AT & T, INC. 6300 XT Processor 8086 Processor Speed 4.77MHz Chip Set None Max. Onboard DRAM 640KB Cache None BIOS AT&T Dimensions 272mm x 254mm I/O Options Parallel port, serial ports (2), floppy drive interface NPU Options 8087 [Image] SYSTEM BOARD CONNECTIONS Purpose Location Purpose Location To CRT controller J1 Serial port 2 J5 board at J9 To CRT controller J2 Keyboard J6 board at J11 Serial port 1 J3 Floppy drive J7 Parallel port J4 +/- 12V Power P1 Note:Bus converter board and display enhancement board not shown. SYSTEM BOARD USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Factory configured - do not JA N/A alter » Factory configured - do not JB N/A alter » Clock enabled JC Closed Clock disabled JC Open » Factory configured - do not JD N/A alter » Clock battery enabled JE Closed Clock battery disabled JE Open » NPU enabled SW0/5 Off NPU disabled SW0/5 On » Serial interface select 8250 SW0/6 On Serial interface select 8350 SW0/6 Off » BIOS type select 2732 SW0/8 On BIOS type select 2764 SW0/8 Off » Disk drive select 96 TPI SW1/1 Off Disk drive select 48 TPI SW1/1 On » Disk drive select fast SW1/2 Off start-up Disk drive select slow SW1/2 On start-up DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 128KB (9) 4164 (9) 4164 NONE NONE 256KB (9) 4164 (9) 4164 (9) 4164 (9) 4164 512KB (9) 4464 (9) 4464 NONE NONE 640KB (9) 4164 (9) 4164 (9) 41256 (9) 41256 DRAM SWITCH CONFIGURATION Size SW0/1 SW0/2 SW0/3 SW0/4 128KB Off On On On 256KB On Off On On 512KB On On Off On 640KB Off On Off On VIDEO CONFIGURATION Size SW1/5 SW1/6 80 columns On Off 40 columns Off On HARD DRIVE CONFIGURATION Setting SW1/3 SW1/4 Enabled Off Off Disabled On On FLOPPY DRIVE CONFIGURATION Drives installed SW1/7 SW1/8 1 On On 2 Off On [Image] CRT CONTROLLER BOARD CONNECTIONS Purpose Location Purpose Location To bus converter J8 Monitor J12 board To system board at J9 To display J13 J1 enhancement board To bus converter J10 +15V Power P2 board To system board at J11 J2 CRT CONTROLLER BOARD USER CONFIGURABLE SETTINGS Function Jumper Position » Oscillator select internal JF pins 2 & 3 closed Oscillator select on display JF pins 4 & 5 enhancement board closed » Clock select internal JF pins 5 & 6 closed Oscillator select 24MHz JF pins 1 & 2 closed