I apologize to PCL Works. When presented with the complete font select string
as per Chris H, the bbox displays correctly using PCL Works. It still, however does
NOT display correctly with either of my pdf converters.
Modified C code is below.
#include <stdio.h>
int main()
{
printf("%c(579L%c(s1p24v0s0b31402T%c*p500x500Y%c",27,27,27,254);
}