mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-17 15:06:29 +00:00
66 lines
1.6 KiB
Plaintext
66 lines
1.6 KiB
Plaintext
/* Atari VCS Color Bars Program */
|
|
|
|
#pragma origin $F800 //4k Cartridge
|
|
#include <vcshead.h02> //TIA and RIOT Registers
|
|
#include <vcsstub.h02> //Initialize VCS
|
|
#include <vcslib.h02> //VCS Library Routines
|
|
#include <score2.h02> //Two Player Score Kernel
|
|
|
|
zeropage char clrbkg; //Background Color
|
|
zeropage char clrmov; //Color Movement Flag
|
|
zeropage char clrofs; //Color Offset
|
|
zeropage char clrmsk; //Color/B&W Mask
|
|
zeropage char cntdwn; //Timer Countdown
|
|
|
|
char colors = {$86, $C6, $46, $00, $0E, $06, $0A, $00}; //Color Table
|
|
|
|
/* Setup Code */
|
|
void setup() {
|
|
}
|
|
|
|
/* Vertical Blank Code */
|
|
void vrtblk() {
|
|
setclr(&colors); //Set Color Table
|
|
scrprp(); //Prepare Score for Display
|
|
}
|
|
|
|
/* Execute Kernel Code */
|
|
void kernel() {
|
|
CTRLPF = 2; //Set Score Mode
|
|
scrdsp(); //Display Scores (12 Scanlines)
|
|
|
|
X=180; //Draw 180 Scanlines
|
|
do {
|
|
clrbkg = X;
|
|
if (!SWCHB & 128) clrbkg<<;
|
|
A = clrbkg + clrofs & clrmsk; //Set Background Color
|
|
WSYNC = A; //Wait for end of Scanline
|
|
COLUBK = A; //Set Background Color
|
|
X--;
|
|
} while (X);
|
|
return;
|
|
}
|
|
|
|
/* Execute Overscan Code */
|
|
void ovrscn() {
|
|
if (!SWCHB & 1) //Game Reset
|
|
clrmov = $FF; //Turn On Scrolling
|
|
if (!SWCHB & 2) //Game Select
|
|
clrmov = 0; //Turn Off Scrolling
|
|
clrmsk = (SWCHB & 8) ? $FF : $0F;
|
|
if (clrmov) {
|
|
if (SWCHB & 64) clrofs--; else clrofs++;
|
|
}
|
|
cntdwn++;
|
|
if (cntdwn == 10) {
|
|
cntdwn = 0;
|
|
addbcd(1,&score2); //Increment Player 2 Score
|
|
if (!score2) addbcd(1, &score1); //Increment Player 1 Score
|
|
}
|
|
}
|
|
|
|
#include <digits.h02> //Digit Graphics
|
|
#include <vcsfoot.h02> //Finalization Code
|
|
|
|
|