From 0ba0d793ca60189fa8378399d32d6299a1dd9db5 Mon Sep 17 00:00:00 2001
From: alekseiplusplus <alekseijeaves@protonmail.com>
Date: Fri, 1 Dec 2023 20:12:52 +1100
Subject: fixed CR with terminal & VRAM

---
 src/apple.c            |  2 +-
 src/cpu/instructions.c |  5 ++---
 src/video/ncurses.c    | 54 +++++++++++++++++++++++++++++++-------------------
 3 files changed, 37 insertions(+), 24 deletions(-)

(limited to 'src')

diff --git a/src/apple.c b/src/apple.c
index ba2cfb6..18f1763 100644
--- a/src/apple.c
+++ b/src/apple.c
@@ -104,7 +104,7 @@ void SetMemory(address x, byte y){
 byte UserInput()
 {
 	#ifdef GRAPHICAL
-
+	// SDL code
 	#else
 	int c = getch();
 	#endif
diff --git a/src/cpu/instructions.c b/src/cpu/instructions.c
index cb80855..da093ec 100644
--- a/src/cpu/instructions.c
+++ b/src/cpu/instructions.c
@@ -44,7 +44,7 @@ void fSTY(Addressing addr, address val){
 // Arithmetic Instructions
 
 void fADC(Addressing addr, address val){
-	int buffer = acc + idata.value;
+	int buffer = (int)acc + idata.value;
 	SetFlagV(buffer, acc);
 
 	if (buffer > 255)
@@ -139,8 +139,7 @@ void fJMP(Addressing addr, address val){
 	PC = val; PC -= 2;
 }
 
-void fBCC(Addressing addr, address val){	//FINISH ALL BRANCH INSTRUCTIONS
-	//signed char val down to BVC
+void fBCC(Addressing addr, address val){
 	if (getFlag(flag_C) == 0) PC += (char)val;
 }
 
diff --git a/src/video/ncurses.c b/src/video/ncurses.c
index c7cf3fb..242a3e1 100644
--- a/src/video/ncurses.c
+++ b/src/video/ncurses.c
@@ -105,31 +105,45 @@ void DisplayInput(byte n)
 		return;
 	}
 
-	n &= 0b01111111;
-	
-	// Place character
+	// Clear @
     mvwaddch(AppleWindow, TermY, TermX, ' ');
-    mvwaddch(AppleWindow, TermY, TermX, n);
+
+	if (n == CR) {
+		// Add spacing characters into VRAM
+		do {
+			*VRAM_Position = ' ';
+			VRAM_Position++;
+		} while (((int)(VRAM_Position - VRAM) % 40) > 0);
+
+		// Set display to next line
+		TermX = 0;
+		TermY++;
+	}
+	else {
+		// Place character
+		mvwaddch(AppleWindow, TermY, TermX, n & 0x7F);
 	
-	// Add character to register
-    *VRAM_Position = n;
-    VRAM_Position++;
-    if (VRAM_Position >= (VRAM + 960))
-        VRAM_Position = VRAM;
-    
-    TermX++;
-	// If X is past width..
-    if (TermX >= 40) {
-		//.. move to start of next line.
-        TermX = 0;
-        TermY++;
-    }
+		// Add character to VRAM
+		*VRAM_Position = n & 0x7f;
+		VRAM_Position++;
+
+		// Set display to next character/next line
+		TermX++;
+		if (TermX >= 40) {
+			TermX = 0;
+			TermY++;
+		}
+	}
 
+	// Reset VRAM_Position if it's value is too great.
+	if (VRAM_Position >= (VRAM + 960))
+        VRAM_Position -= 960;
+    
 	// If Y is past height..
     if (TermY >= 24) {
+		
 		//.. discard the first line..
 		VRAM_Offset += 40;
-
 		//.. verify the register offset..
 		if (VRAM_Offset >= 960)
             VRAM_Offset = VRAM;
@@ -141,7 +155,7 @@ void DisplayInput(byte n)
         for (int i = 0; i < 23; i++) {
         for (int j = 0; j < 40; j++) {
             if (offset >= (VRAM + 960))
-                offset -= VRAM;
+                offset -= 960;
             mvwaddch(AppleWindow, i, j, *offset );
             offset++;
         }}
@@ -153,7 +167,7 @@ void DisplayInput(byte n)
 			"                                        ");
     }
 
-	// @ prompt.
+	// Place @
     mvwaddch(AppleWindow, TermY, TermX, '@' | A_BLINK);
     wrefresh(AppleWindow);
 }
-- 
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