From 19e3bbbea31b6ce1bf3b319a70f204fe0b1a3806 Mon Sep 17 00:00:00 2001
From: Steven Hugg <hugg@fasterlight.com>
Date: Tue, 14 Nov 2023 10:52:33 -0600
Subject: [PATCH] c64: updated examples

---
 presets/c64/helloc.c     | 16 ++++++++++++++++
 presets/c64/screen_ram.c | 29 +++++++++++++++++++++++++++++
 src/platform/c64.ts      | 12 +++++++-----
 3 files changed, 52 insertions(+), 5 deletions(-)
 create mode 100644 presets/c64/helloc.c
 create mode 100644 presets/c64/screen_ram.c

diff --git a/presets/c64/helloc.c b/presets/c64/helloc.c
new file mode 100644
index 00000000..e0817d9c
--- /dev/null
+++ b/presets/c64/helloc.c
@@ -0,0 +1,16 @@
+
+#include <stdio.h>
+#include <conio.h>
+#include <c64.h>
+#include <cbm_petscii_charmap.h>
+
+void main(void) {
+  clrscr();			// clear screen
+  puts("Hello World!\n");	// write message at cursor
+  chline(12);			// horizontal line
+  bordercolor(COLOR_LIGHTBLUE);	// set color to blue
+  bgcolor(COLOR_GREEN);		// set background color
+  textcolor(COLOR_YELLOW);	// set text color
+  puts("\nThis text is yellow!\n"); // write message
+  cgetc();			// wait for input
+}
diff --git a/presets/c64/screen_ram.c b/presets/c64/screen_ram.c
new file mode 100644
index 00000000..1b3aa4aa
--- /dev/null
+++ b/presets/c64/screen_ram.c
@@ -0,0 +1,29 @@
+
+#include "common.h"
+//#link "common.c"
+ 
+#include <cbm_screen_charmap.h>
+
+void main(void) {
+  unsigned int i;
+  
+  clrscr();          // clear the screen
+  
+  POKE(0x400, 'A');  // write to first byte of screen memory
+  POKE(0x400, 65);   // character code for 'A'
+  POKE(0x400 + 40*24 + 39, 'Z');   // row 24, column 39
+  
+  // fill with random characters
+  for (i=0; i<40*25; i++)
+    POKE(0x400 + i, 205 + (rand() & 1));
+
+  // set character set to uppercase + graphics characters
+  SET_VIC_BITMAP(0x1000);
+
+  // set color map underlying characters
+  for (i=0; i<40*25; i++)
+    COLOR_RAM[i] = COLOR_GREEN;
+
+  // infinite loop (avoid "ready" prompt)
+  while (1);
+}
diff --git a/src/platform/c64.ts b/src/platform/c64.ts
index 0274d245..4e8481be 100644
--- a/src/platform/c64.ts
+++ b/src/platform/c64.ts
@@ -5,11 +5,8 @@ import { PLATFORMS } from "../common/emu";
 import { BaseMAME6502Platform } from "../common/mameplatform";
 
 const C64_PRESETS = [
-  {id:'hello.dasm', name:'Hello World (ASM)'},
-  {id:'23matches.c', name:'23 Matches'},
-  {id:'tgidemo.c', name:'TGI Graphics Demo'},
-  {id:'upandaway.c', name:'Up, Up and Away'},
-  {id:'siegegame.c', name:'Siege Game'},
+  {id:'helloc.c', name:'Hello World'},
+  {id:'screen_ram.c', name:'Screen RAM'},
   {id:'joymove.c', name:'Sprite Movement'},
   {id:'sprite_collision.c', name:'Sprite Collision'},
   {id:'scroll1.c', name:'Scrolling (Single Buffer)'},
@@ -34,6 +31,11 @@ const C64_PRESETS = [
   {id:'test_border_sprites.c', name:'Sprites in the Borders'},
   {id:'sprite_stretch.c', name:'Sprite Stretching'},
   {id:'plasma.c', name:'Plasma Demo'},
+  {id:'siegegame.c', name:'Siege Game'},
+  {id:'23matches.c', name:'23 Matches'},
+  {id:'tgidemo.c', name:'TGI Graphics Demo'},
+  {id:'upandaway.c', name:'Up, Up and Away'},
+  {id:'hello.dasm', name:'Hello World (DASM)'},
   {id:'hello.wiz', name:'Hello Wiz (Wiz)'},
 ];