Messages in a buffer (MESSAGE1, MESSAGE2)

These buffers all contain a message that is to be output for the IEDTCMD function.

They have the following format: 2 bytes for the length of MESSAGE (total length including that of the length field and the unused field), 2 bytes unused, n bytes record content.

The length field must contain the length in bytes. However, a maximum of 132 or 80 characters are displayed (depending on the current line length of the screen).

This is now only unsatisfactorily reproduced by the Equate EUPMSGM function which is now only supported for reasons of compatibility.