UNIDENTIFIED TURBO MAIN BOARD Processor 8088 Processor Speed 8MHz Chip Set Unidentified Max. Onboard DRAM 640KB Cache None BIOS Unidentified Dimensions 330mm x 218mm I/O Options None NPU Options 8087 [Image] CONNECTIONS Purpose Location Purpose Location Reset switch JP1 Turbo LED P6 pins 1 & 2 Turbo LED P3 Reset switch P6 pins Speaker P4 Keylock P6 pins Turbo switch P5 Turbo LED P7 USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Turbo enabled P5 pins 1 & 2 closed Turbo disabled P5 pins 3 & 4 closed » Turbo enabled SW2/1 Off Turbo disabled SW2/1 On » NPU disabled SW2/2 On NPU enabled SW2/2 Off DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 64KB (9) 4164 NONE NONE NONE 128KB (9) 4164 (9) 4164 NONE NONE 192KB (9) 4164 (9) 4164 (9) 4164 NONE 256KB (9) 4164 (9) 4164 (9) 4164 (9) 4164 256KB (9) 41256 NONE NONE NONE 640KB (9) 41256 (9) 41256 (9) 4164 (9) 4164 DRAM SWITCH CONFIGURATION Size SW2/3 SW2/4 64KB On On 128KB Off On 192KB Off On 256KB Off Off 640KB Off Off DRAM SWITCH CONFIGURATION Size JP2 Bank 0 & 1 = 41256 Closed Bank 2 & 3 = 4164 Closed DRAM SWITCH CONFIGURATION Size JP2 Bank 0 & 1 = 4164 Open Bank 2 & 3 = 4164 Open MONITOR CONFIGURATION Type SW2/5 SW2/6 Monochrome Off Off 40 x 25 color Off On 80 x 25 color On Off FLOPPY DRIVE CONFIGURATION Type SW2/7 SW2/8 1 On On 2 Off On 3 On Off 4 Off Off