IBM CORPORATION

PS/2 MODEL 70 486/25

Processor	80486DX
Processor Speed	25MHz
Chip Set	IBM
Max. Onboard DRAM	8MB
Cache	None
BIOS	IBM
Dimensions	355.6mm x 304.8mm
I/O Options	Serial port, parallel port, pointing device connector, proprietary hard/floppy drive controller slot, proprietary 16-bit MCA video adapter slot, VGA port
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Battery/speaker	J1	Keyboard	J5
Serial port	J2	Proprietary hard/floppy drive controller	J6
Parallel port	J3	Proprietary 16-bit MCA video adaptor	J7
Pointing device	J4	VGA port	J8

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(1) 256K x 36	NONE	NONE	NONE
2MB	(1) 256K x 36	(1) 256K x 36	NONE	NONE
2MB	(1) 512K x 36	NONE	NONE	NONE
3MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	NONE
4MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
4MB	(1) 512K x 36	(1) 512K x 36	NONE	NONE
5MB	(1) 256K x 36	(1) 512K x 36	(1) 512K x 36	NONE
6MB	(1) 256K x 36	(1) 256K x 36	(1) 512K x 36	(1) 512K x 36
6MB	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36	NONE
7MB	(1) 256K x 36	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36
8MB	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36
Notes:SIMMs are a proprietary IBM design, standard 36-bit SIMMs can not be used. Onboard memory does not need to be totally populated in order to use memory expansion cards.

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