I am setting up a database in Access for eventual use in a VB6 program (if I ever get that far).
My problem is as follows;
In aviation, aircraft are assigned a 4 digit code (Transponder Code), using an octal system, that is to say only the numbers 0 thru 7 are useable, so that the numbering could follow the following sequence;
This code is issued as an exclusive code (within a specified geographical area) that Air Traffic Control use to identify an aircraft on Radar Displays.
MY QUESTION IS;
How can I create a mask (in Access and later in VB6) to permit only the input of "allowed" codes?
There are some other related questions in this regard that I will post as I get to that stage.
Thank you in advance