TEXT View Source
# ABC COMPUTER COMPANY, LTD.
A4865
Processor 80486DX
Processor Speed 33MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64/128/256/512KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card slot
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J10 | Turbo LED | JP12 |
|---------------------+----------+----------------+----------|
| Power LED & Keylock | J23 | Reset switch | SW1 |
|---------------------+----------+----------------+----------|
| Speaker | J24 | Turbo switch | SW2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+--------+-------------|
| » | Monitor type select color | JP1 | Closed |
|---+---------------------------------+--------+-------------|
| | Monitor type select monochrome | JP1 | Open |
|---+---------------------------------+--------+-------------|
| » | CMOS memory normal operation | JP2 | pins 2 & 3 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | CMOS memory clear | JP2 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| » | Normal operation - do not alter | JP205 | Open |
|---+---------------------------------+--------+-------------|
| | Factory test (system burn in) | JP205 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+------------+----------+----------+-----------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|-------+------------+----------+----------+-----------------|
| 8MB | (4) 1M x 9 | (4) 1M x | NONE | NONE |
| | | 9 | | |
|-------+------------+----------+----------+-----------------|
| 12MB | (4) 1M x 9 | (4) 1M x | (4) 1M x | NONE |
| | | 9 | 9 | |
|-------+------------+----------+----------+-----------------|
| 16MB | (4) 1M x 9 | (4) 1M x | (4) 1M x | (4) 1MB x 9 |
| | | 9 | 9 | |
|-------+------------+----------+----------+-----------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|-------+------------+----------+----------+-----------------|
| 20MB | (4) 1M x 9 | (4) 4M x | NONE | NONE |
| | | 9 | | |
|-------+------------+----------+----------+-----------------|
| 24MB | (4) 1M x 9 | (4) 1M x | (4) 4M x | NONE |
| | | 9 | 9 | |
|-------+------------+----------+----------+-----------------|
| 28MB | (4) 1M x 9 | (4) 1M x | (4) 4M x | (4) 1M x 9 |
| | | 9 | 9 | |
|-------+------------+----------+----------+-----------------|
| 32MB | (4) 4M x 9 | (4) 4M x | NONE | NONE |
| | | 9 | | |
|-------+------------+----------+----------+-----------------|
| 36MB | (4) 1M x 9 | (4) 4M x | (4) 4M x | NONE |
| | | 9 | 9 | |
|-------+------------+----------+----------+-----------------|
| 40MB | (4) 1M x 9 | (4) 1M x | (4) 4M x | (4) 4M x 9 |
| | | 9 | 9 | |
|-------+------------+----------+----------+-----------------|
| 48MB | (4) 4M x 9 | (4) 4M x | (4) 4M x | NONE |
| | | 9 | 9 | |
|-------+------------+----------+----------+-----------------|
| 52MB | (4) 1M x 9 | (4) 4M x | (4) 4M x | (4) 4M x 9 |
| | | 9 | 9 | |
|-------+------------+----------+----------+-----------------|
| 64MB | (4) 4M x 9 | (4) 4M x | (4) 4M x | (4) 4M x 9 |
| | | 9 | 9 | |
|------------------------------------------------------------|
| Note:Banks 2 & 3 are utilized when a 32-bit external |
| memory card is installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Tag | Dirty Bit |
|-------+-------------+------------+------------+------------|
| 64KB | (8) 8K x 8 | NONE | (1) 8K x 8 | (1) 64K x |
| | | | | 1 |
|-------+-------------+------------+------------+------------|
| 128KB | (8) 8K x 8 | (8) 8K x 8 | (1) 8K x 8 | (1) 64K x |
| | | | | 1 |
|-------+-------------+------------+------------+------------|
| 256KB | (8) 32K x 8 | NONE | (1) 32K x | (1) 64K x |
| | | | 8 | 1 |
|-------+-------------+------------+------------+------------|
| 512KB | (8) 32K x 8 | (8) 32K x | (1) 32K x | (1) 64K x |
| | | 8 | 8 | 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP10 | JP11 | JP206 |
|-------+--------+--------+--------+--------+----------------|
| 64KB | open | open | open | open | pins 2 & 3 |
| | | | | | closed |
|-------+--------+--------+--------+--------+----------------|
| 128KB | closed | open | open | closed | pins 2 & 3 |
| | | | | | closed |
|-------+--------+--------+--------+--------+----------------|
| 256KB | closed | closed | open | closed | pins 2 & 3 |
| | | | | | closed |
|-------+--------+--------+--------+--------+----------------|
| 512KB | closed | closed | closed | closed | pins 1 & 2 |
| | | | | | closed |
+------------------------------------------------------------+