Subject: Re: [stella] Source Code From: Eckhard Stolberg <Eckhard_Stolberg@xxxxxxxxxxxxxxxxxxxxx> Date: Wed, 04 Mar 1998 22:38:35 +0100 |
>Please let me know if anyone has a problem with me posting their code, and >I'll promptly take it down. Glenn if you wish to keep posted source as >proprietary to the list that's fine too. As I said I'm just looking for >help and was trying to make things easier. Any comments or suggestions are >more than welcome. Complete corrected code able to run under DASM would be >fantastic! :) The code, that I posted was meant to demonstrade some effects only and is pretty useless without the explaining mails, that I posted it with, since I didn't comment the source code that much. But you can keep it on your webpage, if you want to. I checked your changes to my code to see, why it would not assemble with DASM. The problem seems to be the definition of variables. In ASM6502 I can use ORG $80 Name1 DS 5 Name2 DS 1 to define some space for Name1 and Name2. In DASM the ORG also causes the ROM image to start at address $0080, which is not intended. To work around this you could replace the above sequence with Name1 = $80 Name2 = $85 Name3 = $86 etc. Also the SAY.A65 program would not do anything, because I left out all the sample data. You have to add in 3840 sample bytes at the position where it says 'insert sample data here'. Since the volume is only 4 bits large each byte holds two sample values. If you want the original data, you could use DISTELLA from Bob Colbert's page on the BIN file, that I posted with the source code. The TRICK.A65 code has some lines with a double comment, like STA $86 ;RESP0 ;3 The $86 is only a dummy RAM address. If you replace it with the RESPx behind it, the program would display 15 sprites per scanline. Unfortunately this trick doesn't work as well on a real VCS as it does on PCAE. I tried it on a Space Invaders game and it didn't look that good. I reused that code for some light gun experimentations, but since it looks bad and shooting Space Invaders with a light gun is not much fun, I will not devellop it any further. So, if anyone has a good idea for a light gun game, I would like to hear it. :-) Ciao, Eckhard Stolberg -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html Don't post pirate BINs to Stellalist. Be a programmer, not a pirate. Write the best game, win framed autographs of famous Atari alumni!!
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
Re: [stella] Source Code, Chris Cracknell | Thread | RE: [stella] Source Code, A. |
RE: [stella] Supercharger Questions, Eric Christensen | Date | Re: [stella] Supercharger Questions, Chris Wilkson |
Month |