From: Spiro Trikaliotis (trik-news_at_gmx.de)
Date: 2003-12-19 11:21:47
Hello Ruud,
On Thu, Dec 18, 2003 at 11:54:13AM +0100, Baltissen, GJPAA (Ruud) wrote:
> My question: what area is exactly used: the lower or upper half of
> $Exxx?
I just fired up VICE to check the ROM contents if I could find any
absolute address (JMP or the like) in a 8032. In fact, I can see some,
for example:
$E13D JSR $E16A
$E1BE JMP $E067
Anyway, VICE does not show a mirror at $E900-$EFFF of $E100-$E7FF: In
fact, the $E900-$EFFF area seems to be empty, as I "almost" always
get back the high byte of the address. (i.e., $E900-$E9FF shows $E9 as
contents).
This is *not* fully true for $E800-$E8FF, btw; $E810-$E8FF show other
contents!
Since I don't own a PET, I cannot check if your description if correct
or VICE behaves correctly. Anyway, obviously, only the lower half is
used.
Could anyone please check with a real machine if there is a mirrorering
at $E900-$EFFF?
Spiro.
--
Spiro R. Trikaliotis
http://www.trikaliotis.net/
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