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AHA-1520, AHA-1522
| Data bus: | 16-bit, ISA |
| Size: | Half-length, full-height card |
| Hard drives supported: | Up to seven SCSI devices |
| Floppy drives supported: | Two 360KB, 720KB, 1.2MB or 1.44MB |
| CONNECTIONS | |
|---|---|
| Function | Location |
| 34-pin data cable connector-floppy drive | CN1 |
| 50-pin SCSI cable connector-internal | CN2 |
| 50-pin SCSI cable connector-external | CN3 |
| USER CONFIGURABLE SETTINGS | ||
|---|---|---|
| Function | Location | Setting |
 Data transfer in DMA disabled |
J5/jumper 1 | open |
| Data transfer in DMA enabled | J5/jumper 1 | closed |
| Boot enabled (Intercept INT19 call) |
J5/jumper 2 | closed |
| Boot disabled (INT19 normal) | J5/jumper 2 | open |
| Synchronous negotiation enabled |
J5/jumper 5 | closed |
| Synchronous negotiation disabled | J5/jumper 5 | open |
| Disconnect by target / INT15 enabled |
J5/jumper 6 | closed |
| Disconnect by target / INT15 disabled | J5/jumper 6 | open |
| Factory configured - do not alter |
J5/jumpers 7 & 8 | open |
| USER CONFIGURABLE SETTINGS | ||
|---|---|---|
| Function | Location | Setting |
| SCSI parity check enabled |
J6/jumper 8 | open |
| SCSI parity check disabled | J6/jumper 8 | closed |
| Floppy drive enabled |
J7/jumper 1 | closed |
| Floppy drive disabled | J7/jumper 1 | open |
| Floppy drive Interrupt is IRQ6 |
J7/jumper 6 | closed |
| Floppy drive Interrupt is IRQ10 | J7/jumper 7 | closed |
| Floppy drive-dual speed disabled |
J7/jumper 8 | open |
| Floppy drive-dual speed enabled | J7/jumper 8 | closed |
| I/O port address 340h |
J9/jumper 5 | open |
| I/O port address 140h | J9/jumper 5 | closed |
| SCSI ADDRESS | |||
|---|---|---|---|
| SCSI ID | J6/jumper 1 | J6/jumper 2 | J6/jumper 3 |
| 0 | open | open | open |
| 1 | closed | open | open |
| 2 | open | closed | open |
| 3 | closed | closed | open |
| 4 | open | open | closed |
| 5 | closed | open | closed |
| 6 | open | closed | closed |
| 7 |
closed | closed | closed |
| DMA CHANNEL | ||||||
|---|---|---|---|---|---|---|
| DMA | J6/6 | J6/7 | J8/1 & 5 | J8/2 & 6 | J8/3 & 7 | J8/4 & 8 |
| 7 | closed | closed | closed | open | open | open |
| 6 | open | closed | open | closed | open | open |
| 5 | closed | open | open | open | closed | open |
| 0 |
open | open | open | open | open | closed |
| INTERRUPT REQUEST | ||||||
|---|---|---|---|---|---|---|
| IRQ | J6/4 | J6/5 | J9/1 | J9/2 | J9/3 | J9/4 |
| IRQ9 | open | open | open | open | open | closed |
| IRQ10 | closed | open | open | open | closed | open |
| IRQ11 |
open | closed | open | closed | open | open |
| IRQ12 | closed | closed | closed | open | open | open |
| BIOS ADDRESS | |||
|---|---|---|---|
| Address | J9/jumper 6 | J9/jumper 7 | J9/jumper 8 |
| DC000h |
closed | closed | closed |
| C8000h | open | open | closed |
| CC000h | open | closed | closed |
| D8000h | closed | open | closed |
| Disabled | N/A | N/A | open |
| FLOPPY DRIVE DMA - J7 | ||||
|---|---|---|---|---|
| DRQ | DACK | |||
| DMA | Jumper 2 | Jumper 3 | Jumper 4 | Jumper 5 |
| DMA Channel 2 |
closed | open | closed | open |
| DMA Channel 3 | open | closed | open | closed |
| MESSAGE SELECT | ||
|---|---|---|
| Msg #0 - Adaptec Header Msg #1 - Jumper config. info. Msg #2 - SCSI device info. | ||
| Msg #3 - Boot Progress info. Msg #4 - Error messages | ||
| Message | JP5/jumper 3 | JP5/jumper 4 |
| Msg 0 and 4 |
open | open |
| Msg 0, 3 and 4 | open | closed |
| All messages displayed | closed | open |
| Msg 4 only | closed | closed |
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