RE: [cc65] Atari Extended Memory Driver Anybody?

From: Shawn Jefferson <>
Date: 2012-09-10 05:44:51
Yes, the issue was figured out... the flicker is because the character set
data resides in the ROM, and as ANTIC is drawing the screen it sometimes is
getting garbage data because the ROM is off.

Basically, the driver needs to copy the character set to RAM and avoid this
bit for storage.  I want to rewrite the driver anyway, since it doesn't
really need to jump through the stack since main memory should always be
there, which should make the driver simpler and faster.

At the least it shows MULTDEMO run the way it should... loading different
drivers and picking one that works.  Speaking of MULTDEMO, does it only
check a certain number of files in a directory (doesn't seem to, looking at
the code, so maybe it's readdir that does this?)  I noticed putting the
driver further down the directory list causes it to not find the driver.

> From: [] On Behalf
> Of Ullrich von Bassewitz
> I've seen that there is a discussion going on about the flicker. Once
> there is
> a result (or not), I can integrate the driver. Maybe one of the Atari guys
> on
> this list has an idea?

To unsubscribe from the list send mail to with
the string "unsubscribe cc65" in the body(!) of the mail.
Received on Mon Sep 10 05:45:23 2012

This archive was generated by hypermail 2.1.8 : 2012-09-10 05:45:27 CEST