SIREX 640KB TURBO SYSTEM Processor 8088 Processor Speed 4.77/8MHz Chip Set None Max. onboard DRAM 640KB SRAM Cache None BIOS Phoenix Dimensions 330mm x 218mm I/O Options None NPU Options 8087 [Image] CONNECTIONS Purpose Location Purpose Location Keylock C1 Speaker C4 Power LED C2 Reset switch C5 Turbo LED C3 USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » CPU speed select low J1 pins 1 & 2 switchable via keyboard closed CPU speed select high J1 pins 3 & 4 switchable via keyboard closed CPU speed select normal/turbo J1 pins 5 & 6 switchable via keyboard closed » Factory configured - do not SW1/switch 1 Off alter » NPU disabled SW1/switch 2 On NPU enabled SW1/switch 2 Off » Factory configured - do not SW1/switch 3 Off alter » Factory configured - do not SW1/switch 4 Off alter Note: The board can only use the normal/turbo mode with a reprogrammed BIOS, this option may not be available on all boards. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 256KB (8) 41256 NONE NONE NONE 512KB (8) 41256 (8) 41256 NONE NONE 578KB (8) 41256 (8) 41256 (8) 4164KB NONE 640KB (8) 41256 (8) 41256 (8) 4164KB (8) 4164KB EPROM/ROM CONFIGURATION Switch 2764 (U25A) 27128 (U25B) 8K ROM 32K ROM (U25A) (U25C) SW2/1 On On On Off SW2/2 Off Off Off On SW2/3 On Off On Off SW2/4 Off On Off On SW2/5 On On Off On SW2/6 Off Off On Off SW2/7 On On Off On SW2/8 Off Off On Off SW3/1 Off On Off On SW3/2 On Off On Off SW3/3 Off Off Off On SW3/4 On On On Off DISPLAY CONFIGURATION Display Adapter SW1/5 SW1/6 SW1/7 SW1/8 None On Off N/A N/A Color/Graphics Off On On On (40x20) Color/Graphics On Off On On (80x25) Monochrome or Both Off Off On On FLOPPY DRIVE CONFIGURATION Drives Installed SW1/7 SW1/8 1 On On 2 Off On 3 On Off 4 Off Off