Z-2500 SERIES Motherboard Settings and Configuration

Processor	80286
Processor Speed	12MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	6MB
Maximum Video Memory	None
Cache	None
BIOS	Unidentified
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80287

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	J101	Open
»	NPU clock mode select mode /3 for 80287, /2 for 80C287	J103	Closed
	NPU clock mode select direct mode	J103	Open
	Parallel printer decode	J106	Unidentified
»	ROM DMA blocked	J113	Pins 1 & 2 closed
	ROM DMA not blocked	J113	Pins 2 & 3 closed
»	Speaker enabled	J114	Closed
	Speaker disabled	J114	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(4) 256K x 9	None
3MB	(4) 256K x 9	(2) 1M x 9
6MB	(4) 1M x 9	(2) 1M x 9

DRAM TYPE SELECTION
Type	J102
256K x 9 in Bank 0	Pins 2 & 3 closed
1M x 9 in Banks 0 & 1	Pins 1 & 2 closed

SCP SPEED SELECTION
Speed		P113
	7.16MHz	Pins 1 & 2 closed
»	8MHz	Pins 5 & 6 closed
	12MHz	Pins 3 & 4 closed

NPU SPEED SELECTION
Clock speed		80287	80C287	P113
	8MHz	2.7MHz	4MHz	Pins 9 & 10 closed
»	16MHz	5.3MHz	8MHz	Pins 13 & 14 closed
	24MHz	8MHz	12Hz	Pins 7 & 8 closed
Note: See also J103 setting.

POACH SELECTION
Setting		J115	J116
»	POACH 1 chip installed in U169	Pins 2 & 3 closed	Pins 2 & 3 closed
	POACH 7 chip installed in U169	Pins 1 & 2 closed	Pins 1 & 2 closed