Program for XTR modem

Greetings. you CODERS. We need a lot of help in writing programs for XTR modem, but the essence of the program is that it performed the MOVE function, and the current conditions were: Standard entry points into TR-DOS In this case, one page was used RAM that is 16kB The full disk directory is already loaded and under it is not necessary to allocate ALL places for it perform disk operations with a point input 3D13 -+- 4.5 IS-DOS glitches