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