DISTRIBUTED PROCESSING TECHNOLOGY
PM2021A/90, PM2021A/95
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|
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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) |
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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 |
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LED 7 |
Disk Write |
|
LED 8 |
Adapter Reset |
|
LED 9 |
Interrupt Pending to Computer |
|
LED 10 |
DRQ Asserted to Computer |
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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. |