assembly - How to convert ascii number to binary in MC68k -

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i have write program requires 20 user inputted numbers 0-100 find average of numbers , categorize them failing or passing saves input ascii in memory , have change ascii binary. know ascii numbers 30-39 in hex unsure how implement in mc68k if input 93 number saved 3933 how convert binary?

  clear number loop:   highest digit character not dealt yet   compare digit character '0' ; that's character 0, not value 0   blo done   compare digit character '9'   bhi done   multiply number 0x0a ; 10 in decimal   subtract 0x30 character   add number   jmp loop cone:   ...

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