A9h ER$PRNT print a string formatted as error message
Input X register - Address of leading byte count string.
Output - none -
Description

Prints the string at X in the same format as an error message.

The string to be printed must be <= 20 characters for 4-line mode and <= 16 characters if it is to be used in 2-line mode.

This call is not available on CM/XP machines.

Example Prints the string "BAD PASSWORD" in the same format as an operating system error message.
        LDX     #BAD_PASS       ;point to string
        OS      ER$PRNT
        RTS

BAD_PASS:
        ASCIC   "BAD PASSWORD"

Errors - none -