Difference between revisions of "Decode Opcodes"
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[[Category:BASIC_ROM_Analysis_Programs]] | [[Category:BASIC_ROM_Analysis_Programs]] | ||
| − | This program decodes Assembly Mnemonics from the [[ | + | This program decodes Assembly Mnemonics from the [[6502_BBC_BASIC#BASIC_4.2C_HIBASIC_4.2C_1984|BASIC 4]] ROM. |
<pre> | <pre> | ||
Latest revision as of 21:41, 8 March 2015
This program decodes Assembly Mnemonics from the BASIC 4 ROM.
10 PRINT"NUM MNE OPCODE"'"--- --- ------"
20 FOR c%=0 TO &44
30 b%=?(&8892+c%)
40 b%=b% DIV 4
50 b%=b% AND &1F
60 b%=b% OR &40
70 L1$=CHR$b%
80 b%=?(&884D+c%)
90 b%=b% DIV 32
100 b%=b%+16*(ABS((?(&8892+c%) AND &02)=&02))
110 b%=b%+8*(ABS((?(&8892+c%) AND &01)=&01))
120 b%=b% AND &1F
130 b%=b% OR &40
140 L2$=CHR$b%
150 b%=?(&884D+c%)
160 b%=b% AND &1F
170 b%=b% OR &40
180 L3$=CHR$b%
190 PRINT RIGHT$("0"+STR$~(c%),2);" ";L1$;L2$;L3$;" ";RIGHT$("0"+STR$~?(&88D7+c%),2);" b1=";RIGHT$("0"+STR$~?(&884D+c%),2);" b2=";~?(&8892+c%)
200 NEXTc%
