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# GEMLIGHT COMPUTER, LTD.
GMB-486UNP (VER. 3.01)
Processor CX486S(WB)/CX486S(WT)/CX486S2(WB)/CX486S2(WT)/80486SX/
80487SX/CX486DX(WB)/CX486DX(WT)/CX486DX2(WB)/CX486DX2(WT)/80486DX/80486DX2
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set Unidentified
Video Chip None
Set
Maximum 128MB
Onboard
Memory
Maximum None
Video
Memory
Cache 32/64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (3)
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+------------+----------------+-----------|
| External battery | J2 | Turbo switch | J51 pins |
| | | | 15 - 17 |
|------------------+------------+----------------+-----------|
| Power LED & | J51 pins 1 | Reset switch | J51 pins |
| keylock | - 5 | | 19 & 20 |
|------------------+------------+----------------+-----------|
| Speaker | J51 pins 7 | 32-bit VESA | SL1 - SL3 |
| | - 10 | local bus | |
| | | slots | |
|------------------+------------+----------------+-----------|
| Turbo LED | J51 pins | | |
| | 12 & 13 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Monitor type select color | JP32 | Closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | JP32 | Open |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP33 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP33 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP74 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP75 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP76 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP77 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | VL-BUS clock adjust normal | JP118 | Pins 1 & 2 |
| | operation | | closed |
|---+---------------------------------+-------+--------------|
| | VL-BUS clock adjust reserved | JP118 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP121 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP122 | Pins 1 & 2 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP123 | Open |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP124 | Open |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP125 | Open |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JXN | Pins 1 & 2 |
| | alter | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | None |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | None |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | None |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | None |
|------------------+--------------------+--------------------|
| 80MB | (4) 16M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 32KB | (4) 8K x 8 | None | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | None | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5 | JP7 | JP58 |
|----------+-----------+----------+--------------------------|
| 32KB | Open | Open | Pins 2 & 3 closed |
|----------+-----------+----------+--------------------------|
| 64KB | Closed | Open | Pins 1 & 2 closed |
|----------+-----------+----------+--------------------------|
| 128KB | Closed | Closed | Pins 1 & 2, 3 & 4 closed |
|----------+-----------+----------+--------------------------|
| 256KB | Closed | Closed | Pins 1 & 2, 4 & 5 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP34 | JP35 | JP36 |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 40MHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP25 | JP28 | JP30 |
|----------------+--------+------+---------------------------|
| CX486S (WB) | Closed | Open | Pins 5 & 6 closed |
|----------------+--------+------+---------------------------|
| CX486S (WT) | Closed | Open | Pins 5 & 6 closed |
|----------------+--------+------+---------------------------|
| CX486S2 (WB) | Closed | Open | Pins 5 & 6 closed |
|----------------+--------+------+---------------------------|
| CX486S2 (WT) | Closed | Open | Pins 5 & 6 closed |
|----------------+--------+------+---------------------------|
| 80486SX (PQFP) | Open | Open | Open |
|----------------+--------+------+---------------------------|
| 80486SX (PGA) | Closed | Open | Pins 5 & 6 closed |
|----------------+--------+------+---------------------------|
| 80487SX | Closed | Open | Pins 1 & 2, 4 & 5, 6 & 7 |
| | | | closed |
|----------------+--------+------+---------------------------|
| CX486DX (WB) | Closed | Open | Pins 2 & 3, 4 & 5, 6 & 7 |
| | | | closed |
|----------------+--------+------+---------------------------|
| CX486DX (WT) | Closed | Open | Pins 2 & 3, 4 & 5, 6 & 7 |
| | | | closed |
|----------------+--------+------+---------------------------|
| CX486DX2 (WB) | Closed | Open | Pins 2 & 3, 4 & 5, 6 & 7 |
| | | | closed |
|----------------+--------+------+---------------------------|
| CX486DX2 (WT) | Closed | Open | Pins 2 & 3, 4 & 5, 6 & 7 |
| | | | closed |
|----------------+--------+------+---------------------------|
| 80486DX | Closed | Open | Pins 2 & 3, 4 & 5, 6 & 7 |
| | | | closed |
|----------------+--------+------+---------------------------|
| 80486DX2 | Closed | Open | Pins 2 & 3, 4 & 5, 6 & 7 |
| | | | closed |
|----------------+--------+------+---------------------------|
| P24T | Closed | Open | Pins 1 & 2, 4 & 5, 6 & 7 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CON’T) |
|------------------------------------------------------------|
| Type | JP70 | JP72 | JP80 | JP120 |
|-----------+-------------+------------+------------+--------|
| CX486S | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 | Open |
| (WB) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| CX486S | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 | Open |
| (WT) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| CX486S2 | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 | Closed |
| (WB) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| CX486S2 | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 | Closed |
| (WT) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| 80486SX | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 | Open |
| (PQFP) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| 80486SX | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 | Open |
| (PGA) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| 80487SX | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 | Open |
| | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| CX486DX | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 | Open |
| (WB) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| CX486DX | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 | Open |
| (WT) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| CX486DX2 | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 | Closed |
| (WB) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| CX486DX2 | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 | Closed |
| (WT) | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| 80486DX | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 | Open |
| | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| 80486DX2 | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 | Open |
| | closed | closed | closed | |
|-----------+-------------+------------+------------+--------|
| P24T | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 | Open |
| | closed | closed | closed | |
+------------------------------------------------------------+