prom_putchar
prom_putchar(*buf++);
prom_putchar(c);
prom_putchar('\b');
prom_putchar(' ');
prom_putchar(c);
prom_putchar('\r');
prom_putchar('\n');
prom_putchar('\a'); /* bell */
prom_putchar('\r');
prom_putchar('\n');
prom_putchar('\a'); /* bell */
prom_putchar(c);
prom_putchar('\b');
prom_putchar(' ');
prom_putchar(c);
prom_putchar('\r');
prom_putchar(c);
(void) prom_putchar(c);
prom_putchar(c);
prom_putchar(*s++);
extern void prom_putchar(char c);
extern void prom_putchar(char c);