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85 lines
1.6 KiB
Plaintext
85 lines
1.6 KiB
Plaintext
/************************************
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* POINTERS - Test pointer.h02 Library *
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************************************/
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#include "include/vic20.h02"
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#include <stdio.h02>
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#include <pointer.h02>
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char savelo, savehi; //Pointer Storage Variable
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char ptemp; //Memory Marker for Compare
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main:
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//Set Pointer to Cassette Buffer
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putstr("SET POINTER TO TBFFR");
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ptrset(&tbffr);
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prpntr();
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newlin();
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//Demonstrate Compare
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putstr("COMPARE AGAINST");
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outstr(" TEMP0 $");
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prbyte(ptrcmp(&temp0)); newlin();
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outstr(" TBFFR $");
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prbyte(ptrcmp(&tbffr)); newlin();
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outstr(" PTEMP $");
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prbyte(ptrcmp(&ptemp)); newlin();
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newlin();
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anykey();
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//Demonstrate Get, Put, Inc, and Dec
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putstr("PUT '*' AT POINTER");
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ptrput('*');
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prpntr();
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putstr("DECREMENT POINTER");
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ptrdec();
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prpntr();
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outstr("GOT FROM POINTER: ");
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putchr(ptrget());
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newlin();
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prpntr();
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putstr("INCREMENT POINTER");
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ptrinc();
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prpntr();
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newlin();
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//Demonstrate Add and Subtract
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putstr("ADD $FF TO POINTER");
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ptradd($FF);
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prpntr();
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putstr("SUBTRACT $FF");
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ptrsub($FF);
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prpntr();
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newlin();
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anykey();
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//Demonstrate Save and Restore
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putstr("SAVE POINTER");
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savelo = ptrlo; savehi = ptrhi;
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putstr("CLEAR POINTER");
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ptrlo = 0; ptrhi = 0;
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prpntr();
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putstr("RESTORE FROM PSAVE");
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ptrlo = savelo; ptrhi = savehi;
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prpntr();
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goto exit;
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//Print Pointer Contents
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void prpntr() {
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outstr(" POINTER IS NOW ");
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prbyte(ptrhi);
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prbyte(ptrlo);
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newlin();
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}
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//Wait for Keypress
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void anykey() {
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putstr("PRESS ANY KEY...");
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getchr();
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newlin();
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newlin();
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} |