UNIDENTIFIED TURBO MAINBOARD (4.77/10MHZ) Processor 8088 Processor Speed 4.77/10MHz Chip Set Unidentified Video Chip Set None Maximum Onboard Memory 640KB Maximum Video Memory None Cache None BIOS Unidentified Dimensions 276mm x 196mm I/O Options None NPU Options 8087 [Image] CONNECTIONS Purpose Location Purpose Location Speaker JP1 Turbo LED JP5 pins 1 & 2 Keylock JP3 Power LED JP5 pins 3 & 4 Reset switch JP4 Turbo switch JP6 USER CONFIGURABLE SETTINGS Function Label Position » Factory configured - do not alter SW1/1 Off » NPU not installed SW1/2 On NPU installed SW1/2 Off » Factory configured - do not alter SW1/3 Off » Factory configured - do not alter SW1/4 Off DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 2A Bank 3 Bank 3A 256KB (9) None None None None None 41256 512KB (9) (9) None None None None 41256 41256 576KB (9) (9) (2) (1) None None 41256 41256 4464 4164 640KB (9) (9) (2) (1) (2) (1) 4164 41256 41256 4464 4164 4464 FLOPPY DRIVE SELECTION Drives installed SW1/7 SW1/8 1 On On 2 Off On 3 On Off 4 Off Off MONITOR SELECTION Type SW1/5 SW1/6 None On On Color (40 x 20) Off On Color (80 x 25) On Off Monochrome Off Off TURBO SELECTION Type JP7 JP8 Always in turbo mode Pins 1 & 2 closed Pins 2 & 3 closed Turbo select through Pins 2 & 3 closed Pins 1 & 2 closed software Turbo select through Pins 1 & 2 closed Pins 1 & 2 closed software & keyboard Note: To toggle between normal and turbo modes, press CTRL, ALT, + to enable turbo and CTRL, ALT, - to disable turbo.