Jump to content

minerscale's Photo

minerscale

Member Since 28 Jan 2017
OFFLINE Last Active Mar 24 2017 9:54 PM

Topics I've Started

Strange behaviour of background 1/3 and 2/3 through the screen?

Fri Mar 24, 2017 3:10 PM

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.


Why does adc behave as it does?

Mon Feb 13, 2017 1:25 AM

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. :???:


Why does adc behave as it does?

Mon Feb 13, 2017 1:24 AM

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. :???: