[stella] Reading T1024T?

[seagtgruff at aol.com]

T1024T is a write register. You can (try to) read a write register-- but I don't see how it would return anything meaningful. (Wouldn't this be exactly like doing LDA $00 when you actually meant to use LDA #$00?) Is T1024T defined within the code-- i.e., could it have been defined incorrectly as $284 (INTIM) instead of $297 (T1024T)? If this is a disassembly from the ROM image, then I presume T1024T was defined correctly from the?"vcs.h" file-- but if it's the original source code, then T1024T might have been defined internally. Is INTIM being read as well? Where did Astroblast fit into the schedule of M Network releases-- was it one of the earliest? Perhaps the programmer just made a mistake?

Michael


-----Original Message-----
From: Dennis Debro <dennis at debrofamily.com>
To: 'Atari 2600 programming list' <stella at atari2600.org>
Sent: Sun, 23 Dec 2007 11:48 pm
Subject: [stella] Reading T1024T?



Hi there,

I was looking at Astroblast and notice the programmer is reading T1024T. I
assume he's doing this to see if the timer has expired. Is this valid? All
documents I've read have mentioned reading INTIM or checking TIMINT for
this.

Take care,
Dennis



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