AMERICAN MEGATRENDS, INC.
ENTERPRISE-IV EISA VLB
Processor | 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive |
Processor Speed | 25/33/50(internal)/50/66(internal)MHz |
Chip Set | AMI |
Max. Onboard DRAM | 256MB |
Cache | 256KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, serial ports (2) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Serial port 1 | J2 | Power LED & keylock | J34 |
Serial port 2 | J3 | Turbo switch | J39 |
Parallel port | J4 | Speaker | J40 |
IDE interface LED | J5 | Reset switch | J41 |
Floppy drive interface | J6 | Turbo LED | J42 |
IDE interface | J9 | 32-bit VESA Local bus slot | S1 |
PS/2 mouse | J11 | 32-bit VESA Local bus slot | S2 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | Factory configured - do not alter | J10 | N/A |
» | Factory configured - do not alter | J21 | N/A |
» | CPU low priority | J31 | pins 1 & 2 closed |
CPU high priority | J31 | pins 2 & 3 closed | |
» | Factory configured - do not alter | J38 | N/A |
» | Factory configured - do not alter | SW1/switch 1 | Off |
» | Monitor type select monochrome | SW1/switch 2 | Off |
Monitor type select color | SW1/switch 2 | On |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
1MB | (1) 256K x 36 | None | None | None |
2MB | (1) 256K x 36 | (1) 256K x 36 | None | None |
4MB | (1) 1M x 36 | None | None | None |
6MB | (1) 256K x 36 | (1) 256K x 36 | (1) 1M x 36 | None |
8MB | (1) 1M x 36 | (1) 1M x 36 | None | None |
10MB | (1) 256K x 36 | (1) 256K x 36 | (1) 1M x 36 | (1) 1M x 36 |
12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
16MB | (1) 4M x 36 | None | None | None |
18MB | (1) 256K x 36 | (1) 256K x 36 | (1) 4M x 36 | None |
20MB | (1) 1M x 36 | (1) 4M x 36 | None | None |
24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x 36 | None |
32MB | (1) 4M x 36 | (1) 4M x 36 | None | None |
36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x 36 | None |
40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x 36 |
48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 | None |
64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 |
64MB | (1) 16M x 36 | None | None | None |
128MB | (1) 16M x 36 | (1) 16M x 36 | None | None |
192MB | (1) 16M x 36 | (1) 16M x 36 | (1) 16M x 36 | None |
256MB | (1) 16M x 36 | (1) 16M x 36 | (1) 16M x 36 | (1) 16M x 36 |
CPU SPEED CONFIGURATION | |||
Speed | J12 | J13 | J14 |
25MHz | Open | Open | Open |
33MHz | Open | Closed | Open |
50i MHz | Open | Open | Open |
50MHz | Closed | Open | Closed |
66i MHz | Open | Closed | Open |
CPU TYPE CONFIGURATION | ||||
PGA CPU | PQFP CPU | J15 | J16 | J43 |
None | 80486SX,80486DX | N/A | N/A | Open |
ODP486SX, 80487SX, ODP586SX | 80486SX,80486DX | 1&2, 3&4 | pins 2 & 3 | Closed |
ODP486SX, 80487SX, ODP586SX | None | 1&2, 3&4 | pins 2 & 3 | N/A |
80486DX, 80486DX2 | None | 1&2, 3&4 | pins 1 & 2 | N/A |
80486DX, 80486DX2 | 80486SX,80486DX | 1&2, 3&4 | pins 1 & 2 | Closed |
80486SX | None | pins 2 & 3 | N/A | N/A |
80486SX | 80486SX,80486DX | pins 2 & 3 | N/A | Closed |
Note:Pins designated should be in the closed position. |
SERIAL PORT INTERRUPT SELECTION | ||||
Port 1 (J2) | Port 2 (J3) | J22 | J23 | |
» | IRQ4 | IRQ3 | pins 2 & 3 closed | pins 1 & 2 closed |
IRQ3 | IRQ4 | pins 1 & 2 closed | pins 2 & 3 closed |