changing PC floppy port address

[Chuck Guzis]

On 2/20/2006 at 11:25 PM ard at p850ug1.demon.co.uk wrote:

>A few IBM cards decoded more of the lines. I forget which ones, but I 
>think it's one of the 'lab I/O' cards, either the GPIB card or the data 
>acquisition adapter. And IIRC, the addresses for the second, third, etc 
>card of the same type differed in the values of some of A10-A15

The DAA decoded 12 bits of the address bus and so allowed up to 4 DAAs.
Same for the cluster adapter and GPIB.  AFAIK, no XT adapter decoded all 16
bits of the address bus, though some third-party devices certainly did.

Chuck