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Tetris (NES, Nintendo)/ROM map: Difference between revisions
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(a few more) |
(Clarification (I don't like ROM maps that assume iNES format)) |
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{{Rommap|game=Tetris}} | {{Rommap|game=Tetris}} | ||
All addresses are in CPU address space, not iNES file space. | All addresses are in CPU address space, not iNES file space. Subtract $7FF0 for addresses within the iNES file, or use a more sophisticated algorithm for addresses within the UNIF file. | ||
<pre> | <pre> | ||
; Code: | ; Code: | ||
Revision as of 21:14, 18 June 2006
The following article is a ROM map for Tetris (NES, Nintendo).
All addresses are in CPU address space, not iNES file space. Subtract $7FF0 for addresses within the iNES file, or use a more sophisticated algorithm for addresses within the UNIF file.
; Code:
reset = $FF00
main = $8000
soundWaitVBL = $AA45 ; Run sound code and wait for vblank NMI
turnOnNMI = $AA6B ; Turn on interrupt at scanline 241
turnOffNMI = $AA78 ; Turn off interrupt at scanline 241
clearNametable = $AA82 ; Clear nametable whose base address is A
clearVRAM = $AC1C ; If A < $1F, clear Y pages of VRAM to X
; Otherwise, clear 4 pages of VRAM to X and clear attribute table to Y
clearRAM = $AC6A ; Clear pages X to Y of CPU RAM to value in A
switch = $AC82 ; Jumps to the Ath 16-bit address in the following jump table,
; similar to the "magic jump" in Super Mario Bros.
playSound = $E000 ; Appears to be sound code, called every frame
; Data:
initHiScores = $AD67 ; High score table, copied to $0700 on boot