Advantech PCA-6143P User Manual page 42

Positions 1 and 2 on DIP switch SW1 control the disk's I/O
address.
Position 1 Position 2
Off
Off
On
On
Positions 3 and 4 on SW1 control the Flash/ROM disk's memory
address. If you select "Disabled", the disk will not function.
Position 3 Position 4
Off
Off
On
On
Positions 5 and 6 of SW1 control the DOS drive emulated by the
Flash/RAM/ROM disk: 1st, 2nd, 3rd or 4th.
Position 5 Position 6
Off
Off
On
On
The actual drive letter assigned by DOS to the Flash/RAM/ROM
disk depends on the floppy or hard disks installed in the system
and the DOS version.
42 PCA-6143P User's Manual
I/O address (HEX)
Off Disabled
On 200-201
Off 240-241
On 280-281
Memory address (HEX)
Off Disabled
On D2000 to D3FFF
Off D6000 to D7FFF
On DA000 to DBFFF
Drive
Off 4th
On 3rd
Off 2nd
On 1st