Re: Q: Timing: How many clock-cycles to print one char on screen?

[david@uow.edu.au (David Wilson)]

david@uow.edu.au (David Wilson) writes:
>Speaking of Understanding the Apple IIe - has anyone tried the program listings?

>I just tried Figure 8-20 (page 8-45) "LORES80 CONCENTRIC CIRCLES" and it
>doesn't work on my //e. It fails to clear the text region of a mixed
>graphic screen properly (the alternate columns are left with junk in them)
>and the blocks that make up the circles are not drawn after a couple are
>displayed.

Of course now I go back and look at what I typed in and have found two errors
so far. I now get proper clearing of the screen and concentric circles but
the color in odd columns does not match that in even ones. That will either
be another typo or some problem with my RGB card.
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia