; extended precision division from section 9.3.5
; of Randall Hyde’s “Art of Assembly”
; start: DX=dividend MSW, AX=dividend LSW, BX=divisor
; before div: DX=0, AX=dividend MSW, BX=divisor
; after div: AX=quotient MSW, DX=intermediate remainder
; before div: DX=intermediate remainder, AX=dividend LSW, BX=divisor
; after div: AX=quotient LSW, DX=remainder
; end: DX=quotient MSW, AX=quotient LSW, CX=remainder
hi, first of all, the code snippet you have given is doing only the printing the 32-bit number in a specified radix. its not part of any memory detection routine. i think you havent’t completely gone through the comments given along with the code.
its just dividing the number with the radix, each time getting the least significant number, converting to printable ascii format in the range ’0′ – ’9′ and ‘A’ – ‘Z’ (though not limited to ‘Z’), storing the result in the reverse order starting from the address num_buf(you can notice a 40 bytes array declared just above the address) and after the conversion is over cputs is called to print the formed string.