Sockets for 2mb of Fast RAM, CMOS 256K x 4DRAMs 120ns or faster RAM can be
installed as 512K, 1MB, or 2MB

* Autoboot ROMs 16 Kilobytes
* SCSI interface - ANSI X3T9.2 compatible, DB24 SCSI connector,
  50 pin internal SCSI connector
* XT Interface 40pin internal XT connector
* Host interface connects to 86pin connector on the Amiga 500
* Power requirements 117/220/240 VAC 50 watts maximum.


CONNECTOR TYPE: amiga a590 dip switch settings

Switch 1: Autoboot Enable
If you are using Kickstart 1.3, you can set Switch 1 on the ON position.
This will allow you to boot your system from the a590.

Switch 2: LUN Enable
This switch only affects SCSI drives. If you have more than one device at a
phyiscal address set Switch 2 to ON. When this switch is in the OFF position,
the system only looks for one drive, at each physical SCSI address. when this
switch is in the ON position the system will attempt to open Logical Units 0
through 7 at each physical SCSI address.

Note: Some SCSI drives, such as certain Seagate and Epson drives, respond to
more than one logical address. Such drives will appear on the Workbench screen
and the HARD DRIVE PREPARATION, PARTITIONING and FORMATTING screen in HDTOOLBOX
multipe times, at the same address but at LUN 0 through 7. If this occus, set
Switch 2 to OFF.

Switch 3: If you are using a SCSI drive that takes longer than thirty seconds
to start up when you turn the system on, such as some Seagate drives, you may
wish to set Switch 3 to ON. When the switch is in the OFF position the time-out
period, [the time between the startup and when the system checks the drive),
is short. When the Switch is in the ON position the system will wait a longer
time before checking the drive.

Switch 4: Reserved for future use.


CONNECTOR TYPE: amiga a590 Power Connector

1. +5 VDC
2. Ground
3. Power Sense
4. +12 VDC

Looking into the connector, * denotes the 'notch' at the top in the shield

         _ _
       (1.*.4)
       (2. .3)
        -----
Hard disk power connector
.85A Maximum Continuous Current at 12V
2.6A Maximum Startup Current at 12V
1.0A Maximum Continuous Current at 5V

CONNECTOR TYPE: amiga a590 P10 Power Connector

1. +5 VDC
2. Ground
3. Ground
4. +12 VDC

CONNECTOR TYPE: amiga a590 Fan Connector

1. +12 VDC
2. Ground
3. +12 VDC

Jumper Settings

Note: The a590 is shipped with all jumpers set to 1.

Jumper   |   Setting     |    Notes
-------------------------------------------------------------------
JP1       1. Amnesia        RAM memory installed on the a590 board.
          2. 512K
          3. 1MB
          4. 2MB

JP3       1. XT drive       Sets LED for XT or SCSI drive.

JP4       1. Interupt 2     Interupt level.
          2. Interupt 6     Not user adjustable


CONNECTOR TYPE: amiga a590 Internal XT Connector

39 Not Used
37 Select
35 Addr 1
33 Addr 0
31 Int
29 Data-Req
27 Data-Ack
25 OIRead
23 IOWrite
21 Not used
19 Ground
17 Data 0
15 Data 1
13 Data 2
11 Data 3
9 Data 4
7 Data 5
5 Data 6
3 Data 7
1 Reset

Pins 18 and 34 are not used. All other even pins are ground.

CONNECTOR TYPE: amiga a590 External SCSI Connector (DB-25)

Pin  |  Name
-------------
1       REQ
2       MSG
3       I/O
4       RST
5       ACK
6       BSY
7       Ground
8       Data 0
9       Ground
10      Data 3
11      Data 5
12      Data 6
13      Data 7
14      Ground
15      C/D
16      Ground
17      ATN
18      Ground
19      SEL
20      Parity
21      Data 1
22      Data 2
23      Data 4
24      Ground
25      Termination Power

CONNECTOR TYPE: amiga a590 internal SCSI Connector

Pin  |  Name
-------------
50      I/O
48      REQ
46      C/D
44      SEL
42      MSG
40      RST
38      ACK
36      BSY
34      N.C
32      ATN
30      Ground
28      Ground
26      Termination Power
24      Ground
22      Ground
20      Ground
18      Parity
16      Data 7
14      Data 6
12      Data 5
10      Data 4
8       Data 3
6       Data 2
4       Data 1
2       Data 0

All odd pins, except pin 25, are ground. Pin 25 is open.


COMPILED & WRITTEN BY PAUL ANDREWS JR