From 65e93275c17c14eea06d495958ed77fe569ce8f1 Mon Sep 17 00:00:00 2001
From: alekseiplusplus <alekseijeaves@protonmail.com>
Date: Mon, 1 May 2023 14:16:00 +1000
Subject: changed directory structure, and other minor stuff

---
 headers/6502.h | 123 ---------------------------------------------------------
 1 file changed, 123 deletions(-)
 delete mode 100644 headers/6502.h

(limited to 'headers/6502.h')

diff --git a/headers/6502.h b/headers/6502.h
deleted file mode 100644
index 3a48edc..0000000
--- a/headers/6502.h
+++ /dev/null
@@ -1,123 +0,0 @@
-//	6502.h
-//	Core elements of the 6502 CPU
-
-typedef unsigned char\
-	byte;
-typedef unsigned short\
-	address;
-
-byte acc, X, Y, P, S = 0x00;
-address PC = 0x0000;
-byte* Memory; // TO DO. Add expansion capability to memory.
-
-//	FLAGS
-#define flag_N 0x80 // Negative
-#define flag_V 0x40	// Overflow
-#define flag_B 0x10	// BRK command
-#define flag_D 0x08	// Decimal mode
-#define flag_I 0x04	// IRQ disable
-#define flag_Z 0x02	// Zero
-#define flag_C 0x01	// Carry
-
-byte getFlag(byte flag) {
-	return ((P & flag) == flag) ? 1 : 0;
-}
-
-void setFlag(byte flag, int x) {
-	if (x == 1){
-		if ((P & flag) == 0x0)	P += flag;
-	}else if (x == 0){
-		if ((P & flag) == flag)	P -= flag;
-	}
-	else{
-		fprintf(stderr, "setFlag() passed arg neither 0 or 1");
-	}
-}
-
-void flagSet(byte flag){
-	P |= flag;
-}
-
-void flagClear(byte flag){
-	P &= ~flag;
-}
-
-
-//	BCD
-// need to actually look into BCD on the 6502
-byte toBCD(byte x){
-	if (x < 100){
-		byte a = ((x / 10) << 4);
-		byte b = (x % 10);
-		return (a + b);
-	}
-	else{
-		fprintf(stderr, "Number greater than 99 passed to toBCD()");
-	}
-}
-
-byte fromBCD(byte x){
-	byte a = ((x >> 4) * 10);
-	byte b = (x & 0xF);
-	return (a + b);
-}
-
-
-//	Functions which perform reusable routines for finding if a specific flag should be set.
-
-void setFlagN(byte x){
-	if (x & flag_N == flag_N)
-		setFlag(flag_N, 1);
-	else
-		setFlag(flag_N, 0);
-}
-
-//Perform prior to any changes
-void setFlagV(byte x, byte y){
-	if ((x & flag_N) == (y & flag_N)){
-		if (((x + y) & (flag_N ^ 0xFF)) > 0x7F) setFlag(flag_V, 1);
-		else setFlag(flag_V, 0);
-	}else{
-		if (((x - y) & (flag_N ^ 0xFF)) > 0x7F) setFlag(flag_V, 1);
-		else setFlag(flag_V, 0);
-	}
-}
-
-/*void setFlagB(){ //WORK ON
-	setFlag(flag_B, 1);
-}*/ //Dont really need since its dependent on the BRK insturction
-
-/*void setFlagD(){
-	setFlag(flag_D, 1);
-}*/
-
-/*void setFlagI(){ //WORK ON
-	setFlag(flag_Z, 1);
-}*/
-
-void setFlagZ(int x){
-	if (x == 0)
-		setFlag(flag_Z, 1);
-	else
-		setFlag(flag_Z, 0);
-}
-
-//Only 6 instructions, 2 not including stack instructions, use the carry flag.
-// Need to look further into implementation details for this.
-/*void setFlagC(){
-	setFlag(flag_Z, 1);
-}*/
-
-
-//	Memory Manipulation
-//need to add special conditions for D0 and FF
-
-
-byte getMemory(address x){
-	return Memory[x];
-}
-
-void setMemory(address x, byte y){
-	Memory[x] = y;
-}
-
-- 
cgit v1.2.3