+playsoft Posted August 11, 2014 Share Posted August 11, 2014 This is a 5200 version of Alien Swarm with JAC!'s fixes as described here: http://atariage.com/forums/topic/224914-alien-swarm-hack-request/ Instructions can be found here: http://www.atarimania.com/game-atari-400-800-xl-xe-alien-swarm_202.html JAC! provided me with the source code which I've modified for the 5200 and tested on my 4-port with Atarimax Ultimate SD. Edit: updated version below 1 Quote Link to comment Share on other sites More sharing options...
Charlie_ Posted August 11, 2014 Share Posted August 11, 2014 Thank you Paul. Quote Link to comment Share on other sites More sharing options...
Aking Posted August 12, 2014 Share Posted August 12, 2014 amazing work, great game Paul just had hopes for a JAC! video about the hacking and conversion... Quote Link to comment Share on other sites More sharing options...
slampam Posted August 13, 2014 Share Posted August 13, 2014 After awhile of play the colors go funny and the screen goes blank but the game keeps playing unseen. Quote Link to comment Share on other sites More sharing options...
Charlie_ Posted August 14, 2014 Share Posted August 14, 2014 After awhile of play the colors go funny and the screen goes blank but the game keeps playing unseen. I haven't been able to get at my 5200 yet so I can try this. I'll check it out soon and see if get the same problem. Quote Link to comment Share on other sites More sharing options...
+playsoft Posted August 14, 2014 Author Share Posted August 14, 2014 I was able to reproduce it - it occurs when you've got far enough in the game that the snake starts planting red saucers. It's a bug from the original game. There is a table of screen addresses and when it plants a saucer (at the bottom of the screen) it reads beyond the end of the table and ends up incorrectly writing to zero page locations. Once the saucer is bouncing around the screen it is fine, it is only the initial placement of it where the issue occurs. The 5200 and A8 use zero page differently which is why the bug is more evident here, although it could still lead to problems on the A8 original. I made the table of screen addresses longer and it now seems fine, as far as I can get in the game anyway. as_fix.bin Quote Link to comment Share on other sites More sharing options...
+JAC! Posted September 24, 2014 Share Posted September 24, 2014 (edited) Hi there, "poked" by Aking's orginal request and thanks to Paul's excellent help I managed to create a version that compiles both to 5200 and 8000/XL. It includes some more fixes (e.g. 4 digit energy) and is available here: http://atariage.com/forums/topic/224914-alien-swarm-hack-request/?p=3078433 I hope it works on real HW. I never had a 5200 and didn't even know how the controllers work :-) Now I could a least think of a video tutorial. But am actually lacking the time. Yet, the full commented source for the XL/5200 specific parts in the download will be a good start. Edited September 24, 2014 by JAC! Quote Link to comment Share on other sites More sharing options...
walter_J64bit Posted September 24, 2014 Share Posted September 24, 2014 Alien Swarm , I've haven't played this A8 game yet. Quote Link to comment Share on other sites More sharing options...
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