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9216057db8
I implement the screen using XCB which is much more friendly than z80e's SDL+CMake for development machines that want to install minimal dependencies (for example, a port-less OpenBSD rig).
127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
/* RC2014 classic
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*
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* - 8K of ROM in range 0x0000-0x2000
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* - 32K of RAM in range 0x8000-0xffff
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* - ACIA in ports 0x80 (ctl) and 0x81 (data)
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*
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* ACIA is hooked to stdin/stdout. CTRL+D exits when in TTY mode.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <termios.h>
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#include "../../emul.h"
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#include "acia.h"
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#define RAMSTART 0x8000
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#define ACIA_CTL_PORT 0x80
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#define ACIA_DATA_PORT 0x81
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#define MAX_ROMSIZE 0x2000
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static ACIA acia;
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static uint8_t iord_acia_ctl()
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{
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return acia_ctl_rd(&acia);
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}
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static uint8_t iord_acia_data()
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{
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return acia_data_rd(&acia);
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}
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static void iowr_acia_ctl(uint8_t val)
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{
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acia_ctl_wr(&acia, val);
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}
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static void iowr_acia_data(uint8_t val)
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{
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acia_data_wr(&acia, val);
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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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fprintf(stderr, "Usage: ./classic /path/to/rom\n");
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return 1;
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}
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FILE *fp = fopen(argv[1], "r");
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if (fp == NULL) {
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fprintf(stderr, "Can't open %s\n", argv[1]);
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return 1;
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}
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Machine *m = emul_init();
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m->ramstart = RAMSTART;
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int i = 0;
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int c;
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while ((c = fgetc(fp)) != EOF && i < MAX_ROMSIZE) {
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m->mem[i++] = c & 0xff;
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}
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pclose(fp);
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if (i == MAX_ROMSIZE) {
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fprintf(stderr, "ROM image too large.\n");
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return 1;
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}
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bool tty = isatty(fileno(stdin));
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struct termios term, saved_term;
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if (tty) {
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// Turn echo off: the shell takes care of its own echoing.
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if (tcgetattr(0, &term) == -1) {
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printf("Can't setup terminal.\n");
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return 1;
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}
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saved_term = term;
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term.c_lflag &= ~ECHO;
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term.c_lflag &= ~ICANON;
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term.c_cc[VMIN] = 0;
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term.c_cc[VTIME] = 0;
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tcsetattr(0, TCSADRAIN, &term);
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}
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acia_init(&acia);
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m->iord[ACIA_CTL_PORT] = iord_acia_ctl;
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m->iord[ACIA_DATA_PORT] = iord_acia_data;
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m->iowr[ACIA_CTL_PORT] = iowr_acia_ctl;
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m->iowr[ACIA_DATA_PORT] = iowr_acia_data;
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char tosend = 0;
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while (emul_step()) {
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// Do we have an interrupt?
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if (acia_has_irq(&acia)) {
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Z80INT(&m->cpu, 0);
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}
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// Is the RC2014 transmitting?
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if (acia_hastx(&acia)) {
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putchar(acia_read(&acia));
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fflush(stdout);
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}
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// Do we have something to send?
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if (!tosend) {
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char c;
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if (read(fileno(stdin), &c, 1) == 1) {
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if (c == 4) { // CTRL+D
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// Stop here
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break;
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}
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tosend = c;
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} else if (!tty) {
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// This means we reached EOF
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break;
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}
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}
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if (tosend && !acia_hasrx(&acia)) {
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acia_write(&acia, tosend);
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tosend = 0;
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}
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}
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if (tty) {
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printf("Done!\n");
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tcsetattr(0, TCSADRAIN, &saved_term);
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emul_printdebug();
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}
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return 0;
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}
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