dectech.c

#include <stdio.h>

/* Print out a table of the DEC Technical Character Set for the VT340, 420, etc */
/* hackerb9 2022 */

int main() {
  int c;
  char *scs="\e+>";		/* Set dec-tech charset to G3 */
  char *ss3="\eO";		/* Single (non-locking) shift to G3 */

  printf(scs);

  printf ("DEC Technical Character Set\n\n");
  printf("     ");
  for (int i=2; i<=7; i++) { printf (" %X_", i); }
  printf("\n");
  printf("\n");

  for (int v=0; v<=0xF; v++) {
    printf ("  _%X ", v);
    for (int u=2; u<=7; u++) {
      c=u*16+v;			/* ASCII character 0xuv */
      switch(c) {
      case 0x20:  case 0x38:  case 0x39:  case 0x3A:  case 0x3B:  case 0x52:  
      case 0x54:  case 0x55:  case 0x6D:  case 0x75:  case 0x7F:
	printf("   ");		/* Skip characters "Reserved for future use" */
	break;

      default:
	printf(" %s%c ", ss3, c);
	break;
      }
    }
    printf("\n");
  }
  printf("\n");


  return 0;
}