tschak909 Posted March 11, 2007 Share Posted March 11, 2007 So far the kernel seems to be coming along very nicely, I was finally able to implement a smooth scrolling algorithm by unrolling everything.... but I have some other problems that have come up: * The first digit for the score is garbled, not sure why.. it's looking like a mangled pointer somehow.... * The scroll completes, then starts at the very beginning again. I suspect this is because i am updating state during overscan.. do I need to move the bounds enforcement (basically the AND), in-kernel? I am pasting source and a screenshot.. but I'm showing some progress! and the current code: salmonrun_070311.zip Until next time! -Thom Quote Link to comment Share on other sites More sharing options...
SeaGtGruff Posted March 11, 2007 Share Posted March 11, 2007 * The first digit for the score is garbled, not sure why.. it's looking like a mangled pointer somehow.... Yes, this is where it gets mangled: SCOREPTR5 = $CC; ... SCANCOUNTER3 = $CD; and another counter... The one-byte counter SCANCOUNTER3 is overlapping the two-byte pointer SCOREPTR5. Michael Quote Link to comment Share on other sites More sharing options...
SeaGtGruff Posted March 11, 2007 Share Posted March 11, 2007 This is also looks wrong: PF1DATA = $81; 32 bytes of PF1. PF2DATA = $A0; 32 bytes of PF2. SCANCOUNTER = $C0; a scanline counter. If PF1DATA is supposed to be 32 bytes, then PF2DATA should start at $A1, and SCANCOUNTER should start at $C1, with everything after that getting shifted 1 byte as well. Michael Quote Link to comment Share on other sites More sharing options...
tschak909 Posted March 11, 2007 Author Share Posted March 11, 2007 ahhh! thanks, yeah.. that would do it! Quote Link to comment Share on other sites More sharing options...
+Andrew Davie Posted March 11, 2007 Share Posted March 11, 2007 So far the kernel seems to be coming along very nicely, I was finally able to implement a smooth scrolling algorithm by unrolling everything.... but I have some other problems that have come up: * The first digit for the score is garbled, not sure why.. it's looking like a mangled pointer somehow.... * The scroll completes, then starts at the very beginning again. I suspect this is because i am updating state during overscan.. do I need to move the bounds enforcement (basically the AND), in-kernel? I am pasting source and a screenshot.. but I'm showing some progress! and the current code: salmonrun_070311.zip Until next time! -Thom To avoid this sort of variable clashing, I suggest you try the following... SEG.U variables ORG $80 ; define your variables here ; this is an uninitialised segment -- the assembler will calculate addresses, but create no actual data in the binary ; examples... GAME_STATUS ds 1 ; 1 byte for this var! PF1DATA ds 32 ; 32 for this one PF2DATA ds 32 ; and this ; this allows you to insert/remove variables at will, and resize, without having to recalculate! ; in other words, let the assembler calculate the locations of stuff, you just state how big they are! SEG code ORG $F000 ; rest of your program here Quote Link to comment Share on other sites More sharing options...
SeaGtGruff Posted March 11, 2007 Share Posted March 11, 2007 Excellent idea, Andrew! I need to start doing that, too. Michael Quote Link to comment Share on other sites More sharing options...
gambler172 Posted March 11, 2007 Share Posted March 11, 2007 Hi Thom The old Salmon Run on the VCS? Greeaatt Cannot wait to see a playable bin. greetings gambler172 Quote Link to comment Share on other sites More sharing options...
tschak909 Posted March 11, 2007 Author Share Posted March 11, 2007 Yes indeed, i was always a huge fan of that game (and ALL of Bill Williams' stuff!), and I want to do a solid port (I think we can even improve on the graphics a bit since it is very vertically oriented!) I'm progressing very quickly on this, quite amazing considering this is my first game attempt on the VCS! Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.