ASUS COMPUTER INTERNATIONAL =========================== PVI-486SP3 Processor CX486S/AM486SX/AM486SXL/80486SX/CX486S2/AM486SX2/AM486SXL/ 80486SX2/80487SX/CX486DX/AM486DX/AM486DXL/U5S/80486DX/ AM486DX2/AM486DXL2/CX486DX2V/CX486DX2/AM486DX2V8B/AM486DXV8T/80486DX2/CX486DX4/AM486DX4/AM486DXL4/AM486DX4V8B/80486DX4/ P24D/P24CT/Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz Speed Chip Set Unidentified Max. 128MB Onboard DRAM Cache 128/256/512KB BIOS Award Dimensions 254mm x 218mm I/O 32-bit VESA local bus slot, 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), Options parallel port, PS/2 mouse interface, serial ports (2) NPU None Options +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Purpose | Location | Purpose | Location | |----------------+----------+---------------------+----------| | PS/2 mouse | CN1 | Turbo LED | J2 pins | | interface | | | 12 - 13 | |----------------+----------+---------------------+----------| | Serial port 1 | CN2 | Green PC connector | J2 pins | | | | | 14 - 15 | |----------------+----------+---------------------+----------| | Serial port 2 | CN3 | Turbo switch | J2 pins | | | | | 16 - 17 | |----------------+----------+---------------------+----------| | Parallel port | CN4 | Reset switch | J2 pins | | | | | 19 - 20 | |----------------+----------+---------------------+----------| | Floppy drive | CN5 | Green PC connector | JP2 | | interface | | | | |----------------+----------+---------------------+----------| | IDE interface | CN6 | Green PC connector | JP3 | | (primary) | | | | |----------------+----------+---------------------+----------| | IDE interface | CN7 | IDE interface LED | JP34 | | (secondary) | | | | |----------------+----------+---------------------+----------| | Power LED & | J2 pins | 32-bit PCI slots | PC1 - | | keylock | 1 - 5 | | PC3 | |----------------+----------+---------------------+----------| | Speaker | J2 pins | 32-bit VESA local | SL1 | | | 7 - 10 | bus slot | | +------------------------------------------------------------+ +------------------------------------------------------------+ | USER CONFIGURABLE SETTINGS | |------------------------------------------------------------| | Function | Jumper | Position | |--------------------------------------+--------+------------| |>> | On board I/O enabled | JP1 | pins 2 & 3 | | | | | closed | |---+----------------------------------+--------+------------| | | On board I/O disabled | JP1 | pins 1 & 2 | | | | | closed | |---+----------------------------------+--------+------------| |>> | Monitor type select | JP8 | pins 1 & 2 | | | monochrome/VGA | | closed | |---+----------------------------------+--------+------------| | | Monitor type select CGA | JP8 | pins 2 & 3 | | | | | closed | |---+----------------------------------+--------+------------| |>> | PS/2 mouse enabled | JP14 | pins 2 & 3 | | | | | closed | |---+----------------------------------+--------+------------| | | PS/2 mouse disabled | JP14 | pins 1 & 2 | | | | | closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | |------------------+--------------------+--------------------| | 1MB | (1) 256K x 36 | NONE | |------------------+--------------------+--------------------| | 2MB | (1) 256K x 36 | (1) 256K x 36 | |------------------+--------------------+--------------------| | 2MB | (1) 512K x 36 | NONE | |------------------+--------------------+--------------------| | 3MB | (1) 256K x 36 | (1) 512K x 36 | |------------------+--------------------+--------------------| | 3MB | (1) 512K x 36 | (1) 256K x 36 | |------------------+--------------------+--------------------| | 4MB | (1) 512K x 36 | (1) 512K x 36 | |------------------+--------------------+--------------------| | 4MB | (1) 1M x 36 | NONE | |------------------+--------------------+--------------------| | 5MB | (1) 256K x 36 | (1) 1M x 36 | |------------------+--------------------+--------------------| | 5MB | (1) 1M x 36 | (1) 256K x 36 | |------------------+--------------------+--------------------| | 6MB | (1) 512K x 36 | (1) 1M x 36 | |------------------+--------------------+--------------------| | 6MB | (1) 1M x 36 | (1) 512K x 36 | |------------------+--------------------+--------------------| | 8MB | (1) 1M x 36 | (1) 1M x 36 | |------------------+--------------------+--------------------| | 8MB | (1) 2M x 36 | NONE | |------------------+--------------------+--------------------| | 9MB | (1) 256K x 36 | (1) 2M x 36 | |------------------+--------------------+--------------------| | 9MB | (1) 2M x 36 | (1) 256K x 36 | |------------------+--------------------+--------------------| | 10MB | (1) 512K x 36 | (1) 2M x 36 | |------------------+--------------------+--------------------| | 10MB | (1) 2M x 36 | (1) 512K x 36 | |------------------+--------------------+--------------------| | 12MB | (1) 1M x 36 | (1) 2M x 36 | |------------------+--------------------+--------------------| | 12MB | (1) 2M x 36 | (1) 1M x 36 | |------------------+--------------------+--------------------| | 16MB | (1) 2M x 36 | (1) 2M x 36 | |------------------+--------------------+--------------------| | 16MB | (1) 4M x 36 | NONE | |------------------+--------------------+--------------------| | 17MB | (1) 256K x 36 | (1) 4M x 36 | |------------------+--------------------+--------------------| | 17MB | (1) 4M x 36 | (1) 256K x 36 | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION (CON'T) | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | |------------------+--------------------+--------------------| | 18MB | (1) 512K x 36 | (1) 4M x 36 | |------------------+--------------------+--------------------| | 18MB | (1) 4M x 36 | (1) 512K x 36 | |------------------+--------------------+--------------------| | 20MB | (1) 1M x 36 | (1) 4M x 36 | |------------------+--------------------+--------------------| | 20MB | (1) 4M x 36 | (1) 1M x 36 | |------------------+--------------------+--------------------| | 24MB | (1) 2M x 36 | (1) 4M x 36 | |------------------+--------------------+--------------------| | 24MB | (1) 4M x 36 | (1) 2M x 36 | |------------------+--------------------+--------------------| | 32MB | (1) 4M x 36 | (1) 4M x 36 | |------------------+--------------------+--------------------| | 32MB | (1) 8M x 36 | NONE | |------------------+--------------------+--------------------| | 33MB | (1) 256K x 36 | (1) 8M x 36 | |------------------+--------------------+--------------------| | 33MB | (1) 8M x 36 | (1) 256K x 36 | |------------------+--------------------+--------------------| | 34MB | (1) 512K x 36 | (1) 8M x 36 | |------------------+--------------------+--------------------| | 34MB | (1) 8M x 36 | (1) 512K x 36 | |------------------+--------------------+--------------------| | 36MB | (1) 1M x 36 | (1) 8M x 36 | |------------------+--------------------+--------------------| | 36MB | (1) 8M x 36 | (1) 1M x 36 | |------------------+--------------------+--------------------| | 40MB | (1) 2M x 36 | (1) 8M x 36 | |------------------+--------------------+--------------------| | 40MB | (1) 8M x 36 | (1) 2M x 36 | |------------------+--------------------+--------------------| | 48MB | (1) 4M x 36 | (1) 8M x 36 | |------------------+--------------------+--------------------| | 48MB | (1) 8M x 36 | (1) 4M x 36 | |------------------+--------------------+--------------------| | 64MB | (1) 16M x 36 | NONE | |------------------+--------------------+--------------------| | 64MB | (1) 8M x 36 | (1) 8M x 36 | |------------------+--------------------+--------------------| | 65MB | (1) 256K x 36 | (1) 16M x 36 | |------------------+--------------------+--------------------| | 65MB | (1) 16M x 36 | (1) 256K x 36 | |------------------+--------------------+--------------------| | 66MB | (1) 512K x 36 | (1) 16M x 36 | |------------------+--------------------+--------------------| | 66MB | (1) 16M x 36 | (1) 512K x 36 | |------------------+--------------------+--------------------| | 68MB | (1) 1M x 36 | (1) 16M x 36 | |------------------+--------------------+--------------------| | 68MB | (1) 16M x 36 | (1) 1M x 36 | |------------------+--------------------+--------------------| | 72MB | (1) 2M x 36 | (1) 16M x 36 | |------------------+--------------------+--------------------| | 72MB | (1) 16M x 36 | (1) 2M x 36 | |------------------+--------------------+--------------------| | 80MB | (1) 4M x 36 | (1) 16M x 36 | |------------------+--------------------+--------------------| | 80MB | (1) 16M x 36 | (1) 4M x 36 | |------------------+--------------------+--------------------| | 96MB | (1) 16M x 36 | (1) 8M x 36 | |------------------+--------------------+--------------------| | 96MB | (1) 8M x 36 | (1) 16M x 36 | |------------------+--------------------+--------------------| | 128MB | (1) 16M x 36 | (1) 16M x 36 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | TAG | |------------+---------------+---------------+---------------| | 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | |------------+---------------+---------------+---------------| | 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 | |------------+---------------+---------------+---------------| | 256KB | (4) 64K x 8 | NONE | (1) 32K x 8 | |------------+---------------+---------------+---------------| | 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE JUMPER CONFIGURATION | |------------------------------------------------------------| | Size | JP15 | JP16 | JP17 | |-------+-----------------+-----------------+----------------| | 128KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | | | closed | closed | closed | |-------+-----------------+-----------------+----------------| | 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | | | closed | closed | closed | |-------+-----------------+-----------------+----------------| | 256KB | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | | | closed | closed | closed | |-------+-----------------+-----------------+----------------| | 512KB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | | | closed | closed | closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE CONFIGURATION | |------------------------------------------------------------| | Type | JP18 | JP19 | JP20 | |---------------+--------------+--------------+--------------| | CX486S | 2 & 3, 5 & 6 | 2 & 3, 5 & 6 | 2 & 3 | |---------------+--------------+--------------+--------------| | AM486SX | 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | AM486SXL | 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | 80486SX | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | CX486S2 | 2 & 3, 5 & 6 | 2 & 3, 5 & 6 | 2 & 3 | |---------------+--------------+--------------+--------------| | AM486SX2 | 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | AM486SXL2 | 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | 80486SX2 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | 80487SX | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | CX486DX | 2 & 3, 5 & 6 | 2 & 3, 5 & 6 | 2 & 3 | |---------------+--------------+--------------+--------------| | AM486DX | 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | AM486DXL | 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | U5S | 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | 80486DX | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | AM486DX2 | 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | AM486DXL2 | 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | CX486DX2V | 2 & 3, 5 & 6 | 2 & 3, 5 & 6 | 2 & 3 | |---------------+--------------+--------------+--------------| | CX486DX2 | 2 & 3, 5 & 6 | 2 & 3, 5 & 6 | 2 & 3 | |---------------+--------------+--------------+--------------| | AM486DX2V8B | 1 & 2, 4 & 5 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | AM486DX2V8T | 1 & 2, 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | 80486DX2 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | CX486DX4 | 1 & 2, 4 & 5 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | AM486DX4 | 1 & 2, 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | AM486DXL4 | 1 & 2, 5 & 6 | 4 & 5 | 4 & 5 | |---------------+--------------+--------------+--------------| | AM486DX4V8B | 1 & 2, 4 & 5 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | 80486DX4 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | P24D | 4 & 5 | 1 & 2, 5 & 6 | 1 & 2, 5 & 6 | |---------------+--------------+--------------+--------------| | P24CT | 1 & 2, 4 & 5 | 1 & 2, 5 & 6 | 5 & 6 | |---------------+--------------+--------------+--------------| | Pentium | 1 & 2, 4 & 5 | 1 & 2, 5 & 6 | 5 & 6 | | Overdrive | | | | |------------------------------------------------------------| | Note: Pins designated should be in the closed position. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE CONFIGURATION (CON'T) | |------------------------------------------------------------| | Type | JP21 | JP22 | JP23 | JP24 | |---------------+--------------+-------+----------+----------| | CX486S | 2 & 3 | 2 & 3 | Open | 2 & 3 | |---------------+--------------+-------+----------+----------| | AM486SX | Open | 4 & 5 | 5 & 6 | 2 & 3 | |---------------+--------------+-------+----------+----------| | AM486SXL | Open | 4 & 5 | 5 & 6 | 2 & 3 | |---------------+--------------+-------+----------+----------| | 80486SX | 1 & 2 | Open | Open | 2 & 3 | |---------------+--------------+-------+----------+----------| | CX486S2 | 2 & 3 | 2 & 3 | Open | 2 & 3 | |---------------+--------------+-------+----------+----------| | AM486SX2 | Open | 4 & 5 | 5 & 6 | 2 & 3 | |---------------+--------------+-------+----------+----------| | AM486SXL2 | Open | 4 & 5 | 5 & 6 | 2 & 3 | |---------------+--------------+-------+----------+----------| | 80486SX2 | 1 & 2 | Open | Open | 2 & 3 | |---------------+--------------+-------+----------+----------| | 80487SX | 1 & 2 | 1 & 2 | Open | 1 & 2 | |---------------+--------------+-------+----------+----------| | CX486DX | 2 & 3 | 2 & 3 | Open | 1 & 2 | |---------------+--------------+-------+----------+----------| | AM486DX | Open | 4 & 5 | 5 & 6 | 1 & 2 | |---------------+--------------+-------+----------+----------| | AM486DXL | Open | 4 & 5 | 5 & 6 | 1 & 2 | |---------------+--------------+-------+----------+----------| | U5S | Open | 4 & 5 | 5 & 6 | 2 & 3 | |---------------+--------------+-------+----------+----------| | 80486DX | 1 & 2 | 1 & 2 | Open | 1 & 2 | |---------------+--------------+-------+----------+----------| | AM486DX2 | Open | 4 & 5 | 5 & 6 | 1 & 2 | |---------------+--------------+-------+----------+----------| | AM486DXL2 | Open | 4 & 5 | 5 & 6 | 1 & 2 | |---------------+--------------+-------+----------+----------| | CX486DX2V | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | |---------------+--------------+-------+----------+----------| | CX486DX2 | 2 & 3 | 2 & 3 | Open | 1 & 2 | |---------------+--------------+-------+----------+----------| | AM486DX2V8B | 1 & 2, 3 & | Open | 3 & 4 | 1 & 2, 4 | | | 4, 5 & 6 | | | & 5 | |---------------+--------------+-------+----------+----------| | AM486DX2V8T | Open | 4 & 5 | 2 & 3, 5 | 1 & 2, 4 | | | | | & 6 | & 5 | |---------------+--------------+-------+----------+----------| | 80486DX2 | 1 & 2 | 1 & 2 | Open | 1 & 2 | |---------------+--------------+-------+----------+----------| | CX486DX4 | 1 & 2, 3 & | Open | Open | 1 & 2 | | | 4, 5 & 6 | | | | |---------------+--------------+-------+----------+----------| | AM486DX4 | Open | 4 & 5 | 2 & 3, 5 | 1 & 2, 4 | | | | | & 6 | & 5 | |---------------+--------------+-------+----------+----------| | AM486DXL4 | Open | 4 & 5 | 2 & 3, 5 | 1 & 2, 4 | | | | | & 6 | & 5 | |---------------+--------------+-------+----------+----------| | AM486DX4V8B | 1 & 2, 3 & | Open | 3 & 4 | 1 & 2, 4 | | | 4, 5 & 6 | | | & 5 | |---------------+--------------+-------+----------+----------| | 80486DX4 | 1 & 2 | 1 & 2 | Open | 1 & 2 | |---------------+--------------+-------+----------+----------| | P24D | 1 & 2, 3 & | Open | 3 & 4 | 1 & 2, 4 | | | 4, 5 & 6 | | | & 5 | |---------------+--------------+-------+----------+----------| | P24CT | 1 & 2 | Open | 3 & 4 | 1 & 2 | |---------------+--------------+-------+----------+----------| | Pentium | 1 & 2 | Open | 3 & 4 | 1 & 2 | | Overdrive | | | | | |------------------------------------------------------------| | Note: Pins designated should be in the closed position. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU SPEED CONFIGURATION (VT8228) | |------------------------------------------------------------| | Speed | JP25 | JP26 | JP27 | JP28 | |---------+------------+------------+------------+-----------| | 25MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 2 & | | | closed | closed | closed | 3 closed | |---------+------------+------------+------------+-----------| | 33MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | |---------+------------+------------+------------+-----------| | 40MHz | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 2 & | | | closed | closed | closed | 3 closed | |---------+------------+------------+------------+-----------| | 50iMHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 2 & | | | closed | closed | closed | 3 closed | |---------+------------+------------+------------+-----------| | 50MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & | | | closed | closed | closed | 3 closed | |---------+------------+------------+------------+-----------| | 66iMHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | |---------+------------+------------+------------+-----------| | 75iMHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 2 & | | | closed | closed | closed | 3 closed | |---------+------------+------------+------------+-----------| | 100iMHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU SPEED CONFIGURATION (AV9155) | |------------------------------------------------------------| | Speed | JP25 | JP26 | JP27 | JP28 | |---------+------------+------------+------------+-----------| | 25MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | |---------+------------+------------+------------+-----------| | 33MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | |---------+------------+------------+------------+-----------| | 40MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 1 & | | | closed | closed | closed | 2 closed | |---------+------------+------------+------------+-----------| | 50iMHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | |---------+------------+------------+------------+-----------| | 50MHz | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | |---------+------------+------------+------------+-----------| | 66iMHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | |---------+------------+------------+------------+-----------| | 75iMHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | |---------+------------+------------+------------+-----------| | 100iMHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & | | | closed | closed | closed | 2 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU VOLTAGE CONFIGURATION | |------------------------------------------------------------| | Voltage | JP7 | |----------------------------+-------------------------------| | 3.45v | pins 1 & 2 closed | |----------------------------+-------------------------------| | 3.6v | pins 2 & 3 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | VESA WAIT STATE CONFIGURATION | |------------------------------------------------------------| | Wait states | JP29 | |----------------------------+-------------------------------| | 0 wait states | pins 1 & 2 closed | |----------------------------+-------------------------------| | 1 wait state | pins 2 & 3 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | BUS SPEED CONFIGURATION | |------------------------------------------------------------| | CPU speed | JP30 | |----------------------------+-------------------------------| | <= 33MHz | pins 1 & 2 closed | |----------------------------+-------------------------------| | > 33MHz | pins 2 & 3 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | BIOS CONFIGURATION | |------------------------------------------------------------| | Setting | JP32 | JP33 | |------------------+--------------------+--------------------| | EPROM | pins 2 & 3 closed | pins 2 & 3 closed | |------------------+--------------------+--------------------| | 5v | pins 1 & 2 closed | pins 2 & 3 closed | |------------------+--------------------+--------------------| | 12v | pins 1 & 2 closed | pins 1 & 2 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | DMA CONFIGURATION | |------------------------------------------------------------| | DMA | JP9 | JP10 | |------------------+--------------------+--------------------| | DMA 1 | pins 2 & 3 closed | pins 2 & 3 closed | |------------------+--------------------+--------------------| | DMA 3 | pins 1 & 2 closed | pins 1 & 2 closed | +------------------------------------------------------------+