Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!cs.utexas.edu!uunet!nuchat!seven
From: seven@nuchat.UUCP (David Paulsen)
Newsgroups: comp.sys.cbm
Subject: Re: 6522 chip specifications
Message-ID: <14339@nuchat.UUCP>
Date: 9 Sep 89 01:04:14 GMT
References: <915NETOPRBH@NCSUVM>
Reply-To: seven@nuchat.UUCP (David Paulsen)
Organization: Crazy Dave's Computer Emporium, Houston
Lines: 43

In article <915NETOPRBH@NCSUVM> NETOPRBH@NCSUVM.BITNET (Brandon Hill) writes:
>Does anyone have any info on the 6522 I/O chip (the one used in the 1541) ?
>
>Even just a pin-out description of the chip would be helpful.  Are there any
>reference books with this information?
>                                                     BlH

I'm looking at page 107 of _The Complete Commodore Inner Space Anthology_, 
a book published in 1985 by Karl Hildon, once-editor of The Transactor.
Page 107 contains pinouts for most (if not all) of the Commodore chips,
including the 6522 and 6526.

The 6522 is remarkably like the 6526, with the following exceptions:

PIN   6522   6526
------------------
 18    CB1    PC 
 19    CB2    TOD
 |
 23    CS2    CS
 24    CS1    FLAG
 |
 26    D7     DB7
 27    D6     DB6
 28    D5     DB5
 29    D4     DB4
 30    D3     DB3
 31    D2     DB2
 32    D1     DB1
 33    D0     DB0
 |
 39    CA2    SP
 40    CA1    CNT

Beyond that, the book does not say much more.  

David

-- 
David Paulsen    ..uunet!nuchat!seven  ||| The Curiosity Shop BBS, 713/488-7836
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"She moans.  He moves the camera up, slowly, deeper inside her, f/22 at 1/60th
 of a second..."  --Dark Thoughts, from the Mind Of Minolta