diff --git a/.gitignore b/.gitignore
index 47ba5647f..35411a4a6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,4 +6,6 @@
 */bin/
 */workspace.xml
 ./target/
+target/
 **/.DS_Store
+.project
diff --git a/src/main/fragment/mos6502-common/_deref_(_deref_qbuc1)=_deref_(_deref_qbuc1)_bxor_vbuc2.asm b/src/main/fragment/mos6502-common/_deref_(_deref_qbuc1)=_deref_(_deref_qbuc1)_bxor_vbuc2.asm
new file mode 100644
index 000000000..c41b463f3
--- /dev/null
+++ b/src/main/fragment/mos6502-common/_deref_(_deref_qbuc1)=_deref_(_deref_qbuc1)_bxor_vbuc2.asm
@@ -0,0 +1,8 @@
+ldy {c1}
+sty $fe
+ldy {c1}+1
+sty $ff
+ldy #0
+lda ($fe),y
+eor #{c2}
+sta ($fe),y
\ No newline at end of file
diff --git a/src/main/fragment/mos6502-common/_deref_(deref_qbuz1)=vbuaa.asm b/src/main/fragment/mos6502-common/_deref_(deref_qbuz1)=vbuaa.asm
new file mode 100644
index 000000000..ae531e3d7
--- /dev/null
+++ b/src/main/fragment/mos6502-common/_deref_(deref_qbuz1)=vbuaa.asm
@@ -0,0 +1,3 @@
+lda {z1}
+ldy #0
+sta ({z2}),y
\ No newline at end of file
diff --git a/src/main/fragment/mos6502-common/_deref_pwuc1_eq_vbuc2_then_la1.asm b/src/main/fragment/mos6502-common/_deref_pwuc1_eq_vbuc2_then_la1.asm
new file mode 100644
index 000000000..61aac520f
--- /dev/null
+++ b/src/main/fragment/mos6502-common/_deref_pwuc1_eq_vbuc2_then_la1.asm
@@ -0,0 +1,8 @@
+ldy #1
+lda ({c1}),y
+bne !+
+dey
+lda ({c1}),y
+cmp #{c2}
+beq {la1}
+!:
diff --git a/src/main/fragment/mos6502-common/_deref_pwuc1_neq_vbuc2_then_la1.asm b/src/main/fragment/mos6502-common/_deref_pwuc1_neq_vbuc2_then_la1.asm
new file mode 100644
index 000000000..39af8fb0d
--- /dev/null
+++ b/src/main/fragment/mos6502-common/_deref_pwuc1_neq_vbuc2_then_la1.asm
@@ -0,0 +1,7 @@
+ldy #1
+lda ({c1}),y
+bne {la1}
+dey
+lda ({c1}),y
+cmp #{c2}
+bne {la1}
diff --git a/src/main/fragment/mos6502-common/vbuaa=_deref_(_deref_qbuc1)_bxor_vbuc2.asm b/src/main/fragment/mos6502-common/vbuaa=_deref_(_deref_qbuc1)_bxor_vbuc2.asm
new file mode 100644
index 000000000..43b8fbf89
--- /dev/null
+++ b/src/main/fragment/mos6502-common/vbuaa=_deref_(_deref_qbuc1)_bxor_vbuc2.asm
@@ -0,0 +1,7 @@
+ldy {c1}
+sty $fe
+ldy {c1}+1
+sty $ff
+ldy #0
+lda ($fe),y
+eor #{c2}
diff --git a/src/main/fragment/mos6502-common/vbuaa=_deref_pwuc1_band_vbuc2.asm b/src/main/fragment/mos6502-common/vbuaa=_deref_pwuc1_band_vbuc2.asm
new file mode 100644
index 000000000..bbcc56d74
--- /dev/null
+++ b/src/main/fragment/mos6502-common/vbuaa=_deref_pwuc1_band_vbuc2.asm
@@ -0,0 +1,2 @@
+lda {c1}
+and #{c2}
\ No newline at end of file
diff --git a/src/main/fragment/mos6502-common/vbuz1=_deref_(_deref_qbuc1)_bxor_vbuc2.asm b/src/main/fragment/mos6502-common/vbuz1=_deref_(_deref_qbuc1)_bxor_vbuc2.asm
new file mode 100644
index 000000000..353b52e9c
--- /dev/null
+++ b/src/main/fragment/mos6502-common/vbuz1=_deref_(_deref_qbuc1)_bxor_vbuc2.asm
@@ -0,0 +1,8 @@
+ldy {c1}
+sty $fe
+ldy {c1}+1
+sty $ff
+ldy #0
+lda ($fe),y
+eor #{c2}
+sta {z1}
\ No newline at end of file
diff --git a/src/main/fragment/mos6502-common/vbuz1=_deref_pwuc1_band_vbuc2.asm b/src/main/fragment/mos6502-common/vbuz1=_deref_pwuc1_band_vbuc2.asm
new file mode 100644
index 000000000..d2ab70bf4
--- /dev/null
+++ b/src/main/fragment/mos6502-common/vbuz1=_deref_pwuc1_band_vbuc2.asm
@@ -0,0 +1,3 @@
+lda {c1}
+and #{c2}
+sta {z1}
diff --git a/src/main/kc/include/atari-xl.h b/src/main/kc/include/atari-xl.h
index 29bf0e6b3..2e0ce83d0 100644
--- a/src/main/kc/include/atari-xl.h
+++ b/src/main/kc/include/atari-xl.h
@@ -5,6 +5,30 @@
 #include <atari-gtia.h>
 #include <atari-pokey.h>
 
+// Atari ZP registers
+
+// 1-byte cursor row
+char * ROWCRS = 0x54;
+
+// 2-byte cursor column
+word * COLCRS = 0x55;
+
+// 2-byte saved memory scan counter
+char ** const SAVMSC = 0x58;
+
+// data under cursor
+char * const OLDCHR = 0x5D;
+
+// 2-byte saved cursor memory address
+char ** const OLDADR = 0x5E;
+
+// Cursor inhibit flag, 0 turns on, any other number turns off. Cursor doesn't change until it moves next.
+char * const CRSINH = 0x2F0;
+
+// Internal hardware value for the last key pressed. Set to 0xFF to clear.
+char * const CH = 0x2FC;
+
+
 // Atari GTIA write registers
 struct ATARI_GTIA_WRITE * const GTIA = 0xd000;
 
@@ -40,3 +64,38 @@ char * LPENH = 0x234;
 // OS Shadow ANTIC Light Pen Vertical Position ($D40D)
 char * LPENV = 0x235;
 
+// Color register zero, color of playfield zero. Shadow for 53270 ($D016)
+char * const COLOR0 = 0x2C4;
+
+// Shadow for 53271 ($D017). Text color in Gr.0
+char * const COLOR1 = 0x2C5;
+
+// Shadow for 53272 ($D018). Background color in GR.0
+char * const COLOR2 = 0x2C6;
+
+// Shadow for 53273 ($D019)
+char * const COLOR3 = 0x2C7;
+
+// Shadow for 53274 ($D01A). Border color in GR.0
+char * const COLOR4 = 0x2C8;
+
+// Atari colours - names from Mapping the Atari.
+// Add luminance values 0-14 (even only) to increase brightness
+const char BLACK		= 0x00;
+const char RUST			= 0x10;
+const char RED_ORANGE	= 0x20;
+const char DARK_ORANGE	= 0x30;
+const char RED			= 0x40;
+const char DARK_LAVENDER = 0x50;
+const char COBALT_BLUE	= 0x60;
+const char ULTRAMARINE	= 0x70;
+const char MEDIUM_BLUE	= 0x80;
+const char DARK_BLUE	= 0x90;
+const char BLUE_GREY	= 0xA0;
+const char OLIVE_GREEN	= 0xB0;
+const char MEDIUM_GREEN = 0xC0;
+const char DARK_GREEN	= 0xD0;
+const char ORANGE_GREEN = 0xE0;
+const char ORANGE		= 0xF0;
+
+const char WHITE		= 0xFE;
diff --git a/src/main/kc/lib/conio-atarixl.c b/src/main/kc/lib/conio-atarixl.c
new file mode 100644
index 000000000..26405711a
--- /dev/null
+++ b/src/main/kc/lib/conio-atarixl.c
@@ -0,0 +1,239 @@
+// Atari XL conio.h implementation
+#include <string.h>
+#include <conio.h>
+#include <atari-xl.h>
+
+// The screen width
+#define CONIO_WIDTH 40
+// The screen height
+#define CONIO_HEIGHT 24
+
+// The current reverse value indicator. Values 0 or 0x80 for reverse text
+__ma char conio_reverse_value = 0;
+
+// The current cursor enable flag. 1 = on, 0 = off.
+__ma char conio_display_cursor = 1;
+
+// The current scroll enable flag. 1 = on, 0 = off.
+__ma char conio_scroll_enable = 1;
+
+// Move cursor and output one character
+// Same as "gotoxy (x, y); cputc (c);"
+void cputcxy(unsigned char x, unsigned char y, char c) {
+	gotoxy(x, y);
+	cputc(c);
+}
+
+// Output one character at the current cursor position
+// Moves the cursor forward. Scrolls the entire screen if needed
+void cputc(char c) {
+	char screenCode;
+	if (c == '\r') { // 0x0d, CR = just set the cursor x value to 0
+		*COLCRS = 0;
+		setcursor();
+	} else if(c == '\n' || c == 0x9b) { // 0x0a LF, or atascii EOL
+		*COLCRS = 0;
+		newline();
+	} else {
+		putchar(convertToScreenCode(&c));
+		(*COLCRS)++;
+		if (*COLCRS == CONIO_WIDTH) {
+			*COLCRS = 0;
+			newline();
+		} else {
+			setcursor();
+		}
+	}
+}
+
+// Puts a character to the screen a the current location. Uses internal screencode. Deals with storing the old cursor value
+void putchar(unsigned char code) {
+	**OLDADR = *OLDCHR;
+	char * loc = cursorLocation();
+	char newChar = code | conio_reverse_value;
+	*loc = newChar;
+	*OLDCHR = newChar;
+	setcursor();
+}
+
+// Output a NUL-terminated string at the current cursor position
+void cputs(const char* s) {
+	char c;
+	while (c = *s++) {
+		cputc(c);
+	}
+}
+
+// Move cursor and output a NUL-terminated string
+// Same as "gotoxy (x, y); puts (s);"
+void cputsxy(unsigned char x, unsigned char y, const char* s) {
+    gotoxy(x, y);
+    cputs(s);
+}
+
+// Return a pointer to the location of the cursor
+char * cursorLocation() {
+	return *SAVMSC + (word)(*ROWCRS)*CONIO_WIDTH + *COLCRS;
+}
+
+void newline() {
+	if ((*ROWCRS)++ == CONIO_HEIGHT) {
+		if (conio_scroll_enable == 1) {
+			// first hide the current screen cursor, so it doesn't scroll, but only if it is on
+			if (conio_display_cursor == 1) {
+				**OLDADR ^= 0x80;
+			}
+			// move screen up 1 line
+			char * start = *SAVMSC;
+			memcpy(start, start + CONIO_WIDTH, CONIO_WIDTH * 23);
+			memset(start + CONIO_WIDTH * 23, 0x00, CONIO_WIDTH);
+			*ROWCRS = CONIO_HEIGHT - 1;
+		} else {
+			gotoxy(0, 0);
+		}
+	}
+	setcursor();
+}
+
+// Handles cursor movement, displaying it if required, and inverting character it is over if there is one (and enabled)
+void setcursor() {
+	// save the current oldchr into oldadr
+	**OLDADR = *OLDCHR;
+	// work out the new location for oldadr based on new column/row
+	char * loc = cursorLocation();
+	char c = *loc;
+	*OLDCHR = c;
+	*OLDADR = loc;
+	if (conio_display_cursor == 0) {
+		// cursor is off, don't affect the character at all, but do turn off cursor
+		*CRSINH = 1;
+	} else {
+		// cursor is on, so invert the inverse bit and turn cursor on
+		*CRSINH = 0;
+		c = c ^ 0x80;
+	}
+	**OLDADR = c;
+}
+
+// Print a newline
+void cputln() {
+	*COLCRS = 0;
+	newline();
+}
+
+// Set the cursor to the specified position
+void gotoxy(unsigned char x, unsigned char y) {
+	*COLCRS = x;
+	*ROWCRS = y;
+	setcursor();
+}
+
+// Sets reverse mode for text. 1 enables reverse, 0 disables. Returns the old value.
+unsigned char revers(unsigned char onoff) {
+	char old = conio_reverse_value;
+	if (onoff == 0) conio_reverse_value = 0; else conio_reverse_value = 0x80;
+	return old;
+}
+
+// If onoff is 1, scrolling is enabled when outputting past the end of the screen
+// If onoff is 0, scrolling is disabled and the cursor instead moves to (0,0)
+// The function returns the old scroll setting.
+unsigned char scroll(unsigned char onoff) {
+	char old = conio_scroll_enable;
+	conio_scroll_enable = onoff;
+	return old;
+}
+
+// clears the screen and moves the cursor to the upper left-hand corner of the screen.
+void clrscr() {
+	// Fill entire screen with spaces
+	memset(*SAVMSC, 0x00, CONIO_WIDTH * CONIO_HEIGHT); // 0x00 is screencode for space character
+	// set the old character to a space so the cursor doesn't reappear at the last position it was at
+	*OLDCHR = 0x00;
+	gotoxy(0,0);
+}
+
+// If onoff is 1, a cursor is displayed when any text is output.
+// If onoff is 0, the cursor is hidden instead.
+unsigned char cursor(unsigned char onoff) {
+	// this just updates internal cursor flag value, doesn't update CRSINH
+	// onoff: 0 => cursor off, 1 => cursor on
+	// CRSINH is opposite to this, 0 == ON, 1 == OFF
+	char oldValue = conio_display_cursor;
+	conio_display_cursor = onoff;
+	return oldValue;
+}
+
+// Return the X position of the cursor
+unsigned char wherex() {
+	return (*COLCRS & 0xff);
+}
+
+// Return the Y position of the cursor
+unsigned char wherey() {
+	return *ROWCRS;
+}
+
+// Return the current screen size.
+void screensize(unsigned char *x, unsigned char *y) {
+	*x = CONIO_WIDTH;
+	*y = CONIO_HEIGHT;
+}
+
+// Return the current screen size X width.
+char screensizex() {
+	return CONIO_WIDTH;
+}
+
+// Return the current screen size Y height.
+char screensizey() {
+	return CONIO_HEIGHT;
+}
+
+// Return 1 if there's a key waiting, return 0 if not
+unsigned char kbhit() {
+	if (*CH == 0xff) return 0; else return 1;
+}
+
+// Clears the key waiting buffer.
+inline void clrkb() {
+	*CH = 0xff;
+}
+
+// Set the color for the text. The old color setting is returned.
+unsigned char textcolor(unsigned char color) {
+    char old = *COLOR1;
+    *COLOR1 = color;
+    return old;
+}
+
+// Set the color for the background. The old color setting is returned.
+unsigned char bgcolor(unsigned char color) {
+    char old = *COLOR2;
+    *COLOR2 = color;
+    return old;
+}
+
+// Set the color for the border. The old color setting is returned.
+unsigned char bordercolor(unsigned char color) {
+    char old = *COLOR4;
+    *COLOR4 = color;
+    return old;
+}
+
+// Convert an atascii character to its screen code representation. Requires 1 page lookup table generated below.
+inline unsigned char convertToScreenCode(unsigned char* v) {
+	return rawmap[*v];
+}
+
+// create a static table to map char value to screen value
+// use KickAsm functions to create a table of code -> screen code values, using cc65 algorithm
+char rawmap[0x100] = kickasm {{
+	.var ht = Hashtable().put(0,64, 1,0, 2,32, 3,96) // the table for converting bit 6,7 into ora value
+	.for(var i=0; i<256; i++) {
+		.var idx = (i & $60) / 32
+		.var mask = i & $9f
+		.byte mask | ht.get(idx)
+	}
+}};
+
diff --git a/src/main/kc/lib/conio-cbm-shared.c b/src/main/kc/lib/conio-cbm-shared.c
index 71537ddf8..9b74bd8b3 100644
--- a/src/main/kc/lib/conio-cbm-shared.c
+++ b/src/main/kc/lib/conio-cbm-shared.c
@@ -160,7 +160,7 @@ unsigned char cursor(unsigned char onoff) {
 }
 
 // If onoff is 1, scrolling is enabled when outputting past the end of the screen
-// If onoff is 1, scrolling is disabled and the cursor instead moves to (0,0)
+// If onoff is 0, scrolling is disabled and the cursor instead moves to (0,0)
 // The function returns the old scroll setting.
 unsigned char scroll(unsigned char onoff) {
     char old = conio_scroll_enable;
diff --git a/src/main/kc/lib/conio.c b/src/main/kc/lib/conio.c
index d151c7a5f..ef8c09ad1 100644
--- a/src/main/kc/lib/conio.c
+++ b/src/main/kc/lib/conio.c
@@ -15,6 +15,8 @@
 #include "conio-mega65.c"
 #elif defined(__NES__)
 #include "conio-nes.c"
+#elif defined(__ATARIXL__)
+#include "conio-atarixl.c"
 #else
 #error "Target platform does not support conio.h"
 #endif