Re: Informations about JiffyDOS

From: Spiro Trikaliotis (
Date: 2001-03-15 10:26:29

Hi Carlsson,

> I thought the VIC-20 hardware was inferior, and can't transfer data as
> fast as the C64 can (new serial devices or something). Also, it was for
> compatibility reasons the 1541 didn't utilize faster routines from the
> beginning. I might be wrong, but I think I've read about this before.

No, it's the opposite.

With the normal kernal-routines, the VC-20 can transfer "at full speed".
That's not true for the C64 because it's VIC-II can interrupt the processor.
For this reason, the 1541 was slowed down. Entering the VIC-20-mode meant to
"remove" this slowing down (although, it is not really necessary).


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