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By William F. Luebbert
This revised variation will supply either a numerical atlas and an alphabetical Gazetteer, publications the consumer to over 2,000 reminiscence destinations of PEEKs, POKEs, and CALLs.
Names and destinations of varied computer screen, DOD, Interger uncomplicated, and Applesoft exercises are indexed, and knowledge is equipped on their use.
Applesoft and Interger easy clients will locate info with the intention to accelerate and streamline courses. meeting language clients will achieve entry to workouts so that it will simplify coding and interfacing. either uncomplicated and meeting language clients will locate this publication worthwhile in realizing the Apple II, and crucial for getting to know it!
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Additional info for What's Where in the Apple. A Complete Guide to the Apple Computer
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Parameter A1 tells it to start at location 0 (where the MSP of the number is located? and to print the hexadecimal contents of memory locations through that specified by parameter A2, which turns out to be only through location 1 (where the LSP 'of the number is located). Thus, only two locations are printed: that containing the MSP and that containing the LSP. These two locations contain the number which was to be printed in hexadecimal form. 5. Unfortunately the subroutine at -589 also prints the starting memory location for the group of values that it prints out.
3 In-Depth Case Study: Calling a Subroutine with Parameters in Monitor-Specified Memory Locations. 1 2 REM REM ***************************** 3 5 REM * 6 7 8 9 REM REM REM REM * * * * CASE STUDY NO. 4 WHAT'S WHERE IN THE APPLE QUICK DECIMAL TO HEXADECIMAL CONVERSION * * * * * ***************************** REM 10 HOME 15 HOME 20 MSP = 30 LSP = 40 POKE 50 POKE 60 CALL 70 POKE 80 POKE 90 VTAB : VTAB 7: PRINT "ENTER DECIMAL NUMBER";: INPUT N : VTAB 7: PRINT " DEC= ";N INT (N I 256): POKE O,MSP: REM MSP •> LOCATION 0 N- 256 * INT (N I 256): POKE 1,LSP: REM LSP =>LOCATION 1 60,0: POKE 61,0: REM 0 => PARAMETER A1 62,1: POKE 63,0: REM 1 => PARAMETER A2 - 589: REM ROUTINE TO HEX PRINT MEMORY FROM A1 TO A2 (0-1) 1064,160: POKE 1065,200: POKE 1066,197: POKE 1067,216 1068,189: POKE 1069,160: REM POKE TO SCREEN "HEX = " 11: PRINT "PRESS ANY KEY TO CONTINUE";: GET R$: GOTO 10 Analysis: The best way to start is to look up the memory locations involved in the Programmers' Atlas: 1.
3 In-Depth Case Study: Calling a Subroutine with Parameters in Monitor-Specified Memory Locations. 1 2 REM REM ***************************** 3 5 REM * 6 7 8 9 REM REM REM REM * * * * CASE STUDY NO. 4 WHAT'S WHERE IN THE APPLE QUICK DECIMAL TO HEXADECIMAL CONVERSION * * * * * ***************************** REM 10 HOME 15 HOME 20 MSP = 30 LSP = 40 POKE 50 POKE 60 CALL 70 POKE 80 POKE 90 VTAB : VTAB 7: PRINT "ENTER DECIMAL NUMBER";: INPUT N : VTAB 7: PRINT " DEC= ";N INT (N I 256): POKE O,MSP: REM MSP •> LOCATION 0 N- 256 * INT (N I 256): POKE 1,LSP: REM LSP =>LOCATION 1 60,0: POKE 61,0: REM 0 => PARAMETER A1 62,1: POKE 63,0: REM 1 => PARAMETER A2 - 589: REM ROUTINE TO HEX PRINT MEMORY FROM A1 TO A2 (0-1) 1064,160: POKE 1065,200: POKE 1066,197: POKE 1067,216 1068,189: POKE 1069,160: REM POKE TO SCREEN "HEX = " 11: PRINT "PRESS ANY KEY TO CONTINUE";: GET R$: GOTO 10 Analysis: The best way to start is to look up the memory locations involved in the Programmers' Atlas: 1.