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# WESTERN DIGITAL CORPORATION
WD1002-27X
Replaced by the WD1004-27X
Data bus: 8-bit, PC/XT
Size: Half-length, full-height card
Hard drives supported: Two RLL ST506/412 drives
Floppy drives supported: None
Maximum heads/cyl.: 16 heads and 1024 cylinders
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|----------------------------------------------+-------------|
| 34-pin control cable connector-hard drive | J1 |
|----------------------------------------------+-------------|
| 20-pin data cable connector-drive 0 | J2 |
|----------------------------------------------+-------------|
| 20-pin data cable connector-drive 1 | J3 |
|----------------------------------------------+-------------|
| 5-pin DC power connector | J4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRIVE TYPE CONFIGURATION |
|------------------------------------------------------------|
| | DRIVE 1 | DRIVE 0 | |
|--------+------------+------------+-------------------------|
| Type # | S1/jumper | S1/jumper | S1/jumper | S1/jumper |
| | 1 | 2 | 3 | 4 |
|--------+------------+------------+------------+------------|
| 0 | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 1 | open | closed | open | closed |
|--------+------------+------------+------------+------------|
| 2 | closed | open | closed | open |
|--------+------------+------------+------------+------------|
| 3 | open | open | open | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|---------------------------------+-------------+------------|
| » | BIOS enabled | W3 | closed |
|---+-----------------------------+-------------+------------|
| | BIOS disabled | W3 | open |
|---+-----------------------------+-------------+------------|
| » | I/O port address is | W4 | pins 1 & 2 |
| | 324-327h | | closed |
|---+-----------------------------+-------------+------------|
| | I/O port address is | W4 | pins 2 & 3 |
| | 320-323h | | closed |
|---+-----------------------------+-------------+------------|
| » | 2732 & 2764 BIOS supported | W5 | pins 1 & 2 |
| | (hard-wired) | | closed |
|---+-----------------------------+-------------+------------|
| | 2716 BIOS supported | W5 | pins 2 & 3 |
| | | | closed |
|---+-----------------------------+-------------+------------|
| » | 8 head hard drive with RWC | W6 | pins 2 & 3 |
| | supported | | closed |
|---+-----------------------------+-------------+------------|
| | 16 head hard drive | W6 | pins 1 & 2 |
| | supported | | closed |
|---+-----------------------------+-------------+------------|
| » | Hard Drive Interrupt is | W7 | pins 1 & 2 |
| | IRQ5 (hard-wired) | | closed |
|---+-----------------------------+-------------+------------|
| | Hard Drive Interrupt is | W7 | pins 2 & 3 |
| | IRQ2 | | closed |
|---+-----------------------------+-------------+------------|
| » | Single controller setting, | W8 | pins 2 & 3 |
| | primary controller | | closed |
|---+-----------------------------+-------------+------------|
| | Dual controller setting, | W8 | pins 1 & 2 |
| | secondary controller | | closed |
|---+-----------------------------+-------------+------------|
| » | Firmware translation | W9 | closed |
| | enabled | | |
|---+-----------------------------+-------------+------------|
| | Firmware translation | W9 | open |
| | disabled | | |
|---+-----------------------------+-------------+------------|
| » | Hard Drive Interrupt is | S1/jumper 7 | open |
| | IRQ5 | | |
|---+-----------------------------+-------------+------------|
| | Hard Drive Interrupt is | S1/jumper 7 | closed |
| | IRQ2 | | |
|---+-----------------------------+-------------+------------|
| » | AT mode enabled | S1/jumper 8 | closed |
|---+-----------------------------+-------------+------------|
| | XT mode enabled | S1/jumper 8 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS DRIVE TYPE TABLE |
|------------------------------------------------------------|
| Type # | Formatted | Heads | Physical/Logical |
| | Capacity | | Cylinders |
|--------+----------------+-------+--------------------------|
| 0 | 65MB | 5 | 981/1023 |
|--------+----------------+-------+--------------------------|
| 1 | 92MB | 7 | 987/1023 |
|--------+----------------+-------+--------------------------|
| 2 | 33MB | 4 | 612/935 |
|--------+----------------+-------+--------------------------|
| 3 | 33MB | 4 | 615/940 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSLATION CONFIGURATION - S1 & W9 |
|------------------------------------------------------------|
|SPT| BIOS | Dynamic | RLL | S1 | S1 | W9 |
| | | | BIOS | | | |
| |Translate|Configuration| |Jumper 5|Jumper 6| see |
| | | | Type | | | above |
|---+---------+-------------+------+--------+--------+-------|
| - |Undefined| - | - | open | open | - |
|---+---------+-------------+------+--------+--------+-------|
|17 | yes | no | 1 | closed | open | open |
|---+---------+-------------+------+--------+--------+-------|
|26 | no | yes | 2 | open | closed | open |
|---+---------+-------------+------+--------+--------+-------|
|17 | no | yes | 0 | closed | closed |closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| This controller has a built-in low-level format program. |
| To enter the program run the DEBUG utility supplied with |
| DOS and at the prompt enter: G=C800:5. |
+------------------------------------------------------------+