minerscale
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Posts posted by minerscale
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So I was making some kind of image display on the '2600 and I'm getting weird offset 1/3 and 2/3 through the screen. Does anyone know what the problem is and how to fix it?
Below is a copy of the program and a screenshot of the problem.
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Ahh that makes sense now, Thanks!
Is this a 6502 thing or an Atari 2600 thing in general?
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Hi guys, I'm just starting 2600 after making a game for the genesis in C. I'm quite enjoying the ridiculous challenge of doing it and i'm interested in the properties of adc and the carry flag.
Why does adc add one more to the accumulator when the carry flag is set? It seems quite random that it would be doing that. It's sort of useful but a pain in the ass at the same time. I end up having to call clc wasting 2 cycles in the process.
I'm very confused as to why. So any insight into that would be great.
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Hi guys, I'm just starting 2600 after making a game for the genesis in C. I'm quite enjoying the ridiculous challenge of doing it and i'm interested in the properties of adc and the carry flag.
Why does adc add one more to the accumulator when the carry flag is set? It seems quite random that it would be doing that. It's sort of useful but a pain in the ass at the same time. I end up having to call clc wasting 2 cycles in the process.
I'm very confused as to why. So any insight into that would be great.
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I got Shenzhen I/O
Such a fun game
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Strange behaviour of background 1/3 and 2/3 through the screen?
in Atari 2600 Programming
Posted · Edited by minerscale
Yay! I fixed it! Turned out I was crossing a page boundary with my absolute,Y addressing mode only sometimes, so it offset the picture sometimes.
It's fixed now. However, now it inherently takes up more space, because I have to put each column in it's own page.
Now, I have to input the data byte by byte. :/