From d28ad56810b43cb3ea5d11e5e32042f69ee04562 Mon Sep 17 00:00:00 2001
From: alekseiplusplus <alekseijeaves@protonmail.com>
Date: Fri, 8 Dec 2023 06:52:14 +1100
Subject: major refactor of cpu code

---
 src/cpu/6502.h | 53 ++++++++++++-----------------------------------------
 1 file changed, 12 insertions(+), 41 deletions(-)

(limited to 'src/cpu/6502.h')

diff --git a/src/cpu/6502.h b/src/cpu/6502.h
index bad36fb..41ecb7a 100644
--- a/src/cpu/6502.h
+++ b/src/cpu/6502.h
@@ -6,7 +6,7 @@
 #include"stdio.h"
 #include"core.h"
 
-//	FLAGS
+// CPU Flags
 #define flag_N 0x80 // Negative
 #define flag_V 0x40	// Overflow
 #define flag_B 0x10	// BRK command
@@ -15,50 +15,21 @@
 #define flag_Z 0x02	// Zero
 #define flag_C 0x01	// Carry
 
-byte getFlag(byte flag);
-// Get the value of a flag.
+// Return a truth value of 1 or 0.
+byte GetFlag(byte flag);
 
+// x can be a conditional, and any non-zero value will set the flag.
 void SetFlag(byte flag, int x);
-// Set a flag with some value.
 
-void flagSet(byte flag);
-// Sets some flag.
+// Reusable routines for setting specific flags
+void SetFlag_N(byte x);
+void SetFlag_V(byte x, byte y);
+void SetFlag_Z(int x);
 
-void flagClear(byte flag);
-// Clears some flag.
-
-//	Functions which perform reusable routines for finding if a specific flag should be set.
-
-void SetFlagN(byte x);
-
-//Perform prior to any changes
-void SetFlagV(byte x, byte y);
-
-//void SetFlagB();
-//May not need since its dependent on the BRK insturction
-
-//void SetFlagD();
-//Might not be necessary.
-
-//void SetFlagI();
-//Need to work on.
-
-void SetFlagZ(int x);
-
-//void SetFlagC();
-//Only 6 instructions, 2 not including stack instructions, use the carry flag.
-
-// The following two may be better defined within apple.c
-
-//byte GetMemory(address x);
-// Retrieve value from the computers address space.
-// It is important not to directly access the memory array because some value hold special meaning.
-
-//void SetMemory(address x, byte y);
-// Set a piece of memory to some value.
+// Memory access declarations; to be defined somewhere computer-specific, not CPU-specific
+byte GetMemory(address x);
+void SetMemory(address x, byte y);
 
+// Stack access and manipulation
 byte GetStack();
-// Get top value of the stack.
-
 void SetStack(byte z);
-// Set top value of the stack.
\ No newline at end of file
-- 
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