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From: Rachy (all posts)
Date: 1998-07-03
Subject: Re: Turbo emulating

Ahoj!

> What would happen, if you avoided asynchron communication, and
> you used synchronised data flow instead?
Async? It wouldn't work... ;) The only way is sync of course... (How can I read on the Amiga side, and write something completely different on the 1541 side??)

> Since ATN can't be written by the drive, it would make sense to use
> CLK and DATA as datalines, and make them synchronised by alternating
> between 0's and 1's on the ATN line from the Amiga. The synchronising That's nice, but there is a bit problem with this: 1541 cannot put data on lines right after ATN is flipped... It takes a bit time, and the stable sign-stand on the lines also takes a bit time... And this time is what I want to know... (Sajnos nem tudom mi angolul a pergesmentesites... Sorry english-only guys...)

I am afraid I have to count it by a test.

> Maybe, this would mean a small loss of the speed, in opposition of a
> programmed, cycle timed data-transfer, but it would work much more
> reliably (...at least, 'cos you can't present exact timing for all
> Amiga versions with all processor and memory types, not to mention the
> multitasking kernel of the Amiga OS).
Not necessary loss of speed. The Amiga side can be as fast as the drive.
You wouldn't know the possibilities of the Amiga OS. There IS exact timing of course... (And I could even forbid multitasking, if it is a must.)

> Ps. How about contacting Joe Forster (...Kovacs Balazs), author of Star
> Commander, 1541 handler for DOS? ...He may have had these problems too,
> when programming his Commander. BTW, I'm sure you'll meet him at Scenest.
Unfortunately I am not able to be at Rage-Scenest, as I wrote a letter before this.

Bye:
Rajnai Almos

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| Rachy of Bi0Hazard | Only Amiga makes it |TankcsapdaMeta| F0NT! |
|e-mail: racs@fs2.bdtf.hu | possible! |llicaHelloween| Editor|
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