MODEL D (REVISION CC1/CC2) Motherboard Settings and Configuration

Processor	8088 (exact location unknown)
Processor Speed	4.77/7.16MHz
Chip Set	Unknown
Max. Onboard DRAM	640KB
Cache	None
BIOS	Unknown
Dimensions	254mm x 218mm
I/O Options	Floppy drive interface, parallel port, serial port, VGA port
NPU Options	8087

CONNECTIONS
Purpose	Location	Purpose	Location
Parallel port	J5	Keyboard	J16
Serial port	J6	Speaker	J17
VGA port	J7	Reset switch	J18
Light pen port	J10	Power-on LED indicator	J19
Floppy drive interface	J13

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Factory configured - do not alter	J8	N/A
»	Monitor enabled	J9	Closed
	Monitor disabled	J9	Open
»	Factory configured - do not alter	J15	open
»	Real time clock enabled	J15	pins 1 & 6 closed
	Real time clock disabled	J15	pins 2 & 7 closed
»	Parallel port enabled	J15	pins 2 & 7 open
	Parallel port disabled	J15	pins 3 & 8 closed
»	Floppy drive interface enabled	J15	pins 3 & 8 open
	Floppy drive interface disabled	J15	pins 4 & 9 closed
»	Serial port enabled	J15	pins 4 & 9 open
	Serial port disabled	J15	pins 5 & 10 closed
»	Video mode TTL monochrome	SW1	pins 5 & 10 open
	Video mode CGA	SW1	Down
»	Factory configured - do not alter	SW2/switch 1	Off
»	NPU disabled	SW2/switch 2	On
	NPU enabled	SW2/switch 2	Off
»	Factory configured - do not alter	SW2/switch 3	On
»	Memory test 64KB	SW2/switch 4	On
	Memory test all	SW2/switch 4	Off
»	Factory configured - do not alter	SW2/switch 5	Off
»	Factory configured - do not alter	SW2/switch 6	Off
Note:The exact location of J8 is unknown.

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	J14
512KB	(9) 4164	(9) 4164	NONE	pins 2 & 3 closed
640KB	(9) 41256	(9) 41256	(9) 41128	pins 1 & 2 closed

CPU SPEED CONFIGURARION
Speed	SW3
4.77MHz	Down
7.16MHz	Up

FLOPPY DISK DRIVES INSTALLED
Number of Drives	SW2/switch 7	SW2/switch 8
1	On	On
2	Off	On
3	On	Off
4	Off	Off

REAL TIME CLOCK INTERRUPT SELECT
IRQ	J11
2	pins 1 & 5 closed
4	pins 2 & 6 closed
5	pins 3 & 7 closed
7	pins 4 & 8 closed