* Indicates default value.
| Jumper | Pin/Setting | Description |
|---|---|---|
| J8 (JPWDCLR) | Closed Open | Clear Password * Normal Operation |
| J9 (Jcol) | Closed Open | * Colour Monochrome |
| J12 (Jirq9) IRQ 9 Enable | Closed Open | * Enable Disable |
| J13 (Jio) I/O Controller | 1-2 2-3 | Disabled * Enabled |
| J14 (Jbte) Boot Select | 1-2 2-3 | Boot Block * Normal |
| J15 (Jvgae) On-board VGA | 1-2 2-3 | Disabled * Enabled |
| J16 (Jpare) Parity Chcking | 1-2 2-3 | * Enabled Disabled |
| J23/J25 External Cache | Any 1-2 2-3 | No Cache 128kb/512kb 256kb |
| J25 (Jcsize) Cache Size | Any OPEN 1-2 1-2, 3-4 | No Cache 128kb 256kb 512kb |
| J27 (Jdak) | 1-2 2-3 | * Channel 1 Channel 3 |
| J30 (Jeride) | 1-2 3-4 | * Enabled Disabled |
| J31 (Jbte) Onboard Battery | 3-4 OPEN | * Enabled Disabled |
| J32 (Jsel) | 1-2 2-3 | 25MHz 33MHz |
| J33 (Jsx) | 1-2. 3-4 5-6 | All other CPUs * SX CPU |
| J34 (Jret) | 1-2 3-4 | Reserved * All CPU |
| J35 (Jldev) | CLOSED OPEN | * Enabled Disabled |
| J36 (j3.3v) | 1-2, 3-4 3-5, 4-6 | 3.3v CPU * 5v CPU |
| J37 (Jmul) P24C Clock | No Jumper 1-2 3-4 | * X3 Internal Clock Other Multiplier X2 Internal Clock |
| J40 (Jspk) Onboard Speaker | Closed Open | * Enabled Disabled |
Note - J23 & J25 are ignored if no ext. cache is installed. Both jumpers must be set the same.
Uses a 3.6 volt lithium battery. Remove the jumper on pins 3-4 of J31 (Jbte) battery connector. The battery connector is keyed and will only go in one way.
Tag and DB Ram are 15ns. Cache Ram is 20ns. See jumpers section for necessary jumper changes.
| Cache Chip Type | 128K | 256K | 512K |
|---|---|---|---|
| Tag SRAM (U50) | One 32Kx8 | One 32Kx8 | One 32Kx8 |
| DB SRAM (U65/66) | One 64Kx1 | One 64Kx1 | One 64Kx1 |
| Cache (U60,61,62,63,U46,47,48,49) | Four 32Kx8 | Eight 128Kx8 | Four 128Kx8 |
Uses 237 pin type 3 socket. To open the upgrade processor socket, pull the tab/lever straight up from the side of the socket (closest to the back of the motherboard) and pull towards the front. The following jumpers are used :
| Upgrade Socket | J32 CLK SPD | J33 CPU SX | J34 P24T OR S | J36 CPU V | J37 P24C MUL |
|---|---|---|---|---|---|
| 80486SX-25 | 1-2 | 5-6 | 2-3 | 3-5,4-6 | 2-3 |
| 80486SX-33 | 2-3 | 5-6 | 2-3 | 3-5,4-6 | 2-3 |
| 80486SX2-50 | 1-2 | 1-2,3-4 | 2-3 | 3-5,4-6 | 2-3 |
| 80486SX2-66 | 2-3 | 1-2,3-4 | 2-3 | 3-5,4-6 | 2-3 |
| 80486DX-25 | 1-2 | 1-2,3-4 | 2-3 | 3-5,4-6 | 2-3 |
| 80486DX-33 | 2-3 | 1-2,3-4 | 2-3 | 3-5,4-6 | 2-3 |
| 80486DX2-50 | 1-2 | 1-2,3-4 | 2-3 | 3-5,4-6 | 2-3 |
| 80486DX2-66 | 2-3 | 1-2,3-4 | 2-3 | 3-5,4-6 | 2-3 |
| 80486DX4-100 | 2-3 | 1-2,3-4 | 2-3 | 1-3,2-4 | 2-3 |
| P24T | 1-2 | 1-2,3-4 | 2-3 | 3-5,4-6 | 2-3 |
The DX4-120 CPU requires a 486 system to be able to run at 40 MHz clock speed. This motherboard have not been qualified to run at that speed. However, they will run at 33 MHz which will yield 100 MHz DX4 speed.
SIMM speed must be 70ns or faster. This system has four SIMM sockets which are labelled SIMM1, SIMM2, SIMM3 and SIMM4. The SIMM's are 1/2/4/8/16/32MB 72-pin and can be x32 or x36. The motherboard design does not require parity checking, hence x32 SIMMs can be purchased. The SMT memory is automatically disabled when all four SIMM sockets are occupied.
Use an 8 ohm, .5 watt computer speaker. Remove the jumper on pins 3-4 of the J40 (Jspk) connector. The Speaker will connect to pins 1 and 4. (pin 1= +5 volts, pin 4= speaker ground)