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# SEE-THRU DATA SYSTEMS, LTD.
STO98C
Processor 80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
Processor 20/25/33/40/50(internal)/50/66(internal)
Speed
Chip Set OPTI
Max. Onboard 32MB
DRAM
SRAM Cache 64/128/256KB
BIOS MR
Dimensions 220mm x 220mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J9 | Turbo switch | JP12 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J18 | Turbo LED | JP13 |
|---------------------+----------+----------------+----------|
| Speaker | JP11 | Reset switch | S1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | Monitor type select monochrome | JP1 | open |
|---+--------------------------------+--------+--------------|
| | Monitor type select color | JP1 | closed |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP2 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP2 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location | TAG | TAG | Dirty |
| | | | (U31) | (U32) | Bit |
| | | | | | (U42) |
|-------+--------+----------+----------+----------+----------|
| 64KB | (8) 8K | Banks 0 | NONE | (1) 8K x | (1) 16K |
| | x 8 | & 1 | | 8 | x 4 |
|-------+--------+----------+----------+----------+----------|
| 128KB | (4) | Bank 0 | NONE | (1) 8K x | (1) 16K |
| | 32K x | | | 8 | x 4 |
| | 8 | | | | |
|-------+--------+----------+----------+----------+----------|
| 128KB | (4) | Bank 0 | NONE | (1) 32K | (1) 16K |
| | 32K x | | | x 8 | x 4 |
| | 8 | | | | |
|-------+--------+----------+----------+----------+----------|
| 256KB | (8) | Banks 0 | NONE | (1) 32K | (1) 16K |
| | 32K x | & 1 | | x 8 | x 4 |
| | 8 | | | | |
|-------+--------+----------+----------+----------+----------|
| 256KB | (8) | Banks 0 | (1) 8K x | (1) 8K x | (1) 16K |
| | 32K x | & 1 | 8 | 8 | x 4 |
| | 8 | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 | JP7 | JP8 |
|-----------+---------------+------------+---------+---------|
| 64KB | pins 2 & 3 | pins 2 & 3 | open | open |
| | closed | closed | | |
|-----------+---------------+------------+---------+---------|
| 128KB | pins 1 & 2 | pins 1 & 2 | closed | open |
| | closed | closed | | |
|-----------+---------------+------------+---------+---------|
| 128KB | pins 1 & 2 | pins 1 & 2 | closed | open |
| | closed | closed | | |
|-----------+---------------+------------+---------+---------|
| 256KB | pins 2 & 3 | pins 2 & 3 | closed | open |
| | closed | closed | | |
|-----------+---------------+------------+---------+---------|
| 256KB 1 | pins 2 & 3 | pins 2 & 3 | open | closed |
| | closed | closed | | |
|------------------------------------------------------------|
| Note 1 :Jumpers are in this position only when using (2) |
| 8K x 8 in TAG sockets U31 & U32. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------------------------------------------------|
| Note:8 or 9-bit SIMMs can be used. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JF0 | JF1 | JP6 | JP10 |
|-------------------+--------+--------+-----------+----------|
| 20MHz | closed | closed | pins 2 & | open |
| | | | 3 closed | |
|-------------------+--------+--------+-----------+----------|
| 25MHz | open | closed | pins 2 & | open |
| | | | 3 closed | |
|-------------------+--------+--------+-----------+----------|
| 33MHz(386/486DLC) | closed | open | pins 2 & | pins 1 & |
| | | | 3 closed | 2 closed |
|-------------------+--------+--------+-----------+----------|
| 33MHz(486) | closed | open | pins 2 & | open |
| | | | 3 closed | |
|-------------------+--------+--------+-----------+----------|
| 40MHz | open | open | pins 2 & | pins 1 & |
| | | | 3 closed | 2 closed |
|-------------------+--------+--------+-----------+----------|
| 50MHz (internal) | open | closed | pins 2 & | open |
| | | | 3 closed | |
|-------------------+--------+--------+-----------+----------|
| 50MHz | open | closed | pins 1 & | pins 2 & |
| | | | 2 closed | 3 closed |
|-------------------+--------+--------+-----------+----------|
| 66MHz (internal) | closed | open | pins 2 & | open |
| | | | 3 closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP5 | JP9 | JP14 | JP15 | JP16 | JP17 |
|----------+-------+--------+-------+-------+-------+--------|
| 80386DX | 1 & | 1 & 2, | 1 & 2 | 1 & 2 | 2 & | closed |
| | 2, 3 | 3 & 4 | | | 3, 4 | |
| | & 4 | | | | & 5 | |
|----------+-------+--------+-------+-------+-------+--------|
| CX486DLC | 1 & | 1 & 2, | 1 & 2 | 1 & 2 | 2 & | closed |
| | 2, 3 | 3 & 4 | | | 3, 4 | |
| | & 4 | | | | & 5 | |
|----------+-------+--------+-------+-------+-------+--------|
| 80486SX | 2 & 3 | open | 1 & 2 | 2 & 3 | 2 & | open |
| | | | | | 3, 4 | |
| | | | | | & 5 | |
|----------+-------+--------+-------+-------+-------+--------|
| 80487SX | 1 & | 2 & 3 | 2 & 3 | 2 & 3 | 2 & | open |
| | 2, 3 | | | | 3, 4 | |
| | & 4 | | | | & 5 | |
|----------+-------+--------+-------+-------+-------+--------|
| 80486DX | 1 & | 1 & 2 | 2 & 3 | 2 & 3 | 2 & | open |
| | 2, 3 | | | | 3, 4 | |
| | & 4 | | | | & 5 | |
|----------+-------+--------+-------+-------+-------+--------|
| 80486DX2 | 1 & | 1 & 2 | 2 & 3 | 2 & 3 | 2 & | open |
| | 2, 3 | | | | 3, 4 | |
| | & 4 | | | | & 5 | |
|------------------------------------------------------------|
| Note:The location of JP15 is unknown. Pins designated |
| should be in the closed position |
+------------------------------------------------------------+