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# 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
IMG IMG 1
+------------------------------------------------------------+
| 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 | SW0/6 | On |
| | 8250 | | |
|---+-----------------------------+---------------+----------|
| | Serial interface select | SW0/6 | Off |
| | 8350 | | |
|---+-----------------------------+---------------+----------|
| » | 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 |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| CRT CONTROLLER BOARD CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| To bus converter | J8 | Monitor | J12 |
| board | | | |
|------------------+----------+-------------------+----------|
| To system board | J9 | To display | J13 |
| at J1 | | enhancement board | |
|------------------+----------+-------------------+----------|
| To bus converter | J10 | +15V Power | P2 |
| board | | | |
|------------------+----------+-------------------+----------|
| To system board | J11 | | |
| at 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 |
+------------------------------------------------------------+