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CNT-AT2

CORE INTERNATIONAL, INC.

CNT-AT2

Data bus: 16 bit, ISA

Size: Full-length, full-height card

Hard drives supported: Two ESDI drives

Floppy drives supported: Two 360 KB, 720 KB, 1.2 MB or 1.44 MB drives.

Maximum heads/cyl.: 16 heads and 2048 cylinders

CONNECTIONS

Function

Location

34-pin data cable connector-floppy drive

CN1

20-pin data cable connector-drive 1

CN3

20-pin data cable connector-drive 0

CN4

34-pin control cable connector-hard drive

CN5

4-pin connector-drive active LED

CN6

MISCELLANEOUS TECHNICAL NOTES

Jumpers JP1, JP2, JP3, JP4, and JP7 are Factory configured - do not alter.

Jumper JP6, pins 2 & 3, are Not used.

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Cache enabled

JP4A

open

 

Cache disabled

JP4A

closed

32KB data buffer configuration

JP5

pins 1 & 2 closed

 

8KB data buffer configuration

JP5

pins 2 & 3 closed

8/32KB data buffer configuration

JP6

pins 1 & 2 closed

Supports a third floppy (DS2) on a twisted cable

JP11/jumper 1

open

 

Supports a third floppy (DS4) on a straight cable

JP11/jumper 1

closed

Floppy drive 1 is configured as AT type.

JP11/jumper 2

open

 

Floppy drive 1 is configured as PS/2 type.

JP11/jumper 2

closed

Floppy drive 0 is configured as AT type.

JP11/jumper 3

open

 

Floppy drive 0 is configured as PS/2 type.

JP11/jumper 3

closed

Floppy drive port address 3F0-3F7h

JP11/jumper 4

open

 

Floppy drive port address 370-377h

JP11/jumper 4

closed

Single-speed floppy supported

JP11/jumper 5

open

 

Dual-speed floppy supported

JP11/jumper 5

closed

Floppy drive Precomp. is scaled by data rate:

500KHz=125ns, 300KHz=208ns, 250KHz=250ns

JP11/jumper 6

open

 

Precomp. fixed at 125ns for all data rates.

JP11/jumper 6

closed

Hard drive port address 1F0-1F7h

JP12

open

 

Hard drive port address 170-177h

JP12

closed

Chassis ground is connected to logic ground

JP16

closed

 

Chassis ground is not connected to logic ground

JP16

open

Floppy controller enabled

JP17

closed

 

Floppy controller disabled

JP17

open

Hard Drive Interrupt is IRQ14

JP20

pins 2 & 3 closed

 

Hard Drive Interrupt is IRQ15

JP20

pins 1 & 2 closed

BIOS ADDRESS

Address

JP10/jumper 1

JP10/jumper 2

JP10/jumper 3

 

Disabled

open

open

open

C800h

open

open

closed

 

CC00h

open

closed

open

 

D000h

open

closed

closed

 

D400h

closed

open

open

 

D800h

closed

open

closed

 

DC00h

closed

closed

open

 

Disabled

closed

closed

closed