Subject: [stella] Common 2600 support files submission From: Manuel Rotschkar <cybergoth@xxxxxxxx> Date: Fri, 14 Nov 2003 23:27:41 +0100 |
Hi there! Andrew, please don't kill me for probably forcing you to update update the 2600 support files the third time in three days, but with this I'm done for this year. Promised. :-) The attached ZIP files mainly contains a 4K template, which gives a perfect jumpstart for any 2600 development. It does a safe, complete & working TV frame, yet it has very minimized overhead and is very small and it encapsulates all knowledge about the TV frame in working black-box macros. To achieve this, I added basic PAL/NTSC support to VCS.H and the makros START_VBLANK_TIMER EXPIRE_VBLANK_TIMER START_OVERSCAN_TIMER EXPIRE_OVERSCAN_TIMER to makro.h As an appetizer, here comes the complete template source (All is in the ZIP again): ------------------------------------------------------- ; 4K Template ; Compiles with DASM and is tested Z26. ; Done by Manuel Rotschkar (cybergoth@xxxxxxxx) ; Uncomment for PAL: ; COMPILE_VERSION = PAL processor 6502 include vcs.h include macro.h SEG.U variables ORG $80 frameCounter ds 1 ; Add more variable definitions here SEG Bank0 ORG $F000 Start CLEAN_START JSR Init MainLoop VERTICAL_SYNC START_VBLANK_TIMER ; Add calculations during VBLANK TIME here EXPIRE_VBLANK_TIMER JSR MainScreen START_OVERSCAN_TIMER ; Add calculations during Overscan here EXPIRE_OVERSCAN_TIMER JMP MainLoop Init ; Add Initialisation code here RTS MainScreen STA WSYNC STA VBLANK ; Stop vertical blank ; Replace with your own kernel code from here... LDX #190 DoScreen STA WSYNC STX COLUBK DEX BNE DoScreen ; to here... STA WSYNC LDA $02 STA VBLANK ; Start vertical blank RTS ; Reset Vector ORG $FFFA .word Start .word Start .word Start ------------------------------------------------------- Note: I did not change the version tags of vcs.h & macro.h, so please just take a look at all the stuff, but only use it after Andrew has approved and officially uploaded it. (If he does... at least I hope so :-)) BTW: The latest base adress fix works as intended! Greetings, Manuel
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