AMPRO COMPUTERS, INC.
LITTLE BOARD/486-II
| Device Type | Single Board Computer |
| Processor | 80486DX2/80486DX4 |
| Processor Speed | 66/100MHz |
| Chip Set | Unidentified |
| Maximum Onboard Memory | 32MB |
| Cache | Unidentified |
| BIOS | Award |
| Dimensions | 204mm x 146mm |
| I/O Options | Floppy drive interface, IDE interface, keyboard interface, parallel interface, PC/104 interfaces (2), SCSI interface, serial interfaces (2), utility interface |
CONNECTIONS |
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| Purpose | Location |
Purpose | Location |
| Power connector | J1 | SCSI interface | J7 |
| Serial interface 2 | J2 | Floppy drive interface | J8 |
| Serial interface 1 | J3 | IDE interface | J11 |
| Utility interface | J4 | PC/104 interface (8-bit) | P1 |
| Keyboard interface | J5 | PC/104 interface (16-bit) | P2 |
| Parallel interface | J6 | ||
USER CONFIGURABLE SETTINGS |
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Function |
Label |
Position |
|
| » | SCSI chip select enabled | W1 | Closed |
| SCSI chip select disabled | W1 | Open | |
| » | Factory configured - do not alter | W10 | Unidentified |
| » | Factory configured - do not alter | W11 | Pins 1 & 2, 3 & 4 closed |
| » | Factory configured - do not alter | W18 | Unidentified |
| » | Factory configured - do not alter | W19 | Open |
| » | Factory configured - do not alter | W21 | Unidentified |
| » | Powerfail NMI disabled | W23 | Open |
| Powerfail NMI enabled | W23 | Closed | |
| » | Factory configured - do not alter | W26 | Open |
| » | SCSI termination enabled | W28 | Closed |
| SCSI termination disabled | W28 | Open | |
SIMM CONFIGURATION |
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Size |
Bank 0 |
Bank 1 |
512KB |
(2) 256K x 9 | None |
1MB |
(2) 256K x 9 |
(2) 256K x 9 |
2MB |
(2) 1M x 9 |
None |
4MB |
(2) 1M x 9 |
(2) 1M x 9 |
8MB |
(2) 4M x 9 |
None |
16MB |
(2) 4M x 9 |
(2) 4M x 9 |
| 16MB | (2) 8M x 9 | None |
| 32MB | (2) 8M x 9 | (2) 8M x 9 |
| Note: Fast Page DRAM modules of 70ns or lower are supported. | ||
EPROM CONFIGURATION (S0) |
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EPROM |
W8 | W9 |
| 32K (27C256) | Open | 7 & 8, 10 & 11 |
| 64K (27C512) | Open | 1 & 4, 7 & 8, 10 & 11 |
| 128K (27C010) | Open | 1 & 4, 2 & 5, 6 & 9, 7 & 8 |
| 256K (27C020) | Open | 1 & 4, 2 & 5, 6 & 9, 7 & 8, 11 & 12 |
| 512K (27C040) | Open | 1 & 4, 2 & 3, 6 & 9, 7 & 8, 11 & 12 |
| 1MB (27C080) | Closed | 1 & 4, 2 & 3, 7 & 8, 11 & 12 |
Note: Pins designated should be in the closed position. |
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SRAM CONFIGURATION (S0) |
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SRAM |
W8 | W9 |
| 32K (62256) | Open | 4 & 7, 5 & 8, 10 & 11 |
| 128K (628128) | Open | 1 & 2, 4 & 7, 5 & 8, 10 & 11 |
| 512K (434000) | Open | 1 & 2, 3 & 6, 4 & 7, 5 & 8, 11 & 12 |
Note: Pins designated should be in the closed position. |
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FLASH EPROM CONFIGURATION (S0) |
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Flash EPROM |
W8 | W9 |
| 256K (28F256) | Open | 2 & 5, 6 & 9, 7 & 8 |
| 512K (28F512) | Open | 1 & 4, 2 & 5, 6 & 9, 7 & 8 |
| 128K (28F010) | Open | 1 & 4, 2 & 5, 6 & 9, 7 & 8 |
| 256K (28F020) | Open | 1 & 4, 2 & 5, 6 & 9, 7 & 8, 11 & 12 |
| 512K (28F040) | Open | 1 & 4, 2 & 5, 3 & 6, 7 & 8, 11 & 12 |
Note: Pins designated should be in the closed position. |
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EPROM CONFIGURATION (S1) |
|
EPROM |
W14 |
| 128K | Pins 3 & 4, 5 & 6 closed |
| 256K | Pins 3 & 4, 5 & 6 closed |
| 512K | Pins 3 & 4, 5 & 6 closed |
| 1MB | Pins 1 & 2, 5 & 6 closed |
FLASH EPROM CONFIGURATION (S1) |
|
Flash EPROM |
W14 |
| +12 volt 32K | Pins 3 & 4, 5 & 6 closed |
| +12 volt 64K | Pins 3 & 4, 5 & 6 closed |
| +12 volt 128K | Pins 3 & 4, 5 & 6 closed |
| +12 volt 256K | Pins 3 & 4, 5 & 6 closed |
| +5 volt 128K | Pins 3 & 7, 5 & 6 closed |
| +5 volt 256K | Pins 3 & 7, 5 & 6 closed |
| +5 volt 512K | Pins 3 & 7, 5 & 6 closed |
EPROM CONFIGURATION (S2) |
|
EPROM |
W15 |
| 128K | Pins 3 & 4, 5 & 6 closed |
| 256K | Pins 3 & 4, 5 & 6 closed |
| 512K | Pins 3 & 4, 5 & 6 closed |
| 1MB | Pins 1 & 2, 5 & 6 closed |
FLASH EPROM CONFIGURATION (S2) |
|
Flash EPROM |
W15 |
| +12 volt 32K | Pins 3 & 4, 5 & 6 closed |
| +12 volt 64K | Pins 3 & 4, 5 & 6 closed |
| +12 volt 128K | Pins 3 & 4, 5 & 6 closed |
| +12 volt 256K | Pins 3 & 4, 5 & 6 closed |
| +5 volt 128K | Pins 3 & 7, 5 & 6 closed |
| +5 volt 256K | Pins 3 & 7, 5 & 6 closed |
| +5 volt 512K | Pins 3 & 7, 5 & 6 closed |
FLASH PROGRAMMING SELECTION |
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Setting |
W7 | W16 | |
| » | +12 volt Flash programming power disabled |
Open | Open |
+12 volt Flash programming power enabled |
Closed | Closed | |
WATCHDOG TIMER CONFIGURATION |
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Setting |
W17 | |
| » | Watchdog timer is disabled | Open |
| Alarm causes I/O channel check | Pins 1 & 2 closed | |
| Alarm causes reset | Pins 2 & 3 closed | |
FLOPPY INTERFACE SELECTION |
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Setting |
W20 | W27 | |
| » | Floppy interface enabled |
Pins 1 & 2, 3 & 4 closed | Closed |
Floppy interface disabled |
Open | Open | |
PARALLEL PORT INTERRUPT SELECTION |
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IRQ |
W24 | |
| » | IRQ7 |
Pins 1 & 2 closed |
IRQ5 |
Pins 2 & 3 closed | |
| None | Open | |
SRAM BATTERY BACKUP SELECTION |
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Setting |
W2 | W25 | |
| » | Battery backup to S0 disabled |
Pins 2 & 3 closed | Pins 1 & 2 closed |
Battery backup to S0 enabled |
Pins 1 & 2 closed | Pins 2 & 3 closed | |
Note: The battery backup disabled setting makes the SRAM in S0 non-volatile. If an EPROM or Flash EPROM is used in S0, use the battery backup disabled setting which sets the power to S0 as Vcc. |
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TERMINATION POWER SELECTION |
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Setting |
W6 | |
| » | Termination power disabled |
Open |
TERMPWR supplied by SCSI interface pin 26 |
Closed | |
UTILITY CONNECTOR (J4) PIN CONFIGURATION |
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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 J9 pin B9 |
9 |
-5V power |
Connected to J9 pin B5 |
10 |
-12V power |
Connected to J9 pin B7 |
11 |
Ground |
Ground return |
| 12 | POWERGOOD |
Power supply status |