Bernd Walter wrote:
On Sat, Dec 03, 2005 at 12:32:49AM +0100, Wilko Bulte wrote:
On Fri, Dec 02, 2005 at 10:36:14PM +0000, Peter Grehan wrote..
grehan 2005-12-02 22:36:14 UTC
FreeBSD src repository
Added files:
sys/dev/ic via6522reg.h
Log:
Register definitions for the ancient via6522. This 20+ year-old chip
still exists as a cell in the Macio asic on Apples, and is used to communicate
through the shift register with the external PMU microcontroller.
Ah... our famous Versatile Interface Adapter chip! I'm more familiar
with the 682[01] but this one is nicer ;)
Mmmm - very interesting stuff - I used the 6522 as well as the 6821
on many self build 6502 and 68k based systems.
Usually a single 6522 to get system timers and then 6821 for firther
GPIO.
Since it's only a small step to the 6526: can we expect a C64 port
soon ;-)
But honestly - I wasn't aware that a modern computer system still uses
them.
I still use one all the time in my Commodore 1541 floppy drive. :) The
6522 showed up as a chip in the original Macintosh (and an Apple II
mouse card) and then the core of it was integrated into various VLSI chips.
http://www.folklore.org/StoryView.py?project=Macintosh&story=Apple_II_Mouse_Card.txt
http://folklore.org/StoryView.py?project=Macintosh&story=Macintosh_Prototypes.txt
--
Nate
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