Parameter Creation: Difference between revisions
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Count Zero (talk | contribs) (Created page with "WORK IN PROGRESS ... this will be hefty ... <syntaxhighlight lang="6502acme"> BBBE 78 SEI ;start of your actual loader code. BBBF A9 08 LDA #$08 ;this varies from game to game. BBC1 85 BA STA $BA ;remember you have to crack the loader first! BBC3 A9 01 LDA #$01 ;once you have cracked the game BBC5 85 B9 STA $B9 ;place your loader code here BBC7 8D 19 D0 STA $D019 BBCA A9 00 LDA #$00 BBCC 85 9D STA $9D BBCE 8D...") |
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WORK IN PROGRESS ... this will be hefty ... | {| class="wikitable" cellspacing="0" cellpadding="0" width=50% style="background-color: #FFCCCC; border:2px solid #FF3333; padding:0px;" | ||
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WORK IN PROGRESS ... this will be hefty ... and take some time!</div> | |||
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<hr> | |||
With [https://www.lemon64.com/forum/viewtopic.php?t=79851 this lemon post] '''$olo1870''' triggered us to finally do something about [[Parameters]].<br> | |||
The forum post resulted on what written below. Feel free to leave a comment on Lemon! | |||
<hr> | |||
<syntaxhighlight lang="6502acme"> | <syntaxhighlight lang="6502acme"> | ||
BBBB 02 ??? ;start of parameter will always be BB BB 02. | |||
BBBC 29 04 AND #$04 ;02 is always followed by the address in | |||
;memory where the code will be stored. | |||
;In this case $0429 | |||
BBBE 78 SEI ;start of your actual loader code. | BBBE 78 SEI ;start of your actual loader code. | ||
BBBF A9 08 LDA #$08 ;this varies from game to game. | BBBF A9 08 LDA #$08 ;this varies from game to game. | ||
Latest revision as of 22:44, 26 September 2022
WORK IN PROGRESS ... this will be hefty ... and take some time!
|
With this lemon post $olo1870 triggered us to finally do something about Parameters.
The forum post resulted on what written below. Feel free to leave a comment on Lemon!
BBBB 02 ??? ;start of parameter will always be BB BB 02.
BBBC 29 04 AND #$04 ;02 is always followed by the address in
;memory where the code will be stored.
;In this case $0429
BBBE 78 SEI ;start of your actual loader code.
BBBF A9 08 LDA #$08 ;this varies from game to game.
BBC1 85 BA STA $BA ;remember you have to crack the loader first!
BBC3 A9 01 LDA #$01 ;once you have cracked the game
BBC5 85 B9 STA $B9 ;place your loader code here
BBC7 8D 19 D0 STA $D019
BBCA A9 00 LDA #$00
BBCC 85 9D STA $9D
BBCE 8D A1 02 STA $02A1
BBD1 85 A3 STA $A3
BBD3 85 94 STA $94
BBD5 20 A5 F4 JSR $F4A5 ;point BB BB 04 here
BBD8 20 BB 05 JSR $05BB
BBDB 78 SEI
BBDC 68 PLA
BBDD 68 PLA
BBDE 85 01 STA $01
BBE0 18 CLC
BBE1 60 RTS ;end of loader code
BBE2 BB ??? ;BB BB 04 followed by the address in memory
BBE3 BB ??? ;$f4a5 is located at after the code has been
BBE4 04 ??? ;placed. In this case BB BB 04 41 04. So
BBE5 41 04 EOR ($04,X) ;it is located at $441. This allows the cart
;to replace $f4a5 with its own fast loader.
BBE7 BB ??? ;end of parameter.
BBE8 BB ??? ;Always ends BB BB 00
BBE9 00 BRK
