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You can convert single digits from ASCII to number by simply subtracting '0'. To convert a multiple digit number, I guess you could count the number of digits and and multiply each digit by a power of ten corresponding to its position and sum all these to get the final number. But I'm wondering if there is any compact way to do this in x86-16 assembly.

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    Use a loop to implement tmp = 0; for() { tmp = tmp*10 + (*digits++)-'0'; } in asm however you like, with appropriate loop boundaries. i.e. the usual atoi algorithm. If you can use 32-bit addressing modes, you can multiply by 10 + add in 2 LEA instructions. Commented Mar 29, 2018 at 2:20
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    Thanks man! I wrote a simple atoi algorithm based on what you said, and it works nicely. Commented Mar 29, 2018 at 10:20
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