MFP/420s Motherboard Settings and Configuration

Processor	80486SX/80487SX
Processor Speed	20MHz
Chip Set	Tandy
Max. Onboard DRAM	32MB
Cache	None
BIOS	Phoenix/Grid
Dimensions	355mm x 304mm
I/O Options	Bus mouse port, floppy drive interface, IDE interface parallel port, serial port (2), VGA feature connector, VGA port
NPU Options	4167

VRAM CONFIGURATION
Size	VRAM	Location	SW1/switch 6
512KB	(2) 44256	Bank 0	closed
1024KB	(2) 44256	Banks 0 & 1	open

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	BAT	Floppy drive interface	C6
Board LED	BLED	IDE interface	C7
VGA port	C1	Power LED	PLED
Bus mouse port	C2	Reset switch	RES
Parallel port	C3	Speaker	SPK
Serial port 2	C4	Riser card	S1
Serial port 1	C5

USER CONFIGURABLE SETTINGS
Function		Switch	Position
»	On-board Video System enabled	SW1/switch 7 SW1/switch 8	closed open
	On-board Video System disabled	SW1/switch 7 SW1/switch 8	open closed
»	Factory configured - do not alter	SW2/switch 1	open
»	Factory configured - do not alter	SW2/switch 2	open
»	Monitor type select color	SW2/switch 3	open
	Monitor type select monochrome	SW2/switch 3	closed
»	Factory configured - do not alter	SW2/switch 4	open

VIDEO SWITCH CONFIGURATION (SW1)
Mode	switch 1	switch 2	switch 3	switch 4	switch 5
56Hz vertical refresh 1	open	open	N/A	N/A	N/A
60Hz vertical refresh 1	open	closed	N/A	N/A	N/A
72Hz vertical refresh 1	closed	open	N/A	N/A	N/A
Enable interlaced 2	N/A	N/A	open	open	N/A
60Hz non-interlaced 2	N/A	N/A	open	closed	N/A
72Hz non-interlaced 2	N/A	N/A	closed	open	N/A
31.5KHz horizontal scan rate 3	N/A	N/A	N/A	N/A	open
40KHz horizontal scan rate 3	N/A	N/A	N/A	N/A	closed
Note 1 :When monitor resolution is 800 x 600. Note 2 :When monitor resolution is 1024 x 768. Note 3 :When monitor resolution is 640 x 480 or below.

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(4) 1M x 9	NONE
5MB	(4) 1M x 9	(4) 256K x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
17MB	(4) 256K x 9	(4) 4M x 9
20MB	(4) 1M x 9	(4) 4M x 9
32MB	(4) 4M x 9	(4) 4M x 9