Alright I am currently writing a program to make a calendar as a project, to which using the ascii table to make borders and the such. So now I have a month completed, now I need to make a keyboard input to shift between a month foward and a month backwards. Like when the program loads it will show a calendar for the month of november, pressing a key and going back to the month of october, pressing the next key and going back to november then next again to december ect ect.

My problem is though I have no clue how to save a page(or calender month in this program) into memory and have it available for me to cycle between.

So lets take an easy program,

.model small
.stack 200h
.386
cseg segment 'code'
assume cs:cseg, ds:cseg
start:
mov ah,0
int 10h
mov ES,0B800h
mov ES,AX
mov byte ptr ES:[2], 'B'

mov ah,4ch
int 21h
cseg ends
end start

That will display the letter B op the top left hand corner of the screen in row 2, now how would I save that into memory and then make another page with say the letter P on it. This is all in 16-bit and only in 16-bit. We have learned about int 10h marginally, just that we were supposed to use that at the start and the textbook itself is absolutely no help(as there was no book required for the course but I went and picked one up which turned to be only marginally helpful). I hope you understand what I am trying to say and thanks in advance for any help that you might provide. If you need anymore information b4 you can help me feel free to ask.