Re: Theorizing: cloning CBM electronics with modern technology.

Hallo groepaz,


> no, he probably means this:
> 
> https://github.com/ThKattanek/1541-rebuild

Thank you for the link!

But to be honest, I lean more to an even simpler solution: 
connecting the SD card directly to the 6522. But I'm sure this will 
come with a penalty: speed. IIRC the 1541 collects a byte from the 
floppy every 23 uSec. Collecting 8 bits by bit banging and rolling 
them into a byte will cost much more time:
- toggle clock bit of SD
- read bit into bit 7
- roll bit into Carry
- roll Carry into end byte
- toggle clock bit of SD
Rough guess: 17 uSec for one bit?

Let's face it (again) Ruud, the uController solution is better.


--
   
Kind regards / Met vriendelijke groet, Ruud Baltissen
www.Baltissen.org