8051 assember help

hi

i have this assignment that i have to do and what i need to do is create a 8051 assembler program
basicly convert binary to show decimal numbers on a 7 segment display
the binary numbers are input using switches on a project board and i need to program a ats8something

all i want to know is the steps i need to do to make this happen i probaly be able to program it
something like a flowchart would be helpful

thanks

Strip the high bits
set base pointer (dptr) to beginning of table
retrieve segment map from table location @(a+dptr)
write to display
return