Mr. J. Addey has sent us a useful subroutine which prints HL in decimal. We have modified it for Nascom/​Nas-Sys, and have also saved quite a few bytes by tidying it up and converting to full use of the Z80. Here it is complete with a little program which demonstrates the use of several Nas-Sys routines. Run the program at 0D00H and type in a value in HEXadecimal. Errors are trapped. This program is a good starting point for beginners to analyse.