Re: Serial IEC bus for PETs

From: Nicolas Welte (
Date: 2000-11-07 13:35:04

Martijn van Buul wrote:
> wrote:
> > I highly encourage you to use the vic-20's IEC routines.  The PETs dont
> > suffer the timing issues the c64 and c128 do, and thus can benefit from
> > the vic20's noticeably faster routines.
> That's why I opted for the VIC-20 routines in the first place. However,
> Ruud has a point here: The C64-kernal is available in source, the VIC-20
> one isn't, AFAIK.

I wonder if there is a difference between VIC-20 and C64 routines at
all, apart from obvious changes due to different I/O setups and clock
speed. The slowdown in timing is in the 1541, I thought after switching
off the screen on the C64 and putting it the 1541 into 1540 mode it is
as fast as with the VIC-20.

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