UNIDENTIFIED A351 386SX Processor 80386SX Processor Speed 16/20MHz Chip Set UMC Max. onboard DRAM 4MB Cache None BIOS AMI Dimensions 330mm x 220mm I/O Options Floppy drive interface, game port, IDE interface, parallel port, serial ports (2), VGA feature connector NPU Options 80387SX [Image] CONNECTIONS Purpose Location Purpose Location External battery J1 Floppy drive interface P2 Speaker J2 IDE interface P3 Power LED & keylock J3 VGA feature connector P4 Turbo switch J4 Serial port 2 Unknown Reset switch J5 Serial port 1 Unknown IDE interface LED J6 Parallel port Unknown Turbo LED J7 Game port Unknown Note:J4 might not be available on future boards. USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Onboard VGA enabled JP2 pins 1 & 2 closed Onboard VGA disabled JP2 pins 2 & 3 closed » Monitor type select CGA JP3 Closed Monitor type select JP3 Open monochrome » Factory configured - do not JP4 Open alter » Battery select internal JP5 Closed Battery select 6V external JP5 Open » Monitor type select color SW1/3 Off Monitor type select SW1/3 On monochrome » Floppy drive interface (P2) SW1/4 Off enabled Floppy drive interface (P2) SW1/4 On disabled » Parallel port select LPT1 SW1/5 Off (378-37Fh) Parallel port select LPT2 SW1/5 On (278-27Fh) » IDE interface (P3) enabled SW1/6 Off IDE interface (P3) disabled SW1/6 On » Game port enabled SW1/7 Off Game port disabled SW1/7 On » NPU synchronous with CPU SW1/8 Off NPU asynchronous with CPU SW1/8 On » CMOS memory normal operation P1 Open CMOS memory clear P1 Closed Note: If an EGA or VGA monitor is installed, JP3 can be on either setting. DRAM CONFIGURATION Size Bank 0 Bank 1 512KB (2) 256K x 9 None 1MB (2) 256K x 9 (2) 256K x 9 2MB (2) 1M x 9 None 4MB (2) 1M x 9 (2) 1M x 9 MONITOR TYPE CONFIGURATION MonitorType SW2/1 SW2/2 SW2/3 SW2/4 SW2/5 CGA On On On On On MDA Off On On On On Pure MDA (no On Off On On On emulation) EGA Off Off On On On Pure EGA (no On On Off On On emulation) VGA Color Off On Off On On VGA Mono On Off Off On On 8514 Off Off Off On On NEC 2A (640 x 480) On On On Off On NEC/NEC+ Off On On Off On (multifrequency) NEC XL (1024 x 768) On Off On Off On NEC 3D (1024 x 768) Off Off On Off On NEC4D/NEC5D (1024 x On On Off Off On 768) Portrait Off On Off Off On Note:SW2/5 on = interlaced display. For non-interlaced display this setting should be in the Off position. SERIAL PORT CONFIGURATION Serial port 1 Serial port 2 SW1/switch 2 SW1/switch 2 COM1 COM2 Off Off COM1 Disabled Off Off Disabled COM2 On On Disabled Disabled On On