Re: tiny COBOL, Article on new mainframe use

Thomas Koenig <tkoenig@netcologne.de> writes:

Just reading up on this... it seems that there was a bug in the
6522 I/O controller where the shift register sometimes dropped
a bit due to a race condition, and the workaround which was
hastily put in place was very slow.

It was the VIC-20 which had the 6522 with that issue. C64 used a 6526.

C64 floppy access, well, there was bug compatibility reasons and also
some numbnut in production "optimized" away a couple of lines from the
board that would've made disk access reasonably fast. I have a vague
memory there were instructions on how to put those back and how to patch
the ROM routines to use them, around when this came out in Brian
Bagnall's Commodore histories. Can't find anything about it now so maybe
I imagined it.