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 |
SYSTEM BOARD CONNECTIONS | |||
Purpose | Location | Purpose | Location |
To CRT controller board at J9 | J1 | Serial port 2 | J5 |
To CRT controller board at J11 | J2 | Keyboard | J6 |
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 alter | JA | N/A |
» | Factory configured - do not alter | JB | N/A |
» | Clock enabled | JC | Closed |
Clock disabled | JC | Open | |
» | Factory configured - do not alter | JD | N/A |
» | 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 start-up | SW1/2 | Off |
Disk drive select slow start-up | SW1/2 | On |
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 |
CRT CONTROLLER BOARD CONNECTIONS | |||
Purpose | Location | Purpose | Location |
To bus converter board | J8 | Monitor | J12 |
To system board at J1 | J9 | To display enhancement board | J13 |
To bus converter board | J10 | +15V Power | P2 |
To system board at J2 | J11 |
CRT CONTROLLER BOARD USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Oscillator select internal | JF | pins 2 & 3 closed |
Oscillator select on display enhancement board | JF | pins 4 & 5 closed | |
» | Clock select internal | JF | pins 5 & 6 closed |
Oscillator select 24MHz | JF | pins 1 & 2 closed |