.define Sbi4 .sect .text .sect .rom .sect .data .sect .bss .sect .text ! This subroutine subtracts two fourbyte signed integers. Sbi4: jsr Addsub ! initiate addresses sec 1: lda (ADDR+2),y ! get lowbyte+y first operand sbc (ADDR),y ! subtract lowbyte+y second operand sta (ADDR+2),y ! put on stack lowbyte+y result iny inx bne 1b rts