1. How do you check for keypresses?

2. How do you set console cursor postion?

3. How do you empty the screen to blank?

well, there are may ways to do the following, so i'll give you some simple ways:

1. keypresses:

mov ah,1
int 16
jz nokeypress
handlekeypress:


2. setcursor:
INT 10 - VIDEO - SET CURSOR POSITION
AH = 02h
BH = page number
0-3 in modes 2&3
0-7 in modes 0&1
0 in graphics modes
DH = row (00h is top)
DL = column (00h is left)
Return: nothing

3. clearscreen:

INT 10 - VIDEO - SCROLL UP WINDOW
AH = 06h
AL = number of lines by which to scroll up (00h = clear entire window)
BH = attribute used to write blank lines at bottom of window
CH,CL = row,column of window's upper left corner
DH,DL = row,column of window's lower right corner
Return: nothing
Note: affects only the currently active page (see AH=05h)
BUGS: some implementations (including the original IBM PC) have a bug which
destroys BP

or, you can just write 00's to the video buffer.