JETPRO INFOTECH COMPANY, LTD.
MB-6U(MB-450CBU)
Processor | 80386DX/80486SX/80487SX/80486DX/80486DX2 |
Processor Speed | 20/25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | UMC |
Max. Onboard DRAM | 64MB |
SRAM Cache | 64/256KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit proprietary local bus card |
NPU Options | 80387/3167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Reset switch | J5 | Power LED & keylock | J9 |
Turbo LED | J6 | External battery | J11 |
Turbo switch | J7 | 32-bit proprietary local bus card | S1 |
Speaker | J8 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | CMOS memory normal operation | W1 | closed |
CMOS memory clear | W1 | open | |
» | Monitor type select color | W2 | closed |
Monitor type select monochrome | W2 | open | |
» | Factory configured-do not alter | W3 | open |
» | Tag mode select write back enabled (tag installed at U45) | W15 | open |
Tag mode select write back disabled (tag not installed at U45) | W15 | 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 JUMPER CONFIGURATION | ||||||
Size | OSC2 | W5 | W10 | W11 | W19 | W22 |
80386DX/25 | 50MHz | open | N/A | N/A | open | N/A |
80386DX/33 | 66MHz | open | N/A | N/A | open | N/A |
80386DX/40 | 80MHz | open | N/A | N/A | open | N/A |
80486SX/20 | 20MHz | open | open | pins 1 & 2 | closed | 1 & 2 and 3 & 4 |
80486SX/20 | 40MHz | open | open | pins 2 & 3 | closed | 1 & 2 and 3 & 4 |
80487SX/20 | 20MHz | closed | pins 2 & 3 | pins 1 & 2 | closed | 1 & 2 and 3 & 4 |
80487SX/20 | 40MHz | closed | pins 2 & 3 | pins 2 & 3 | closed | 1 & 2 and 3 & 4 |
80486DX/25 | 25MHz | open | pins 1 & 2 | pins 1 & 2 | closed | 1 & 2 and 3 & 4 |
80486DX/25 | 50MHz | open | pins 1 & 2 | pins 2 & 3 | closed | 1 & 2 and 3 & 4 |
80486DX/33 | 33MHz | open | pins 1 & 2 | pins 1 & 2 | closed | 1 & 2 and 3 & 4 |
80486DX/33 | 66MHz | open | pins 1 & 2 | pins 2 & 3 | closed | 1 & 2 and 3 & 4 |
80486DX/50 | 50MHz | open | pins 1 & 2 | pins 1 & 2 | closed | 1 & 2 and 3 & 4 |
Note:Pins designated should be in the closed position |
NPU JUMPER CONFIGURATION | ||
Size | W8 | W20 |
80387 | closed | closed |
3167 | open | open |
SRAM JUMPER CONFIGURATION | ||||
Jumper | 32KB | 64KB | 128KB | 256KB |
W12 | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
W13 | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed |
W14 | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed |
W15 | open | open | open | open |
W17 | pins 2 & 3 closed | pins 1 & 2 closed | pins 2 & 3 closed | pins 1 & 2 closed |
W18 | N/A | N/A | pins 1 & 2 closed | pins 2 & 3 closed |
SRAM CONFIGURATION | |||
Size | Cache | Locations | TAG |
32KB | (4) 8K x 8 | Bank 0 | (4) 16K x 4 |
64KB | (8) 8K x 8 | Banks 0 & 1 | (4) 16K x 4 |
128KB | (4) 32K x 8 | Bank 0 | (4) 16K x 4 |
256KB | (8) 32K x 8 | Banks 0 & 1 | (4) 16K x 4 |