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# UNIDENTIFIED
XT-12
Processor 8088/V-20
Processor Speed 12MHz
Chip Set None
Max. Onboard DRAM 1MB
Cache None
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options Floppy drive interface
NPU Options 8087
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------------+----------+--------------+----------|
| Floppy drive | FP1 | Speaker | JP4 |
| interface | | | |
|-----------------------+----------+--------------+----------|
| Turbo LED | JP1 | Turbo switch | JP5 |
|-----------------------+----------+--------------+----------|
| Keylock | JP2 | Power LED | JP6 |
|-----------------------+----------+--------------+----------|
| Reset switch | JP3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP7 | N/A |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP8 | N/A |
|---+------------------------------------+--------+----------|
| » | CPU type select Intel 8088 | JP11 | Closed |
|---+------------------------------------+--------+----------|
| | CPU type select NEC V20 | JP11 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Location |
|-------------------------+----------------------------------|
| 256KB | (2) 44256 chips in U4 and U5 |
|-------------------------+----------------------------------|
| 512KB | (4) 44256 chips in U3 through U6 |
|-------------------------+----------------------------------|
| 768KB | (6) 44256 chips in U2 through U7 |
|-------------------------+----------------------------------|
| 1MB | (8) 44256 chips in U1 through U8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS CONFIGURATION |
|------------------------------------------------------------|
| Size | JP9A | JP9B |
|--------------------+-------------------+-------------------|
| 8/16KB | Open | Open |
|--------------------+-------------------+-------------------|
| 32KB | Closed | Open |
|--------------------+-------------------+-------------------|
| 64KB | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE 0 CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10A | JP10B |
|--------------------+-------------------+-------------------|
| 360KB 5.25" | Closed | Closed |
|--------------------+-------------------+-------------------|
| 720KB 3.5 | Open | Closed |
|--------------------+-------------------+-------------------|
| 1.2MB 5.25 | Closed | Open |
|--------------------+-------------------+-------------------|
| 1.44MB 3.5" | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE 1 CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10C | JP10D |
|--------------------+-------------------+-------------------|
| 360KB 5.25" | Closed | Closed |
|--------------------+-------------------+-------------------|
| 720KB 3.5 | Open | Closed |
|--------------------+-------------------+-------------------|
| 1.2MB 5.25 | Closed | Open |
|--------------------+-------------------+-------------------|
| 1.44MB 3.5" | Open | Open |
+------------------------------------------------------------+