I-BUS ===== ORCA (REV. B) Processor CX486/AM486/80486SX/SL80486/80486DX/80486DX4/P24D/P24T Processor 25/33/40/50(internal)/50/66(internal)100(internal)MHz Speed Chip Set OPTI Video Chip Cirrus Logic Set Maximum 128MB Onboard Memory Maximum 2MB Video Memory Cache 64/128/256/512KB BIOS Unidentified Dimensions Unidentified I/O Floppy drive interface, IDE interface, parallel port, Options PS/2 mouse port, serial ports (2), VGA port NPU None Options +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Purpose | Location | Purpose | Location | |-------------------+----------+------------------+----------| | IDE interface | J2 | Auxiliary | J14 | | | | keyboard | | | | | connector | | |-------------------+----------+------------------+----------| | Floppy drive | J3 | PS/2 mouse port | J21 | | interface | | | | |-------------------+----------+------------------+----------| | Parallel port | J4 | Reset switch | J22 | |-------------------+----------+------------------+----------| | Serial port 1 | J5 | Speaker | J25 | |-------------------+----------+------------------+----------| | Serial port 2 | J6 | Chassis fan | J26 | | | | power | | |-------------------+----------+------------------+----------| | IDE interface LED | J9 | VGA port | J33 | +------------------------------------------------------------+ +------------------------------------------------------------+ | USER CONFIGURABLE SETTINGS | |------------------------------------------------------------| | Function | Label | Position | |-------------------------------------+-------+--------------| | | IDE IRQ14 enabled | J1 | Closed | |---+---------------------------------+-------+--------------| | | IDE IRQ14 disabled | J1 | Open | |---+---------------------------------+-------+--------------| | | IDE read prefetch enabled | J8 | Pins 1 & 2 | | | | | closed | |---+---------------------------------+-------+--------------| | | IDE read prefetch disabled | J8 | Pins 2 & 3 | | | | | closed | |---+---------------------------------+-------+--------------| | | IDE type select primary | J11 | Pins 1 & 3 | | | | | closed | |---+---------------------------------+-------+--------------| | | IDE type select secondary | J11 | Pins 3 & 5 | | | | | closed | |---+---------------------------------+-------+--------------| | | IDE interface enabled | J11 | Pins 2 & 4 | | | | | closed | |---+---------------------------------+-------+--------------| | | IDE interface disabled | J11 | Pins 4 & 6 | | | | | closed | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | J12 | Open | | | alter | | | |---+---------------------------------+-------+--------------| | | Floppy drive select 1.44MB | J13 | Pins 1 & 2 | | | | | closed | |---+---------------------------------+-------+--------------| | | Floppy drive select 2.88MB | J13 | Pins 3 & 4, | | | | | 5 & 6 closed | |---+---------------------------------+-------+--------------| |>> | CMOS memory normal operation | J17 | Pins 2 & 3 | | | | | closed | |---+---------------------------------+-------+--------------| | | CMOS memory clear | J17 | Pins 1 & 2 | | | | | closed | |---+---------------------------------+-------+--------------| | | PS/2 mouse IRQ12 enabled | J18 | Closed | |---+---------------------------------+-------+--------------| | | PS/2 mouse IRQ12 disabled | J18 | Open | |---+---------------------------------+-------+--------------| | | Password enabled | J19 | Closed | |---+---------------------------------+-------+--------------| | | Password disabled | J19 | Open | |---+---------------------------------+-------+--------------| | | Video IRQ9 enabled | J31 | Closed | |---+---------------------------------+-------+--------------| | | Video IRQ9 disabled | J31 | Open | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | J38 | Unidentified | | | alter | | | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | |-------+-------------+------------+------------+------------| | 4MB | (1) 1M x 36 | None | None | None | |-------+-------------+------------+------------+------------| | 8MB | (1) 2M x 36 | None | None | None | |-------+-------------+------------+------------+------------| | 8MB | (1) 1M x 36 | (1) 1M x | None | None | | | | 36 | | | |-------+-------------+------------+------------+------------| | 16MB | (1) 4M x 36 | None | None | None | |-------+-------------+------------+------------+------------| | 16MB | (1) 2M x 36 | (1) 2M x | None | None | | | | 36 | | | |-------+-------------+------------+------------+------------| | 16MB | (1) 1M x 36 | (1) 1M x | (1) 1M x | (1) 1M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 24MB | (1) 2M x 36 | (1) 2M x | (1) 1M x | (1) 1M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 32MB | (1) 8M x 36 | None | None | None | |-------+-------------+------------+------------+------------| | 32MB | (1) 4M x 36 | (1) 4M x | None | None | | | | 36 | | | |-------+-------------+------------+------------+------------| | 32MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | (1) 2M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 40MB | (1) 4M x 36 | (1) 4M x | (1) 1M x | (1) 1M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 48MB | (1) 4M x 36 | (1) 4M x | (1) 2M x | (1) 2M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 64MB | (1) 8M x 36 | (1) 8M x | None | None | | | | 36 | | | |-------+-------------+------------+------------+------------| | 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 72MB | (1) 8M x 36 | (1) 8M x | (1) 1M x | (1) 1M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 80MB | (1) 8M x 36 | (1) 8M x | (1) 2M x | (1) 2M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 96MB | (1) 8M x 36 | (1) 8M x | (1) 4M x | (1) 4M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 128MB | (1) 16M x | (1) 16M x | None | None | | | 36 | 36 | | | |-------+-------------+------------+------------+------------| | 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x | | | | 36 | 36 | 36 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE CONFIGURATION | |------------------------------------------------------------| | Note: Board accepts 64KB/128KB/256KB/512KB cache. The | | location of banks 0 & 1 is unidentified. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE JUMPER CONFIGURATION | |------------------------------------------------------------| | Size | J15 | |--------------------------+---------------------------------| | 64KB | Open | |--------------------------+---------------------------------| | 128KB | Pins 5 & 6 closed | |--------------------------+---------------------------------| | 256KB | Pins 3 & 4, 5 & 6 closed | |--------------------------+---------------------------------| | 512KB | Pins 1 & 2, 3 & 4, 5 & 6 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE BANK CONFIGURATION | |------------------------------------------------------------| | Setting | J16 | |----------------------------+-------------------------------| | Single bank | Pins 1 & 2 closed | |----------------------------+-------------------------------| | Dual banks | Pins 2 & 3 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | VIDEO MEMORY CONFIGURATION | |------------------------------------------------------------| | Note: Board accepts up to 2MB of video memory. The | | location and chip sizes are unidentified. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU SPEED SELECTION | |------------------------------------------------------------| | Speed | J7 | J28 | |---------+-------------------+------------------------------| | 25MHz | Pins 1 & 3, 2 & 4 | Pins 5 & 6 closed | | | closed | | |---------+-------------------+------------------------------| | 33MHz | Pins 1 & 3, 4 & 6 | Pins 1 & 2, 5 & 6 closed | | | closed | | |---------+-------------------+------------------------------| | 40MHz | Pins 2 & 4, 3 & 5 | Pins 3 & 4, 5 & 6 closed | | | closed | | |---------+-------------------+------------------------------| | 50iMHz | Pins 1 & 3, 2 & 4 | Pins 5 & 6 closed | | | closed | | |---------+-------------------+------------------------------| | 50MHz | Pins 3 & 5, 4 & 6 | Pins 1 & 2, 3 & 4, 5 & 6 | | | closed | closed | |---------+-------------------+------------------------------| | 66iMHz | Pins 1 & 3, 4 & 6 | Pins 1 & 2, 5 & 6 closed | | | closed | | |---------+-------------------+------------------------------| | 100iMHz | Pins 1 & 3, 4 & 6 | Pins 1 & 2, 5 & 6 closed | | | closed | | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE SELECTION | |------------------------------------------------------------| | Type | J29 | J37 | |------------+--------------------+--------------------------| | Cyrix | Pins 2 & 3 closed | Pins 1 & 2, 3 & 4 closed | |------------+--------------------+--------------------------| | AMD | Pins 1 & 2 closed | Open | |------------+--------------------+--------------------------| | Intel | Pins 1 & 2 closed | Open | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE SELECTION | |------------------------------------------------------------| | Type | J36 | |----------------------------+-------------------------------| | Intel SX | Pins 2 & 3 closed | |----------------------------+-------------------------------| | Intel DX | Pins 1 & 2, 3 & 4 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE SELECTION | |------------------------------------------------------------| | Type | J24 | |----------------------------+-------------------------------| | SL80486 | Pins 1 & 2, 3 & 4 closed | |----------------------------+-------------------------------| | P24T burst | Pins 5 & 6 closed | |----------------------------+-------------------------------| | P24T WB | Pins 7 & 8 closed | |----------------------------+-------------------------------| | P24T WT | Open | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE SELECTION | |------------------------------------------------------------| | Type | J34 | |----------------------------+-------------------------------| | Cyrix | Pins 4 & 6 closed | |----------------------------+-------------------------------| | SL80486 | Pins 2 & 4 closed | |----------------------------+-------------------------------| | P24D WB | Pins 3 & 5 closed | |----------------------------+-------------------------------| | P24D WT | Pins 1 & 3 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE SELECTION | |------------------------------------------------------------| | Type | J35 | |-------------------------------+----------------------------| | All CPU types | Pins 1 & 3 closed | |-------------------------------+----------------------------| | P24T only | Pins 3 & 5 closed | |-------------------------------+----------------------------| | Bit 0 to stop clock | Pins 2 & 4 closed | |-------------------------------+----------------------------| | Bit 1 to stop clock | Pins 4 & 6 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU MULTIPLIER SELECTION | |------------------------------------------------------------| | Multiplier | J23 | |----------------------------+-------------------------------| | Cyrix CPU | Pins 3 & 4 closed | |----------------------------+-------------------------------| | 2x | Pins 3 & 5 closed | |----------------------------+-------------------------------| | 2.5x | Pins 1 & 3 closed | |----------------------------+-------------------------------| | 3x | Open | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU FREQUENCY SELECTION | |------------------------------------------------------------| | Speed | J27 | |----------------------------+-------------------------------| | 8MHz | Pins 1 & 2 closed | |----------------------------+-------------------------------| | 16MHz (DX4) | Pins 2 & 3 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | DMA CHANNEL SELECTION | |------------------------------------------------------------| | Channel | J32 | |----------------------------+-------------------------------| | 1 | Pins 3 & 4, 5 & 6 closed | |----------------------------+-------------------------------| | 3 | Pins 1 & 2, 7 & 8 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | IDE MODE SELECTION | |------------------------------------------------------------| | Speed | J10 | |----------------------------+-------------------------------| | 180ns | Pins 1 & 3, 2 & 4 closed | |----------------------------+-------------------------------| | 240ns | Pins 3 & 5, 2 & 4 closed | |----------------------------+-------------------------------| | 383ns | Pins 1 & 3, 4 & 6 closed | |----------------------------+-------------------------------| | 480ns | Pins 3 & 5, 4 & 6 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | ON BOARD VIDEO SELECTION | |------------------------------------------------------------| | Setting | J30 | J39 | |--------------------+--------------------+------------------| | Enabled | Pins 2 & 3 closed | Closed | |--------------------+--------------------+------------------| | Disabled | Pins 1 & 2 closed | Open | +------------------------------------------------------------+