Article View: comp.sys.amiga.tech
Article #10745Re: CIA Timer Example
From: Dan Baker CATS
Date: Thu, 29 Dec 1988 17:07
Date: Thu, 29 Dec 1988 17:07
28 lines
1664 bytes
1664 bytes
In article <38@sdcc10.ucsd.EDU> cs161agc@sdcc10.ucsd.edu.UUCP
(John Schultz) writes:
>
> [Long CIA timer program deleted....]
>
> What's the scoop? What is the bottom line on these timers? Am I
>reading the docs wrong, or is the documentation inaccurate?
> Timer B on ciaa *should* be available.
CIA-A timer B is reserved for system use. CIA-B timer B is available for
applications. The Hardware Manual is WRONG on this point. Timers are
allocated as follows: -----
CIA A timer A Used for keyboard handshake.
timer B Used for uSec timer.device.
TOD Used for 60 Hz timer.device.
CIA B timer A Commodore 8-bit serial bus communication.
timer B Not used.
TOD Used for graphics.library beam counter.
Use CIA-B timer B for your applications. CIA-B timer A could also be used
although this is reserved for a "1541-style" interface for products like the
64-Emulator. For more on this see Bob Burns' article in the Jan/Feb '89
issue of Amiga Mail coming soon. Also see Paul Higginbottom's example
CIA timer porgram in the Sept/Oct '88 issue of Amiga Mail.
--
Dan Baker, CATS
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!oliveb!amiga!cbmvax!dan From: dan@cbmvax.UUCP (Dan Baker CATS) Newsgroups: comp.sys.amiga.tech Subject: Re: CIA Timer Example Message-ID: <5594@cbmvax.UUCP> Date: 29 Dec 88 17:07:33 GMT References: <1439@percival.UUCP> <5587@cbmvax.UUCP> <38@sdcc10.ucsd.EDU> Reply-To: dan@cbmvax.UUCP (Dan Baker CATS) Distribution: na Organization: Commodore Technology, West Chester, PA Lines: 28