TEK 735 Motherboard Settings and Configuration

Processor	80486DX/80486DX2/SL80486DX2/AM486DX4/80486DX4/AM486DX5
Processor Speed	25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)/ 133(internal)MHz
Chip Set	Unidentified
Video Chip Set	Cirrus Logic
Maximum Onboard Memory	64MB
Maximum Video Memory	2MB
Cache	128/256/512KB
BIOS	Award
Dimensions	339mm x 122mm
I/O Options	Floppy drive interface, IDE interfaces (2), SCSI interface, parallel port, PS/2 mouse interface, serial ports (2), VGA feature connector, VGA port
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
CPU fan power	J1	IDE interface 2	J8
SCSI interface	J2	VGA feature connector	J9
IDE interface 1	J3	PS/2 mouse interface	J10
Floppy drive interface	J4	Power connector	J12
Keyboard, speaker, reset, LED	J5	VGA port	J14
Serial port 1	J6	Parallel port	J15
Serial port 2	J7

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	BIOS boot select normal boot	J13	Open
	BIOS boot select emergency boot	J13	Closed
»	IOCHRDY signal to IDE interface disabled	W15	Open
	IOCHRDY signal to IDE interface enabled	W15	Closed
»	SCSI IRQ select IRQ11	W18	Pins 2 & 3 closed
	SCSI IRQ select IRQ10	W18	Pins 1 & 2 closed
»	Serial download mode disabled	W19/pins 1 & 2	Open
	Serial download mode enabled	W19/pins 1 & 2	Closed
»	VT100 mode disabled	W19/pins 3 & 4	Open
	VT100 mode enabled	W19/pins 3 & 4	Closed
»	TEKNOR extension enabled	W19/pins 5 & 6	Open
	TEKNOR extension disabled	W19/pins 5 & 6	Closed
»	On board video enabled	W19/pins 7 & 8	Open
	On board video disabled	W19/pins 7 & 8	Closed
»	VGA high speed write select 1 wait state	W21	Closed
	VGA high speed write select 0 wait states	W21	Open
»	SCSI I/O port select 340	W22	Open
	SCSI I/O port select 140	W22	Closed
»	Watchdog timer enabled	W24	Closed
	Watchdog timer disabled	W24	Open
»	AT clock generation select >33MHz	W25	Open
	AT clock generation select <33MHz	W25	Closed
»	Factory configured - do not alter	W26	Unidentified
»	Power fail monitoring disabled	W29	Open
	Power fail monitoring enabled	W29	Closed
»	Power failure detection source external power fail (pin 6 on J12)	W39	Pins 1 & 2 closed
	Power failure detection source internal/external battery <3v	W39	Pins 2 & 3 closed
	Battery type select internal	W40	Pins 1 & 2 closed
	Battery type select external	W40	Pins 2 & 3 closed

SIMM CONFIGURATION
Size	Bank 0
1MB	(4) 256K x 9
4MB	(4) 1M x 9
16MB	(4) 4M x 9

SIMM CONFIGURATION
Size	Bank 1	Bank 2
1MB	(1) 256K x 36	None
2MB	(1) 256K x 36	(1) 256K x 36
3MB	(1) 512K x 36	(1) 256K x 36
4MB	(1) 1M x 36	None
4MB	(1) 512K x 36	(1) 512K x 36
5MB	(1) 1M x 36	(1) 256K x 36
6MB	(1) 1M x 36	(1) 512K x 36
8MB	(1) 2M x 36	None
8MB	(1) 1M x 36	(1) 1M x 36
9MB	(1) 2M x 36	(1) 256K x 36
10MB	(1) 2M x 36	(1) 512K x 36
12MB	(1) 2M x 36	(1) 1M x 36

SIMM CONFIGURATION (CON’T)
Size	Bank 1	Bank 2
16MB	(1) 4M x 36	None
16MB	(1) 2M x 36	(1) 2M x 36
17MB	(1) 4M x 36	(1) 256K x 36
18MB	(1) 4M x 36	(1) 512K x 36
20MB	(1) 4M x 36	(1) 1M x 36
24MB	(1) 4M x 36	(1) 2M x 36
32MB	(1) 8M x 36	None
32MB	(1) 4M x 36	(1) 4M x 36
33MB	(1) 8M x 36	(1) 256K x 36
34MB	(1) 8M x 36	(1) 512K x 36
36MB	(1) 8M x 36	(1) 1M x 36
40MB	(1) 8M x 36	(1) 2M x 36
48MB	(1) 8M x 36	(1) 4M x 36
64MB	(1) 8M x 36	(1) 8M x 36
Note: Memory installed in Banks 1 & 2 is interchangeable.

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
128KB	(4) 32K x 8	None	Unidentified
256KB	(4) 32K x 8	(4) 32K x 8	Unidentified
512KB	(4) 64K x 8	(4) 64K x 8	Unidentified

VIDEO MEMORY CONFIGURATION

Note: Board accepts 1MB/2MB video memory. The configuration is unidentified.

CPU SPEED SELECTION
Speed	W20
25MHz	Pins 3 & 4 closed
33MHz	Pins 1 & 2 closed
40MHz	Open
50iMHz	Pins 3 & 4 closed
50MHz	Pins 1 & 2, 3 & 4, 5 & 6 closed
66iMHz	Pins 1 & 2 closed
75iMHz	Pins 3 & 4 closed
100iMHz	Pins 1 & 2 closed
133MHz	Pins 1 & 2 closed

CPU TYPE SELECTION
Type	W2	W27	W28
80486DX	Open	Open	Open
80486DX2	Open	Open	Open
SL80486DX2	Open	Open	Pins 2 & 3 closed
AM486DX4 (2x)	Pins 1 & 2 closed	Open	Open
AM486DX4 (3x)	Open	Open	2 & 3
80486DX4 (2x)	Pins 1 & 2 closed	Open	Open
80486DX4 (3x)	Open	Open	2 & 3
AM486DX5	Pins 1 & 2 closed	Open	Open

CPU TYPE SELECTION
Type	W32	W34	W35	W36
80486DX	1 & 2, 3 & 4	Open	1 & 2	Open
80486DX2	1 & 2, 3 & 4	Open	1 & 2	Open
SL80486DX2	1 & 2, 3 & 4	2 & 3	1 & 2	1 & 2
AM486DX4 (2x)	1 & 2, 3 & 4	Open	2 & 3	Open
AM486DX4 (3x)	1 & 2, 3 & 4	2 & 3	2 & 3	1 & 2
80486DX4 (2x)	1 & 2, 3 & 4	Open	2 & 3	Open
80486DX4 (3x)	1 & 2, 3 & 4	2 & 3	2 & 3	1 & 2
AM486DX5	1 & 2, 3 & 4	Open	2 & 3	Open
Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION
Voltage	W1
3.3v	Open
5v	Closed

BUS SPEED SELECTION
Speed		W7
»	<= 33MHz	Open
	>33 MHz	Closed

DMA CHANNEL SELECTION
Channel		W17	W23
»	None	Open	Open
	0	Pins 1 & 2 closed	Pins 2 & 3 closed
	5	Pins 2 & 3 closed	Pins 1 & 2 closed

SERIAL PORT 2 LOOPBACK SELECTION
Setting		W9	W10
»	Normal	Open	Open
	Loopback	Closed	Closed

SERIAL PORT 2 SELECTION
Setting		W8	W11	W12	W13	W14
»	RS-232	Open	1 & 2	1 & 2	1 & 2	1 & 2
	RS-485	Closed	2 & 3	2 & 3	2 & 3	2 & 3
Note: Pins designated should be in the closed position.

FLOPPY DRIVE EDOUT SELECTION
Setting		W30
»	Left to software	Open
	Ground to pin 17 on J4, EDOUT to pin 29 on J4	Pins 1 & 3, 2 & 4 closed
	Ground to pin 29 on J4, EDOUT to pin 17 on J4	Pins 1 & 2, 3 & 4 closed

FLOPPY DRIVE HDOUT SELECTION
Setting		W31
»	Left to software	Open
	Ground to pin 27 on J4, HDOUT to pin 33 on J4	Pins 1 & 3, 2 & 4 closed
	Ground to pin 33 on J4, HDOUT to pin 27 on J4	Pins 1 & 2, 3 & 4 closed

BASE I/O SELECTION
Address		W16
»	190H	Pins 1 & 2, 3 & 4 closed
	290H	Pins 1 & 2 closed
	390H	Pins 3 & 4 closed
	390H	Open

VGA CONTROLLER SELECTION
Setting		W3	W4	W5	W6
	Enabled	Closed	Pins 1 & 2 closed	Closed	Pins 1 & 2 closed
»	Disabled	Open	Pins 2 & 3 closed	Open	Pins 2 & 3 closed