20 Feb
2006
20 Feb
'06
4:54 p.m.
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