Article View: comp.sys.amiga.tech
Article #1342Re: State of PD system enhancement (was: Two Amigas)
From: Dave Haynie
Date: Tue, 19 Sep 1989 16:28
Date: Tue, 19 Sep 1989 16:28
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1598 bytes
in article <34.filbo@gorn.santa-cruz.ca.us>, filbo@gorn.santa-cruz.ca.us (Bela Lubkin) says:
> X-Claimer: I >am< R Pentomino!
> What happens if you Forbid() as the block starts, can you get away with
> cycle counting?
One big problem is that you never know exactly how long it'll take to write
to the CIA chip. It's hooked into the system via the 68000's 6800 family
support mechanism. The CIA runs from a clock that's 6 68000 clocks low,
4 clocks high. When you access the CIA, the 68000 will synchronize to this
free running 716kHz clock; depending on where the 68000 cycle is in relation
to the CIA cycle, this can sync-up can vary quite a bit. So handshaking
between machines is a requirement.
> Bela Lubkin * * filbo@gorn.santa-cruz.ca.us CIS: 73047,1112
> @ * * ...ucbvax!ucscc!gorn!filbo ^^^ REALLY slow [months]
> R Pentomino * Filbo @ Pyrzqxgl (408) 476-4633 & XBBS (408) 476-4945
--
Dave Haynie Commodore-Amiga (Systems Engineering) "The Crew That Never Rests"
{uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy
Too much of everything is just enough
Technical Details
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<7950@cbmvax.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!usc!apple!oliveb!amiga!cbmvax!davehReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!usc!apple!oliveb!amiga!cbmvax!daveh From: daveh@cbmvax.UUCP (Dave Haynie) Newsgroups: comp.sys.amiga.tech Subject: Re: State of PD system enhancement (was: Two Amigas) Message-ID: <7950@cbmvax.UUCP> Date: 19 Sep 89 16:28:36 GMT References: <34.filbo@gorn.santa-cruz.ca.us> Organization: Commodore Technology, West Chester, PA Lines: 21