* ======================================================== * * Thomas C. Penick ID# 452 80 6040 Program 3 * * EE319K Microprocessor Programming due 2/20/98 * * Instructor: Laurence Section B * * MC6811 Program Source Code PA3.asm Roster# * * How to Hand Assemble Source Code * * ======================================================== * org $E000 ; start of ROM Main lds #$00FF ; initialize the stack pointer ldx First ; place first no. in X ldy Second ; place second number in Y bsr Max ; call Max for largest stop bra Main First fdb 5 ; first number Second fdb 9 ; second number Max pshy ; put Y on the stack pshx ; put X on the stack tsx ; get the stack pointer cpy 0,X ; compare the nos, (Y-stack) bgt Mout ; Is second largest? ldd 0,X ; put the first in D bra Mdone Mout xgdy ; put second number in D Mdone pulx ; restore X puly ; restore Y rts ; return outmsg fcb CR fcc "Largest Is:" fcb EOT org $FFFE fdb Main end