72 lines
1.2 KiB
C
72 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <time.h>
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#include "6502.h"
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#include "6850.h"
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struct termios oldTermios;
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void step_delay()
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{
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struct timespec req, rem;
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req.tv_sec = 0;
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req.tv_nsec = STEP_DURATION;
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nanosleep(&req, &rem);
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}
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void run_cpu()
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{
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for (;;) {
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// CPU timing is currently very far from being cycle-accurate
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for (int i = 0; i < (CPU_FREQ / (ONE_SECOND / STEP_DURATION)); i++) {
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step_cpu();
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step_uart();
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}
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step_delay(); // remove this for more speed
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}
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}
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void restore_stdin()
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{
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tcsetattr(0, TCSANOW, &oldTermios);
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}
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void raw_stdin()
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{
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struct termios newTermios;
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tcgetattr(0, &oldTermios);
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newTermios = oldTermios;
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cfmakeraw(&newTermios);
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tcsetattr(0, TCSANOW, &newTermios);
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atexit(restore_stdin);
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}
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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printf("Usage: %s file.rom\n", argv[0]);
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printf("The first 16k of \"file.rom\" is loaded into the last 16k of memory.\n");
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return EXIT_FAILURE;
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}
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if (load_rom(argv[1]) != 0) {
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printf("Error loading \"%s\".\n", argv[1]);
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return EXIT_FAILURE;
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}
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raw_stdin(); // allow individual keystrokes to be detected
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init_tables();
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init_uart();
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reset_cpu();
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run_cpu();
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return EXIT_SUCCESS;
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}
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