JETPRO INFOTECH COMPANY, LTD.
MB-4F
Processor | 80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2 |
Processor Speed | 20/25/33/40/50(internal)/66(internal) |
Chip Set | FOREX |
Max. Onboard DRAM | 32MB |
SRAM Cache | 64/128/256KB |
BIOS | AMI/AWARD |
Dimensions | 220mm x 340mm |
I/O Options | None |
NPU Options | 80387 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | JP2 | Turbo switch | JP15 |
Reset switch | JP8 | Turbo LED | JP16 |
Power LED & keylock | JP14 | Speaker | JP17 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Parity check enabled | JP5 | closed |
Parity check disabled | JP5 | open | |
» | Monitor type select color | JP6 | closed |
Monitor type select monochrome | JP6 | open | |
» | Factory configured - do not alter | JP19 | open |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
1MB | (4) 256K x 9 | NONE |
2MB | (4) 256K x 9 | (4) 256K x 9 |
4MB | (4) 1M x 9 | NONE |
5MB | (4) 256K x 9 | (4) 1M x 9 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
20MB | (4) 1M x 9 | (4) 4M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
CPU TYPE CONFIGURATION | |||||
CPU | JP12 | JP13 | JP30 | W1A-W1G | W2A-W2H |
80486DX2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
80486DX | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
80487SX | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
80486SX | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
80386DX | N/A | N/A | N/A | pins 2 & 3 | pins 2 & 3 |
Note:Pins designated should be in the closed position. |
SRAM CONFIGURATION | ||||
Size | Cache SRAM | Location | TAG(U26) | TAG(U42) |
64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 | NONE |
128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 | NONE |
256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 8K x 8 | (1) 8K x 8 |
Note:The exact locations of U26 and U42 are unknown. |
SRAM JUMPER CONFIGURATION | ||||||
Size | JP8A | JP8B | JP8C | JP8D | JP8E | JP8F |
64KB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
128KB | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
256KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
Note:Pins designated should be in the closed position. |