From ee742e6020248f9695cc9ce5bbace5f42814383e Mon Sep 17 00:00:00 2001
From: alekseiplusplus <alekseijeaves@protonmail.com>
Date: Fri, 21 Apr 2023 03:44:47 +1000
Subject: have to call it a night.

---
 applesystem.h | 113 ----------------------------------------------------------
 1 file changed, 113 deletions(-)
 delete mode 100644 applesystem.h

(limited to 'applesystem.h')

diff --git a/applesystem.h b/applesystem.h
deleted file mode 100644
index 6b2f818..0000000
--- a/applesystem.h
+++ /dev/null
@@ -1,113 +0,0 @@
-//	applesystem.h
-//	Core elements of the 6502 CPU, and flag manipulation.
-
-typedef unsigned char byte;
-typedef unsigned short address;
-byte acc, X, Y, P, S = 0x00;
-address PC = 0x0000;
-byte Memory[4096]; // TO DO. Add expansion capability to memory.
-
-//	FLAGS
-const byte flag_N = 0x80;	// Negative
-const byte flag_V = 0x40;	// Overflow
-const byte flag_B = 0x10;	// BRK command
-const byte flag_D = 0x08;	// Decimal mode
-const byte flag_I = 0x04;	// IRQ disable
-const byte flag_Z = 0x02;	// Zero
-const byte flag_C = 0x01;	// Carry
-
-byte getFlag(byte flag) {
-	return ((P & flag) == flag) ? 1 : 0;
-}
-
-void setFlag(byte flag, int x) { //OVERLOAD TO ACCEPT INT AS WELL
-	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);
-}*/
-
-
-
-
-
-
-
-- 
cgit v1.2.3