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# AMPRO COMPUTERS, INC.
LITTLE BOARD/486
Processor 80486SX/80487SX/80486DX
Processor 20/33MHz
Speed
Chip Set Ampro
Max. onboard 16MB
DRAM
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
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power connector | J1 | Parallel port | J6 |
|-------------------+----------+------------------+----------|
| Serial port | J2 | SCSI interface | J7 |
| (COM2) | | | |
|-------------------+----------+------------------+----------|
| Serial port | J3 | Floppy drive | J8 |
| (COM1) | | interface | |
|-------------------+----------+------------------+----------|
| Utility connector | J4 | IDE interface | J11 |
|-------------------+----------+------------------+----------|
| Keyboard | J5 | Power J1-1 to | W7 |
| | | +12V BUS | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | SCSI controller enabled | W1 | Closed |
|---+---------------------------+---------------+------------|
| | SCSI controller disabled | W1 | Open |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W3 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | SCSI controller select | W5 | Open |
| | IRQ15 | | |
|---+---------------------------+---------------+------------|
| | SCSI controller select | W5 | Closed |
| | IRQ11 | | |
|---+---------------------------+---------------+------------|
| » | SCSI termination power | W6 | Open |
| | enabled | | |
|---+---------------------------+---------------+------------|
| | SCSI termination power | W6 | Closed |
| | disabled | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W10 | Closed |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W11 | pins 1 & 2 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Flash EPROM programming | W16 | Open |
| | power enabled | | |
|---+---------------------------+---------------+------------|
| | Flash EPROm programming | W16 | Closed |
| | power disabled | | |
|---+---------------------------+---------------+------------|
| » | Watchdog timer select I/O | W17 | pins 1 & 2 |
| | CHCK | | closed |
|---+---------------------------+---------------+------------|
| | Watchdog timer select | W17 | pins 2 & 3 |
| | reset | | closed |
|---+---------------------------+---------------+------------|
| | Watchdog timer disabled | W17 | Open |
|---+---------------------------+---------------+------------|
| » | Floppy drive interface | W18 | Open |
| | enabled | | |
|---+---------------------------+---------------+------------|
| | Floppy drive interface | W18 | Closed |
| | disabled | | |
|---+---------------------------+---------------+------------|
| » | Floppy precompensation | W19 | Open |
| | (PCVAL) selection | | |
|---+---------------------------+---------------+------------|
| | Floppy precompensation | W19 | Closed |
| | (PCVAL) none | | |
|---+---------------------------+---------------+------------|
| » | Floppy drive select IRQ6 | W20 & W27 | Closed |
|---+---------------------------+---------------+------------|
| | Floppy drive select IRQ6 | W20 & W27 | Open |
| | disabled | | |
|---+---------------------------+---------------+------------|
| » | External cache enabled | W21 | Open |
|---+---------------------------+---------------+------------|
| | External cache disabled | W21 | Closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W22 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Power fail NMI enabled | W23 | Open |
|---+---------------------------+---------------+------------|
| | Power fail NMI disabled | W23 | Closed |
|---+---------------------------+---------------+------------|
| » | Parallel port interrrupt | W24 | Open |
| | option select via setup | | |
|---+---------------------------+---------------+------------|
| | Parallel port interrrupt | W24 | Closed |
| | option disabled | | |
|------------------------------------------------------------|
| 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 | (2) 8K x | NONE |
| | | | 8 | 8 | |
|-------+------+------------+----------+----------+----------|
| 32KB | 16MB | (2) 8K x 8 | (2) 8K x | (2) 8K x | (2) 8K x |
| | | | 8 | 8 | 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 & | pins 1 & 2 |
| | | 11 | |
|-----------+--------+-------------------------+-------------|
| 27C010 | Open | pins 1 & 4, 2 & 5, 6 & | pins 1 & 2 |
| | | 9, 7 & 8 | |
|-----------+--------+-------------------------+-------------|
| 27C020 | Open | pins 1 & 4, 2 & 5, 6 & | pins 1 & 2 |
| | | 9, 7 & 8, 11 & 12 | |
|-----------+--------+-------------------------+-------------|
| 27C040 | Open | pins 1 & 4, 2 & 3, 6 & | pins 1 & 2 |
| | | 9, 7 & 8, 11 & 12 | |
|-----------+--------+-------------------------+-------------|
| 27C080 | Closed | pins 1 & 4, 2 & 3, 7 & | pins 1 & 2 |
| | | 8, 11 & 12 | |
|-----------+--------+-------------------------+-------------|
| 62256 | Open | pins 4 & 7, 5 & 8, 10 & | pins 1 & 2 |
| | | 11 | or 2 & 3 |
|-----------+--------+-------------------------+-------------|
| 628128 | Open | pins 1 & 2, 4 & 7, 5 & | pins 1 & 2 |
| | | 8, 10 & 11 | or 2 & 3 |
|-----------+--------+-------------------------+-------------|
| uPD434000 | Open | pins 1 & 2, 3 & 6, 4 & | pins 1 & 2 |
| | | 7, 5 & 8, 11 & 12 | or 2 & 3 |
|-----------+--------+-------------------------+-------------|
| 28F256 | Open | pins 2 & 5, 6 & 9, 7 & | pins 1 & 2 |
| | | 8 | |
|-----------+--------+-------------------------+-------------|
| 28F512 | Open | pins 1 & 4, 2 & 5, 6 & | pins 1 & 2 |
| | | 9, 7 & 8 | |
|-----------+--------+-------------------------+-------------|
| 28F010 | Open | pins 1 & 4, 2 & 5, 6 & | pins 1 & 2 |
| | | 9, 7 & 8 | |
|-----------+--------+-------------------------+-------------|
| 28F020 | Open | pins 1 & 4, 2 & 5, 6 & | pins 1 & 2 |
| | | 9, 7 & 8, 11 & 12 | |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EPROM/FLASH EPROM CONFIGURATION (S1 & S2) |
|------------------------------------------------------------|
| EPROM | W12 | W13 | W14 | W15 |
|-------+-------------+------------+------------+------------|
| 128KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | 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. |
+------------------------------------------------------------+