Michael Petch
2020-12-17 03:27:54
You will have to set one of the segment registers to 0x0000 and then access the word at offset 044ch through that segment register. Something like this should work:
xor ax, ax ; XOR register with itself same as setting register to 0
mov es, ax ; ES = 0
mov ax, [es:044ch] ; Get size of text video page of current display mode in bytes
; AX now has the 16-bit WORD value at 0000h:044ch
shr ax, 4 ; Divide by 16 to get size in paragraphs
add ax, 0b800h ; Add to the base of text video memory segment to get page 1 segment
; Then you can put AX in a segment like ES to access text video memory
mov es, ax ; ES = segment of page 1 of current text video mode
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