From 38c238150e9707fed0b9e8602e24bf91a7ffe4e3 Mon Sep 17 00:00:00 2001 From: alekseiplusplus Date: Mon, 27 Mar 2023 17:18:50 +1100 Subject: Added debug.c --- debug.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 debug.c (limited to 'debug.c') diff --git a/debug.c b/debug.c new file mode 100644 index 0000000..ec6a75a --- /dev/null +++ b/debug.c @@ -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; + } +} \ No newline at end of file -- cgit v1.2.3