Re: Tape questions

From: Rhialto (
Date: 2001-09-22 18:48:02

On Fri 07 Sep 2001 at 09:34:15 +0300, Marko Mäkelä wrote:
> I was surprised to see that the PAL C64 (or C128 in C64 mode) uses
> different tape frequencies from the PAL C128.  Also the C64 does not use
> the same timer values as the VIC-20.  The difference between the C64 and
> PET tape frequencies is much bigger than the clock speed difference.

I remember reading that the tape reading routines are able to adjust to
variations in tape speed quite a bit. So even though the various models
use different timings, (in theory) they should all be able to read all
those tapes.

I know from studying the tape reading routines that they are quite
complicated, using various counters and timers and interrupt vectors. I
think they are the most difficult part of the whole kernal to
understand. I never completely succeeded anyway.

> 	Marko
___ Olaf 'Rhialto' Seibert - rhialto@     --Soep van de dag, wat zal dat zijn
\X/ --wat kan dat wezen, beter maar het ergste vrezen -Boy Bensdorp

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