.

Note: 'Memory Size' in the below table refers to the expansion memory size, not the entire system memory size.

Dip Switch G	Dip Switch A	DRAM Density	Slot A	Slot B	Slot C	A23-A20	Memory Size
0000	0000	4MBit	-	-	-	-	-
0001	0001	4MBit	8MB	-	-	2	8MB
0001	0010	4MBit	8MB	-	-	4	8MB
0001	0011	4MBit	8MB	-	-	6	6MB
0001	0100	4MBit	8MB	-	-	8	4MB
0001	0101	4MBit	8MB	-	-	A	2MB
0010	0001	4MBit	8MB	4/6/8MB	-	2	10MB
0011	0001	4MBit	6MB	-	-	2	6MB
0011	0010	4MBit	6MB	-	-	4	6MB
0011	0011	4MBit	6MB	-	-	6	6MB
0011	0100	4MBit	6MB	-	-	8	4MB
0011	0101	4MBit	6MB	-	-	A	2MB
0100	0001	4MBit	6MB	4/6MB	-	2	10MB
0100	0010	4MBit	6MB	4/6MB	-	4	8MB
0101	0001	4MBit	4MB	-	-	2	4MB
0101	0010	4MBit	4MB	-	-	4	4MB
0101	0011	4MBit	4MB	-	-	6	4MB
0101	0100	4MBit	4MB	-	-	8	4MB
0101	0101	4MBit	4MB	-	-	A	2MB
0110	0001	4MBit	4MB	4MB	-	2	8MB
0110	0010	4MBit	4MB	4MB	-	4	8MB
0110	0011	4MBit	4MB	4MB	-	6	6MB
0111	0001	16MBit	16MB	-	-	2	10MB
0111	0010	16MBit	16MB	-	-	4	8MB
0111	0011	16MBit	16MB	-	-	6	6MB
0111	0100	16MBit	16MB	-	-	8	4MB
0111	0101	16MBit	16MB	-	-	A	2MB
1000	0001	16MBit	8MB	-	-	2	8MB
1000	0010	16MBit	8MB	-	-	4	8MB
1000	0011	16MBit	8MB	-	-	6	6MB
1000	0100	16MBit	8MB	-	-	8	4MB
1000	0101	16MBit	8MB	-	-	A	2MB
1001	0001	16MBit	8MB	4/6/8MB(1,2)	-	2	10MB
1010	0001	4MBit	-	-	2x 4MB	2	8MB
1010	0010	4MBit	-	-	2x 4MB	4	8MB
1010	0011	4MBit	-	-	2x 4MB	6	6MB
1010	0100	4MBit	-	-	2x 4MB	8	4MB
1010	0101	4MBit	-	-	2x 4MB	A	2MB
1011	0001	4MBit	4/6/8MB(1,2)	-	2x 4MB	2	10MB
1100	0001	1MBit	-	-	2x 1MB	2	2MB
1100	0010	1MBit	-	-	2x 1MB	4	2MB
1100	0011	1MBit	-	-	2x 1MB	6	2MB
1100	0100	1MBit	-	-	2x 1MB	8	2MB
1100	0101	1MBit	-	-	2x 1MB	A	2MB
1101	0001	1MBit	8MB(1)	-	2x 1MB	2	10MB
1110	0001	1MBit	8MB(2)	-	2x 1MB	2	10MB
1111	0001	1MBit	6MB	-	2x 1MB	2	8MB
1111	0010	1MBit	6MB	-	2x 1MB	4	8MB
1111	1000	1MBit	4MB	-	2x 1MB	2	6MB
1111	1001	1MBit	4MB	-	2x 1MB	4	6MB
1111	1010	1MBit	4MB	-	2x 1MB	6	6MB
1111	1011	1MBit	4MB	4MB	2x 1MB	2	10MB

There are a couple of variations of the same sizes - they are:

(1) 4MBit DRAM density
(2) 16MBit DRAM density

Note: If you want to max out the memory capacity, by far the simplest option is to stick a single 16MB 72pin SIMM in slot A.

Table of Contents

X68000 - TSR XSIMM10ss Memory Expansion Board

Manual Scans

Memory Configurations

Target-Earth