Sun 386i Hardware

As I revive a Sun 386i/250 Roadrunner I will document the hardware bits.

Disk:

My 386i systems have CDC Wren IV 94171-327 327MB SCSI drives with a special plastic bracket on the bottom that goes into a socket in the case.

The drive is not going to work correctly if you don't set the jumpers correctly.

The terminators on the left and right bottom of the PCB are removed.

The first disk is SCSI ID 2, Parity enabled, chassis ground to ground lug, terminator power from the drive.

Jumper Settings ============== Connects CHASSIS GND to ground lug -------+ Connects SIGNAL GND to ground lug ------+ | Drive ID Select -------+ | | Motor Start Option enable ---+ | G G Parity Check Option enable -+ | +-+-+ +1+2+ +P-M-4-2-1+|o|o| +12-G-G-5-+ |o o o o o||o|o| | O O O O |Power |o o o o o|+-+-+ +---------+ ----------------------------+---------+---------------------SERVO-PWA -+-------+----+------------------------+--------+--------+--DATA-PWA- 1-------+ |XXXXXXXXXXXXXXXXXXXXXX1 | +----+ 1--------+ Terminator +---SCSI-Cable-----------+ |X o| Terminator |Xxxx| ++---+ TERMPWR (+5v) from drive (vertical) ------+ TERMPWR from the Bus (lower horizontal) SCSI ID -------- +----------+-----------------------+ | SCSI ID | Jumpers | | | 4 | 2 | 1 | +----------+-------+-------+-------+ | 0 | OPEN | OPEN | OPEN | | 1 | OPEN | OPEN | CLOSED| | 2 | OPEN | CLOSED| OPEN | | 3 | OPEN | CLOSED| CLOSED| | 4 | CLOSED| OPEN | OPEN | | 5 | CLOSED| OPEN | CLOSED| | 6 | CLOSED| CLOSED| OPEN | | 7 | CLOSED| CLOSED| CLOSED| +----------+-------+-------+-------+