Thread: CIA doubts
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Old 08 July 2017, 22:51   #1
Defendit numerus

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Join Date: Mar 2017
Location: Crossing the Rubicon
Age: 50
Posts: 2,997
CIA doubts

Hi, lately I'm doing tests with CIAs.
And an academic question arised (in fact I have not read any manuals about it ).

The data lines usage (D0:7 for CIAA, D8:15 for CIAB) explain the odd and even address usage.
And can image that if in address space 64KB is 'available' address lines to select is $

The question: both CIAs 'lives' in the same space? If yes, a word write cross both?
Or simply there is an assigned bit in address lines that select a single CIA?
But then for what reason they decided to split the data bus line usage?

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