AMPRO COMPUTERS, INC.
LITTLE BOARD/486
Processor | 80486SX/80487SX/80486DX |
Processor Speed | 20/33MHz |
Chip Set | Ampro |
Max. onboard DRAM | 16MB |
Cache | 32KB optional (location unknown) |
BIOS | Award |
Dimensions | 330mm x 218mm |
I/O Options | Floppy drive interface, IDE interface, parallel port, SCSI connector, serial ports (2) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Power connector | J1 | Parallel port | J6 |
Serial port (COM2) | J2 | SCSI interface | J7 |
Serial port (COM1) | J3 | Floppy drive interface | J8 |
Utility connector | J4 | IDE interface | J11 |
Keyboard | J5 | Power J1-1 to +12V BUS | W7 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | SCSI controller enabled | W1 | Closed |
SCSI controller disabled | W1 | Open | |
» | Factory configured - do not alter | W3 | N/A |
» | SCSI controller select IRQ15 | W5 | Open |
SCSI controller select IRQ11 | W5 | Closed | |
» | SCSI termination power enabled | W6 | Open |
SCSI termination power disabled | W6 | Closed | |
» | Factory configured - do not alter | W10 | Closed |
» | Factory configured - do not alter | W11 | pins 1 & 2 closed |
» | Flash EPROM programming power enabled | W16 | Open |
Flash EPROm programming power disabled | W16 | Closed | |
» | Watchdog timer select I/O CHCK | W17 | pins 1 & 2 closed |
Watchdog timer select reset | W17 | pins 2 & 3 closed | |
Watchdog timer disabled | W17 | Open | |
» | Floppy drive interface enabled | W18 | Open |
Floppy drive interface disabled | W18 | Closed | |
» | Floppy precompensation (PCVAL) selection | W19 | Open |
Floppy precompensation (PCVAL) none | W19 | Closed | |
» | Floppy drive select IRQ6 | W20 & W27 | Closed |
Floppy drive select IRQ6 disabled | W20 & W27 | Open | |
» | External cache enabled | W21 | Open |
External cache disabled | W21 | Closed | |
» | Factory configured - do not alter | W22 | N/A |
» | Power fail NMI enabled | W23 | Open |
Power fail NMI disabled | W23 | Closed | |
» | Parallel port interrrupt option select via setup | W24 | Open |
Parallel port interrrupt option disabled | W24 | Closed | |
Note: W18 may either be an option or is not user configurable. |
DRAM CONFIGURATION | |
Size | Bank 0 |
1MB | (4) 256K x 9 |
4MB | (4) 1M x 9 |
16MB | (4) 4M x 9 |
CACHE CONFIGURATION | |||||
Cache | DRAM | U9 | U10 | Tag U12 | Tag U13 |
32KB | 4MB | (2) 8K x 8 | (2) 8K x 8 | (2) 8K x 8 | NONE |
32KB | 16MB | (2) 8K x 8 | (2) 8K x 8 | (2) 8K x 8 | (2) 8K x 8 |
EPROM CONFIGURATION (S0) | |||
EPROM | W8 | W9 | W25 |
27C256 | Open | pins 7 & 8, 10 & 11 | pins 1 & 2 |
27C512 | Open | pins 1 & 4, 7 & 8, 10 & 11 | pins 1 & 2 |
27C010 | Open | pins 1 & 4, 2 & 5, 6 & 9, 7 & 8 | pins 1 & 2 |
27C020 | Open | pins 1 & 4, 2 & 5, 6 & 9, 7 & 8, 11 & 12 | pins 1 & 2 |
27C040 | Open | pins 1 & 4, 2 & 3, 6 & 9, 7 & 8, 11 & 12 | pins 1 & 2 |
27C080 | Closed | pins 1 & 4, 2 & 3, 7 & 8, 11 & 12 | pins 1 & 2 |
62256 | Open | pins 4 & 7, 5 & 8, 10 & 11 | pins 1 & 2 or 2 & 3 |
628128 | Open | pins 1 & 2, 4 & 7, 5 & 8, 10 & 11 | pins 1 & 2 or 2 & 3 |
uPD434000 | Open | pins 1 & 2, 3 & 6, 4 & 7, 5 & 8, 11 & 12 | pins 1 & 2 or 2 & 3 |
28F256 | Open | pins 2 & 5, 6 & 9, 7 & 8 | pins 1 & 2 |
28F512 | Open | pins 1 & 4, 2 & 5, 6 & 9, 7 & 8 | pins 1 & 2 |
28F010 | Open | pins 1 & 4, 2 & 5, 6 & 9, 7 & 8 | pins 1 & 2 |
28F020 | Open | pins 1 & 4, 2 & 5, 6 & 9, 7 & 8, 11 & 12 | pins 1 & 2 |
Note:Pins designated should be in the closed position. |
EPROM/FLASH EPROM CONFIGURATION (S1 & S2) | ||||
EPROM | W12 | W13 | W14 | W15 |
128KB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
256KB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
SCSI CONTROLLER CONFIGURATION | ||
DMA | W2 | W4 |
6 | pins 1 & 2 closed | Open |
0 | pins 2 & 3 closed | Closed |
UTILITY CONNECTOR (J4) PIN CONFIGURATION | ||
Pin | Signal Name | Function |
1 | Speaker | Audio signal |
2 | Speaker | Ground |
3 | Ground | To one side of Reset button |
4 | Reset | To other side of Reset button |
5 | LED Cathode | Ground return |
6 | LED anode | Current source (+5v through 330 ohms) |
7 | Ground | Ground return |
8 | +12V power | Connected to P1 pin B9 |
9 | -5V power | Connected to P1 pin B5 |
10 | -12V power | Connected to P1 pin B7 |
11 | Ground | Ground return |
12 | POWERGOOD | Power supply status |
WATCHDOG TIMER CONFIGURATION | ||
Setting | W17 | W23 |
Disabled | Open | Open |
IOCHCK (NMI) | Pins 1 & 2 closed | Open |
Reset | pins 2 & 3 closed | N/A |
Note:I/O channel check is the bus signal that triggers a non-maskable interrupt (NMI) Reset is a hard reset signal, the same as pressing the reset button. |