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PM2021A/90, PM2021A/95

DISTRIBUTED PROCESSING TECHNOLOGY

PM2021A/90, PM2021A/95

Data bus:

16-bit, ISA (PM2021A/9x)

Size:

Half-length, full-height card

Hard drive supported:

Up to seven SCSI drives

Floppy drives supported:

Two 360KB, 720KB, 1.2MB, or 1.44MB drives (PM2x2x/95 only)

CONNECTIONS

Function

Location

CM4000 Cache Module Connector

P1

CM4000 Cache Module Connector

P2

DM4000 Disk Array Module Connector

P5

4-pin connector-Drive active LED

P6

DM400 Disk Array Module Connector

P7

34-pin control cable connector-floppy drive

P8

50-pin SCSI connector - internal

P10

50-pin SCSI connector - external

J11

DMA TRANSFER RATE

Speed

Jumper Y12

Jumper Y13

Jumper Y14

 

10MB/sec

open

open

open

 

8MB/sec

closed

open

open

 

6.667MB/sec

open

closed

open

 

5.7MB/sec

closed

closed

open

5.0MB/sec

open

open

closed

 

4.4MB/sec

closed

open

closed

 

4.0MB/sec

open

closed

closed

 

3.0MB/sec

closed

closed

closed

SCSI ADDRESS

SCSI I.D.

Jumper Y18

Jumper Y25

Jumper Y26

 

0

open

open

open

 

1

open

closed

open

 

2

closed

open

open

 

3

closed

closed

open

 

4

open

open

closed

 

5

open

closed

closed

 

6

closed

open

closed

7

closed

closed

closed

INTERRUPT REQUEST

IRQ

Y29

Y30

 

Disabled

open

open

 

IRQ12

open

closed

IRQ15

closed

open

 

IRQ14

closed

closed

DMA CHANNEL

DRQ

Y31

Y32

 

DRQ0

open

open

 

DRQ7

open

closed

 

DRQ6

closed

open

DRQ5

closed

closed

I/O PORT ADDRESS

Address

Y33

Y35

 

230h

open

open

170h

open

closed

 

330h

closed

open

 

1F0h

closed

closed

BIOS ADDRESS

Address

Y36

Y37

 

Disabled

open

open

 

DC00h

open

closed

 

D800h

closed

open

C800h

closed

closed

USER CONFIGURABLE SETTINGS

Function

Location

Setting

DMA duty cycle is fast

Y15

open

 

DMA duty cycle is slow

Y15

closed

SCSI termination enabled

Y16

closed

 

SCSI termination disabled

Y16

open

Address LInes SA17-19 and LA17-19 driven

Y19

closed

 

Only Address LInes LA17-19 driven

Y19

open

Floppy drive enabled

Y20

closed

 

Floppy drive disabled

Y20

open

Bus Mastering enabled

Y24

closed

 

Bus Mastering disabled

Y24

open

BIOS ROM size is 8K

Y38

open

 

BIOS ROM size is 16K

Y38

closed

External SCSI cable detection disabled

Y39

open

 

External SCSI cable detection enabled*

Y39

closed

Controller supplies TERMPWR to SCSI interface 26

Y50

closed

 

TERMPWR not supplied to SCSI Interface 26

Y50

open

STATUS LED'S

LED

Definition

LED 1

Busy

LED 2

Computer Bus Transfer to Adapter

LED 3

Computer Bus Transfer from Adapter

LED 4

Cache Hit

LED 5

Disk Read-Ahead Active

LED 6

Disk Read

LED 7

Disk Write

LED 8

Adapter Reset

LED 9

Interrupt Pending to Computer

LED 10

DRQ Asserted to Computer

MISCELLANEOUS TECHNICAL NOTES

Detection of an external SCSI cable limits the maximum SCSI bus transfer rate to 5MB/sec.

The function of Jumper Y34 is unknown.