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Days in a month - embedded system - smaller than table.

A small routine returning the number of days in a month for those rolling their own.

(8086 assembly)

//ah = month. 0 = Jan, 7 = Aug..etc. Feb not handled
//ah destroyed.
//al contains number of days in month
mov al,31
xor ah,9
jp thirty_one //parity bit set on 30 day months
dec al
:thirty_one
ret
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