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- ; To become familiar with the segment feature you
- ; should assemble this file with and without the
- ; single object module swicth enabled.
- ;
- ; a68 -o example ;three object module files
- ; code.seg
- ; memory.seg
- ; rom2.seg
- ;
- ; a68 example ;one object module file example.obj
-
-
- .db h'00,o'77,h'77,d'77,77,077
- .org h'20 ;start assembly at location 20 hex.
- .segment .memory ;declare a new segmemt for ram memory
- ;allocation
- .memory ;select segment .memory as active(locaton counter)
- ;for the .code segment(created by the assembler) is
- ;saved for when we switch back.
- .org h'8000 ;Ram starts at 8000 hex.
- var1: .rs 1 ;variable 1
- var16: .rs 2 ;16 bit variable
- array: .rs 100*2 ;100 16 bit word array
- .eject ;lets start on a fresh page of paper.
- ;notice that an page eject does not print!
- ;test list off
- .command -l ;this should not print
- .db "this is a .db test (fcc on some oem assemblers)"
- .command +l ;this also should not print
- ;this line should print
- .code ;switch back to code segment
- ; origin is where we left off.
- loop: .dw loop,loop2
- .drw loop,loop2
- .equ cr,13 ;equated idienifiers are constant.
- .equ htab,9
- .set temp,23 ;set identifiers may be re-set.
- .set temp,24
- .set temp,25
- .db 1,2,3,4,5,'p'
- .db 6,7,"this is a test\r\n\0"
- .dw 1,h'1234
- .drw 1,h'1234
- .page ;start on a new 256 byte boundary.
- loop2: .db loop2 >> 3
- .segment .rom2,-x'800 ;my programmer only likes 0..n addresses
- .rom2
- .org h'800
- .db "this is possibly an external rom programmed seperately."
- .code
- .end loop ;end of assembly, specifying start address.
-