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 +------------------------------------------------------------+ | 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. | +------------------------------------------------------------+