Adaptec 1540B/1542B

This is the Adaptec 1540B/1542B SCSI adapter shown. Listed below are the possible Interrupt Request Line (IRQ), Base I/O Address, Base Memory Address, and other jumper/switch configurations:

Setup Choice for Windows NT 3.5
Adaptec 154x

Type of External SCSI Connector
Low Density Shielded

Note: The 1540B and the 1542B were tested with firmware revisions 3.10 and 3.20.

J5  - GENERAL CONTROLS

PIN 1	SYNCHRONOUS TRANSFER NEGOTIATION ENABLE/DISABLE

PIN 2	DIAGNOSTICS (USED ONLY AT ADAPTEC)
PIN 3	SCSI PARITY ENABLE/DISABLE

SCSI 
I.D.	PIN 4	PIN 5	PIN 6
0	ON	ON	ON
1	OFF	ON 	ON
2	ON	OFF	ON
3	OFF	OFF	ON
4	ON	ON	OFF
5	OFF	ON	OFF
6	ON	OFF	OFF
7	OFF	OFF	OFF

DMA 
CHANNEL	PIN 7	PIN 8
0		ON	ON
5		OFF	ON
6		ON	OFF
7		OFF	OFF

IRQ 	PIN 9	PIN 10	PIN 11
9	OFF	OFF	OFF
10	ON	OFF	OFF
11	OFF	ON	OFF

12	ON	ON	OFF
14	OFF	OFF	ON
15	ON	OFF	ON

DMA

SPEED	PIN 12	PIN 13
5	OFF		OFF
5.7	ON		OFF
6.7	OFF		ON
8	ON		ON


J6 - BIOS/AUTO SENSE CONTROL

PIN 1	BIOS ENABLE
PIN 2	NOT USED
PIN 3	NOT USED
PIN 4	NOT USED
PIN 5	AUTO SENSE DISABLE

J7 - ADDRESS SELECTION

PIN 1	FLOPPY SECONDARY ADDRESS SELECT (1542B ONLY)

I/O
ADDRESS	PIN 2	PIN 3	PIN 4
130h		ON	OFF	ON
134h		OFF	OFF	ON
230h		ON	ON	OFF
234h		OFF	ON	OFF
330h		ON	OFF	OFF
334h		OFF	OFF	OFF

BIOS WAIT
STATE SELECT	PIN 5	PIN 6

0			OFF	OFF
100			ON	OFF
200			OFF	ON
300			ON	ON

BIOS
BASE ADDRESS	PIN 7	PIN 8
DC000			OFF	OFF
CC000			ON	OFF
D8000			OFF	ON
C8000			ON	ON

J8 - FLOPPY DISK SELECTION (AHA-1542B ONLY)

Note - On 1542BS100 series, if the floppy enable is removed, remove all jumpers from J8.

PIN 1	FLOPPY ENABLE
PIN 2	DMA REQUEST 2
PIN 3	DMA REQUEST 3
PIN 4	DMA ACK 2
PIN 5	DMA ACK 3

PIN 6	INT REQUEST 6
PIN 7	INT REQUEST 10
PIN 8	DUAL SPEED ENABLE

J9 - DMA/INTERRUPT SELECTION

PIN 1	DMA REQUEST 0
PIN 2	DMA REQUEST 5
PIN 3	DMA REQUEST 6
PIN 4	DMA REQUEST 7
PIN 5	DMA ACK  0
PIN 6	DMA ACK 5
PIN 7	DMA ACK 6
PIN 8	DMA ACK 7
PIN 9	INT REQUEST 9
PIN 10	INT REQUEST 10
PIN 11	INT REQUEST 11
PIN 12	INT REQUEST 12
PIN 13	INT REQUEST 14

PIN 14	INT REQUEST 15

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