CNT-AT2 Hard Disk/Floppy Controller Settings and Configuration
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 | |
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