mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
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170 lines
4.5 KiB
Plaintext
170 lines
4.5 KiB
Plaintext
*
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********************************
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* *
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* -< COMMON DEMO )- *
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* *
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* VERSION 0.3.0 *
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* *
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* 10-JAN-2019 *
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* *
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********************************
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* *
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* NATHAN D. RIGGS *
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* NATHAN.RIGGS@OUTLOOK.COM *
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* *
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********************************
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*
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** ASSEMBLER DIRECTIVES
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*
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CYC AVE
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EXP ONLY
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TR ON
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DSK COMMON.DEMO
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OBJ $BFE0
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ORG $6000
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*
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*``````````````````````````````*
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* TOP INCLUDES (HOOKS,MACROS) *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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PUT REQUIRED.VARS
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USE REQUIRED.MAC.MIN
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PUT REQUIRED.HOOKS.MIN
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USE COMMON.MAC.MIN
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PUT COMMON.HOOKS.MIN
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*
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*``````````````````````````````*
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* PROGRAM MAIN BODY *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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** MFILL DOES ABOUT WHAT ITS NAME
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** IMPLIES: IT FILLS A BLOCK OF MEMORY
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** WITH A PARTICULAR CHARACTER.
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*
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_PRNT " ",8D8D
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MFILL #$300;#10;#0
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_PRNT "MFILL FILLS A PORTION OF MEMORY WITH",8D
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_PRNT "A SPECIFIED VALUE. ",8D8D
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_DUMP $300;#10
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_WAIT
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*
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** MMOVE ALSO DOES WHAT IT SAYS: IT MOVES
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** A BLOCK OF MEMORY FROM A SOURCE LOCATION
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** TO A DESTINATION LOCATION. WE'LL NOW MOVE
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** THOSE ZEROES PLACED BY MEMFILL TO ANOTHER
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** LOCATION.
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*
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_PRNT " ",8D8D
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_PRNT "MMOVE COPIES A SPAN OF MEMORY",8D
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_PRNT "FROM A SOURCE TO A DESTINATION ADDRESS.",8D8D
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_PRNT "SO MOVING $300 TO $320 RESULTS IN:",8D8D
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MMOVE $300;$320;#10
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_DUMP $320;#10
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_WAIT
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*
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** DELAY RUNS THROUGH CYCLES OF THE
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** 6502 UNTIL A CERTAIN AMOUNT OF TIME
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** HAS PASSED.
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*
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_PRNT " ",8D8D
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_PRNT "DELAY DELAYS A SPECIFIED NUMBER OF",8D
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_PRNT "MILLISECONDS. 250 MILLISECONDS = 1/4 SECOND.",8D8D
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*
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DELAY #250 ; TIME IN MILLISECONDS
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; IS PASSED VIA Y
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; 250 = 1/4 SECOND
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BEEP 1
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_PRNT "1/4 SECOND",8D
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DELAY #250
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BEEP 2
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_PRNT "1/4 SECOND",8D
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DELAY #250
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BEEP 3
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_PRNT "1/4 SECOND",8D
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DELAY #250
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BEEP 4
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_PRNT "1/4 SECOND",8D
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*
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_PRNT " ",8D8D
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_WAIT
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*
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** ZSAVE BACKS UP THE "FREE" AREAS OF
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** THE ZERO PAGE TO AN ALTERNATE MEMORY
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** LOCATION. THIS IS MOSTLY USEFUL WHEN
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** YOU KNOW A ROUTINE USES THE ZERO PAGE,
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** BUT YOU WANT TO KEEP THE VALUES CURRENTLY
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** STORED THERE AFTER CALLING THE ROUTINE.
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*
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** NOTE THAT SINCE THE LIBRARY MAKES HEAVY USE
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** OF THESE MEMORY ADDRESSES, ANY TIME YOUR CODE
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** MAKES USE OF THE ZERO PAGE, IT IS ADVISED TO
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** SAVE THE STATE BEFORE CALLING ANY OTHER ROUTINES.
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*
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LDA #01
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STA $06
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LDA #02
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STA $07
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LDA #03
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STA $08
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LDA #04
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STA $09
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ZSAVE $300
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*
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_PRNT " ",8D8D
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_PRNT "ZSAVE SAVES THE STATE OF THE ZERO PAGE ",8D
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_PRNT "ADDRESSES THAT ARE NOT USED BY DOS,",8D
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_PRNT "APPLESOFT,PRODOS OR INTEGER BASIC.",8D8D
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_PRNT "SO THE BACKED UP ZERO PAGE AT $300 IS:",8D8D
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_DUMP $300;#18
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_PRNT " ",8D8D
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_PRNT "18 BYTES ARE USED.",8D8D
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_WAIT
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*
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** YOU CAN RESTORE THE ZERO PAGE TO ITS
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** PRIOR STATE BY THEN CALLING ZLOAD.
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*
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ZLOAD $300
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*
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_PRNT " ",8D8D
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_PRNT "YOU CAN THEN RESTORE THE FREE ZERO PAGE",8D
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_PRNT "LOCATIONS WITH ZLOAD. THERE ISN'T ANY",8D
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_PRNT "MEANINGFUL OUTPUT TO PUT HERE TO ",8D
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_PRNT "ILLUSTRATE THAT, SO USE YOUR IMAGINATION!",8D8D
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_WAIT
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*
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** THE MSWAP MACRO SWAPS THE MEMORY BLOCK AT ONE
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** ADDRESS WITH THE SAME LENGTH AT ANOTHER.
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*
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_PRNT "THE MSWAP MACRO SWAPS A LENGTH",8D
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_PRNT "OF MEMORY FROM ONE LOCATION",8D
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_PRNT "TO ANOTHER. SO, BEFORE SWAP:",8D8D
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_DUMP $300;#10
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_DUMP $320;#10
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MSWAP $300;$320;#10
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_PRNT " ",8D
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_PRNT "AND AFTER SWAP: ",8D8D
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_DUMP $300;#10
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_DUMP $320;#10
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_WAIT
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*
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JMP REENTRY
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*
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*``````````````````````````````*
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* BOTTOM INCLUDES *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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** BOTTOM INCLUDES
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*
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PUT REQUIRED.LIB.MIN
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*
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** INDIVIDUAL SUBROUTINE INCLUDES
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*
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* COMMON LIBRARY SUBROUTINES
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*
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PUT MEMFILL.SUB.MIN
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PUT MEMMOVE.SUB.MIN
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PUT DELAYMS.SUB.MIN
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PUT ZMSAVE.SUB.MIN
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PUT ZMLOAD.SUB.MIN
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PUT MEMSWAP.SUB.MIN
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