(TXT) View Source
# DD & TT ENTERPRISE USA COMPANY
DT ESCORT SYSTEM BOARD B
Processor 80486SX/80486DX/ODP486SX/80486DX2
Processor Speed 16/20/25/33/50(internal)/50/66(internal)MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64KB/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interface
parallel port,
Proprietary EISA riser card slot, PS/2 mouse
port,
Serial port (2), VGA port, video feature
connector
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| PS/2 mouse port | J2 | Reset switch | J12A |
|------------------+----------+-------------------+----------|
| Serial port (COM | J3 | Turbo switch | J12B |
| 1) | | | |
|------------------+----------+-------------------+----------|
| Serial port (COM | J4 | Turbo LED | J12C |
| 2) | | | |
|------------------+----------+-------------------+----------|
| Parallel port | J5 | IDE interface LED | J12D |
|------------------+----------+-------------------+----------|
| VGA port | J6 | Not used | J12E |
|------------------+----------+-------------------+----------|
| Floppy drive | J9 | Speaker | J13A |
| interface | | | |
|------------------+----------+-------------------+----------|
| Video feature | J10 | Power LED & | J13B |
| connector | | keylock | |
|------------------+----------+-------------------+----------|
| IDE interface | J11 | Proprietary EISA | S1 |
| | | riser card slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|----------------------------+---------------+---------------|
| » | Floppy drive disabled | E1 | Pins 1 & 3 |
| | | | closed |
|---+------------------------+---------------+---------------|
| | Floppy drive enabled | E1 | Pins 3 & 5 |
| | | | closed |
|---+------------------------+---------------+---------------|
| | Floppy drive address | E1 | Pins 7 & 9 |
| | select 3FO-3F7 | | closed |
|---+------------------------+---------------+---------------|
| | Floppy drive address | E1 | Pins 9 & 11 |
| | select 370-377 | | closed |
|---+------------------------+---------------+---------------|
| » | IDE interface disabled | E1 | Pins 2 & 4 |
| | | | closed |
|---+------------------------+---------------+---------------|
| | IDE interface enabled | E1 | Pins 4 & 6 |
| | | | closed |
|---+------------------------+---------------+---------------|
| | IDE interface address | E1 | Pins 8 & 10 |
| | select 3FO-3F7, | | closed |
| | 1FO-1F7 | | |
|---+------------------------+---------------+---------------|
| | IDE interface address | E1 | Pins 10 & 12 |
| | select 370-377, | | closed |
| | 170-177 | | |
|---+------------------------+---------------+---------------|
| » | Onboard video enabled | E2 | Pins 1 & 2, 3 |
| | | | & 4, 5 & 6 |
| | | | closed |
|---+------------------------+---------------+---------------|
| | Onboard video disabled | E2 | Pins 1 & 2, 3 |
| | | | & 4, 5 & 6 |
| | | | open |
|---+------------------------+---------------+---------------|
| » | BIOS device select 1MB | E6 | Pins 1 & 2 |
| | | | closed |
|---+------------------------+---------------+---------------|
| | BIOS device select 2MB | E6 | Pins 3 & 5 |
| | | | closed |
|---+------------------------+---------------+---------------|
| | BIOS device select | E6 | Pins 2 & 4, 7 |
| | read only | | & 9, 8 & 10 |
| | | | closed |
|---+------------------------+---------------+---------------|
| | BIOS device select | E6 | Pins 4 & 6, 9 |
| | read/write | | & 11, 10 & 12 |
|---+------------------------+---------------+---------------|
| » | Chipset mode select 2x | E7 | Pins 3 & 5 |
| | for 40MHz or less | | closed |
|---+------------------------+---------------+---------------|
| | Chipset mode select 1x | E7 | Pins 1 & 3 |
| | for true 50MHz only | | closed |
|---+------------------------+---------------+---------------|
| | Chipset mode RDY1 set | E7 | Pins 4 & 6 |
| | for 1X mode | | closed |
|---+------------------------+---------------+---------------|
| | Chipset mode RDY2 set | E7 | Pins 2 & 4 |
| | for 2X mode | | closed |
|---+------------------------+---------------+---------------|
| » | Chipset mode burst | E8 | Pins 23 & 24 |
| | rate select 3-2-2-2 | | closed |
|---+------------------------+---------------+---------------|
| | Chipset mode burst | E8 | Pins 23 & 24 |
| | rate select 2-1-1-1 | | open |
|---+------------------------+---------------+---------------|
| » | Chipset mode write | E8 | Pins 25 & 26 |
| | states select 0 wait | | closed |
| | state | | |
|---+------------------------+---------------+---------------|
| | Chipset mode write | E8 | Pins 25 & 26 |
| | states select 1 wait | | open |
| | state | | |
|---+------------------------+---------------+---------------|
| » | Factory configured - | E9 | Pins 39 & 40 |
| | do not alter | | closed |
|---+------------------------+---------------+---------------|
| » | PS/2 mouse enable at | E10 | Closed |
| | IRQ12 | | |
|---+------------------------+---------------+---------------|
| | PS/2 mouse disable | E10 | Open |
|---+------------------------+---------------+---------------|
| » | Factory configured do | E11 | Unknown |
| | not alter | | |
|---+------------------------+---------------+---------------|
| » | CPU clock select mode | E12 | Pins 2 & 3 |
| | 2X | | closed |
|---+------------------------+---------------+---------------|
| | CPU clock select mode | E12 | Pins 1 & 2 |
| | 1 x for 486DX 50MHz | | closed |
|---+------------------------+---------------+---------------|
| » | Factory configured - | E15 | Pins 1 & 2 |
| | do not alter | | closed |
|------------------------------------------------------------|
| Note: If there is no monochrome Hercules card present then |
| the system will automatically assume that address 378h |
| is LPT1 and address 278h is LPT2 pins designated should be |
| in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 4M x 9 | None |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Bank 0 & 1 | (1) 8K x 4 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Bank 0 & 1 | (1) 32K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| E9 | 64KB | 256KB |
|------------------+--------------------+--------------------|
| Pins 1, 3, 5 | Pins 1 & 3 closed | Pins 3 & 5 closed |
|------------------+--------------------+--------------------|
| Pins 2, 4, 6 | Pins 2 & 4 closed | Pins 2 & 4 closed |
|------------------+--------------------+--------------------|
| Pins 7, 9, 11 | Pins 7 & 9 closed | Pins 9 & 11 closed |
|------------------+--------------------+--------------------|
| Pins 8, 10, 12 | Open | Pins 8 & 10 closed |
|------------------+--------------------+--------------------|
| Pins 13, 15, 17 | Pins 15 & 17 | Pins 15 & 17 |
| | closed | closed |
|------------------+--------------------+--------------------|
| Pins 14, 16, 18 | Pins 14 & 16 | Pins 14 & 16 |
| | closed | closed |
|------------------+--------------------+--------------------|
| Pins 19, 21, 23 | Pins 21 & 23 | Pins 21 & 23 |
| | closed | closed |
|------------------+--------------------+--------------------|
| Pins 20, 22, 24 | Open | Pins 20 & 22 |
| | | closed |
|------------------+--------------------+--------------------|
| Pins 26, 28, 30 | Pins 26 & 28 | Pins 26 & 28 |
| | closed | closed |
|------------------+--------------------+--------------------|
| Pins 31, 33, 35 | Pins 33 & 35 | Pins 33 & 35 |
| | closed | closed |
|------------------+--------------------+--------------------|
| Pins 32, 34, 36 | Pins 34 & 36 | Pins 34 & 36 |
| | closed | closed |
|------------------+--------------------+--------------------|
| Pins 37 & 38 | Open | Closed |
|------------------------------------------------------------|
| Note: For non-cache configuration pins 25, 26, & 27 should |
| be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NON CACHE CONFIGURATION E16 |
|------------------------------------------------------------|
| Pins | Pins | Pins | 8 & 10, | Pins 13 | 15 & 16, 17 |
| 1-3-5 | 2-4-6 | 7-9-11 | 11 & 12 | & 14 | & 18 |
|--------+--------+--------+---------+---------+-------------|
| 3 & 5 | 2 & 4 | 7 & 9 | Closed | Closed | Open |
| closed | closed | closed | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Jumper | 80486DX/80486DX2 | 80386SX/80486SLC |
|-----------------+---------------------+--------------------|
| E8/pins 1, 3, 5 | Pins 1 & 3 closed | Pins 3 & 5 closed |
|-----------------+---------------------+--------------------|
| E8/pins 2, 4, 6 | Pins 2 & 4 closed | Pins 4 & 6 closed |
|-----------------+---------------------+--------------------|
| E8/pins 7, 9, | Pins 7 & 9 closed | Pins 9 & 11 closed |
| 11 | | |
|-----------------+---------------------+--------------------|
| E8/pins 8, 10, | Pins 8 & 10 closed | Pins 10 & 12 |
| 12 | | closed |
|-----------------+---------------------+--------------------|
| E8/pins 13 & 14 | Closed | Open |
|-----------------+---------------------+--------------------|
| E8/pins 15 & 16 | Open | Closed |
|-----------------+---------------------+--------------------|
| E8/pins 17 & 18 | Closed | Open |
|-----------------+---------------------+--------------------|
| E8/pins 19 & 20 | Closed | Open |
|-----------------+---------------------+--------------------|
| E8/pins 21 & 22 | Open | Closed |
|-----------------+---------------------+--------------------|
| E13/pins 1 & 2, | Pins 1 & 2, 3 & 4, | Pins 2 & 3 closed |
| 3 & 4, 5 & 6 | 5 & 6 closed | |
|------------------------------------------------------------|
| Note: settings for the 80386SX and 80486SLC are factory |
| configured and should not be altered. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
|Speed| U51 | U52 |Pins 1 & |Pins 3 &|Pins 5 &|Pins 7|
| | | | 2 | 4 | 6 | & 8 |
|-----+---------+---------+---------+--------+--------+------|
|16MHz|Installed| Empty | Closed | Open | Closed | N/A |
|-----+---------+---------+---------+--------+--------+------|
|16MHz| Empty |Installed| Closed | Open | Closed |Closed|
|-----+---------+---------+---------+--------+--------+------|
|20MHz|Installed| Empty | Closed | Open | Open | N/A |
|-----+---------+---------+---------+--------+--------+------|
|20MHz| Empty |Installed| Open | Open | Closed |Closed|
|-----+---------+---------+---------+--------+--------+------|
|25MHz|Installed| Empty | Open | Closed | Closed | N/A |
|-----+---------+---------+---------+--------+--------+------|
|25MHz| Empty |Installed| Closed | Closed | Open |Closed|
|-----+---------+---------+---------+--------+--------+------|
|33MHz|Installed| Empty | Open | Closed | Open | N/A |
|-----+---------+---------+---------+--------+--------+------|
|33MHz| Empty |Installed| Open | Closed | Open |Closed|
|-----+---------+---------+---------+--------+--------+------|
|40MHz|Installed| Empty | Open | Open | Closed | N/A |
|-----+---------+---------+---------+--------+--------+------|
|40MHz| Empty |Installed| Closed | Open | Open |Closed|
|-----+---------+---------+---------+--------+--------+------|
|50MHz|Installed| Empty | Open | Closed | Closed | N/A |
|-----+---------+---------+---------+--------+--------+------|
|50MHz| Empty |Installed| Closed | Closed | Open |Closed|
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT A (J3) CONFIGURATION |
|------------------------------------------------------------|
| COM | I/O Address | E4 | E5 |
|--------------+-------------+---------------+---------------|
| » | COM1 | 3F8h | Pins 3 & 5, 2 | Pins 3 & 5, 2 |
| | | | & 4, 7 & 8 | & 4, 7 & 8 |
|---+----------+-------------+---------------+---------------|
| | COM3 | 3E8h | Pins 1 & 3, 4 | Pins 1 & 3, 4 |
| | | | & 6, 7 & 8 | & 6, 7 & 8 |
|---+----------+-------------+---------------+---------------|
| | COM4 | 2E8h | Pins 3 & 5, 4 | Pins 3 & 5, 4 |
| | | | & 6, 7 & 8 | & 6 |
|---+----------+-------------+---------------+---------------|
| | Disabled | N/A | Pins 1 & 3, 2 | Pins 1 & 3, 2 |
| | | | & 4 | & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT B (J4) CONFIGURATION |
|------------------------------------------------------------|
| COM | I/O Address | E4 | E5 |
|--------------+-------------+---------------+---------------|
| » | COM2 | 2F8h | Pins 3 & 5, 2 | Pins 3 & 5, 2 |
| | | | & 4, 7 & 8 | & 4, 7 & 8 |
|---+----------+-------------+---------------+---------------|
| | COM3 | 3E8h | Pins 1 & 3, 4 | Pins 1 & 3, 4 |
| | | | & 6, 7 & 8 | & 6, 7 & 8 |
|---+----------+-------------+---------------+---------------|
| | COM4 | 2E8h | Pins 3 & 5, 4 | Pins 3 & 5, 4 |
| | | | & 6, 7 & 8 | & 6 |
|---+----------+-------------+---------------+---------------|
| | Disabled | N/A | Pins 1 & 3, 2 | Pins 1 & 3, 2 |
| | | | & 4 | & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT (J5) CONFIGURATION |
|------------------------------------------------------------|
| COM | IRQ | I/O Address | E3 |
|--------------+------+-------------+------------------------|
| » | LPT1 | IRQ7 | 3BCh | Pins 3 & 5, 4 & 6, 7 & |
| | | | | 8 |
|---+----------+------+-------------+------------------------|
| | LPT1 | IRQ5 | 3BCh | Pins 3 & 5, 4 & 6, 9 & |
| | | | | 10 |
|---+----------+------+-------------+------------------------|
| | LPT2 | IRQ7 | 378h | Pins 3 & 5, 2 & 6, 7 & |
| | | | | 8 |
|---+----------+------+-------------+------------------------|
| | LPT2 | IRQ5 | 378h | Pins 3 & 5, 2 & 6, 9 & |
| | | | | 10 |
|---+----------+------+-------------+------------------------|
| | LPT3 | IRQ7 | 278h | Pins 1 & 3, 4 & 6, 7 & |
| | | | | 8 |
|---+----------+------+-------------+------------------------|
| | LPT3 | IRQ5 | 278h | Pins 1 & 3, 4 & 6, 9 & |
| | | | | 10 |
|---+----------+------+-------------+------------------------|
| | Disabled | N/A | N/A | Pins 1 & 3, 2 & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 512KB | (4) 44256 | NONE |
|------------------+--------------------+--------------------|
| 1024KB | (4) 44256 | (4) 44256 |
|------------------------------------------------------------|
| Note: Bank 0 is permanently soldered onto the board. |
+------------------------------------------------------------+