cvs commit: src/sys/dev/ic via6522reg.h
nate at root.org
Sat Dec 3 01:30:58 GMT 2005
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
>>> 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 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
> 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
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.
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