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Data bus: </FONT>

ADAPTEC, INC.

ACB-2070A

Data bus:

8-bit, ISA

Size:

Full-length, full-height card

Hard drives supported:

Two RLL ST506 drives

Floppy drives supported:

None

CONNECTIONS

Function

Location

20-pin data cable connector -drive 0

J0

20-pin data cable connector-drive 1

J1

34-pin control cable connector-floppy drive

J2

BIOS DRIVE TYPE TABLE

Table #

Hds

Cyls

MFM Cap.

RLL Cap.

MN-Drive 0

QR-Drive 1

OP-Drive 0

ST Drive 1

0
4
615
21.41MB
32.74MB
closed
closed
1
2
612
10.65MB
16.29MB
closed
open
2
5
981
42.69MB
65.29MB
open
closed
3
4
612
21.30MB
32.58MB
open
open

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Factory configured - do not alter
AB
open

Factory configured - do not alter
CD
open

Drive 0 is a soft-sectored ST506-type drive
EF
open

 

Drive 0 is a removable cartridge Syquest SQ319R
EF
closed

Drive 1 is a soft-sectored ST506-type drive
GH
open

 

Drive 1 is a removable cartridge Syquest SQ319R
GH
closed

CN3 and CN2 normal setting
IJ
open

 

CN2 and CN3 drive swap
IJ
closed

Normal operation
KL
open

 

Self diagnostics enable
KL
closed

MISCELLANEOUS TECHNICAL NOTES

If Jumper IJ is set to "closed" then the data cable connector assignments are swapped-
CN2 becomes drive 1 and CN3 drive 0.

Other drives may be attached by use of the user-definable parameters through software.