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| -rw-r--r-- | debug.c | 45 |
1 files changed, 45 insertions, 0 deletions
@@ -0,0 +1,45 @@ +/* + * debug.c is a tool which can be used to interpret 6502 machine code inline. + * Machine code is expected as hexadecimal of length 2 or 6, depending on the instruction. + * Note that zero-page addressing is not fully emulated yet; it will still address the zero-page + section of memory but the instructions still take an address of length 4. + This will be fixed later when the whole system is functional. + * + */ + +#include"include.h" + +int charToNum (char c, int mul) { + if (c != 0x20 && (c >= 0x30 && c <= 0x39)){ + a = (mul * (c - 0x30)); + }else if (c != 0x20 && (c >= 0x41 && c <= 0x46)){ + a = (mul * (c - 0x31)); + } +} + +int main(){ + char c; + unsigned char a, b; + while(true){ + // Pass 1 + c = getchar(); if (c == EOF) break; + a += charToNum(c, 0x10); + // Pass 2 + c = getchar(); if (c == EOF) break; + a += charToNum(c, 0x01); + //Check for next value + c = getchar(); + if (!(c == EOF || c == ' ')) { + // Four passes + b += charToNum(c, 0x1000); + c = getchar(); if (c == EOF) break; + b += charToNum(c, 0x0100); + c = getchar(); if (c == EOF) break; + b += charToNum(c, 0x0010); + c = getchar(); if (c == EOF) break; + b += charToNum(c, 0x0001); + } + runInstruction(a, b); + c = getchar(); if (c == EOF) break; + } +}
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