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Additional resources for Machine Language for the Commodore 64 and Other Commodore Computers
First, we must set X to zero: A D33C LDX #$DD Note that we use the # symbol to denote an immediate value: we want to load X with the value zero, not something from address D. Now, we'll do something new. I want to take a character to be printed from address $D34 A. But wait, that's only the first time around. When we come back to this point in the loop, I want to take a character from $ D 3 A B, and then from $03 AC, and so on. How can we do this? It seems that we must write one address into the LDA instruction, and that address can't change.
When an interrupt occurs, this signals whether or not the interrupt was caused by a BRK instruction. D—Decimal mode indicator. This changes the manner in which the add and subtract instructions operate. In Commodore machines, this flag will always be off. Don't turn it on unless you know exactly what you're doing. This flag may be turned on with the SED (set decimal) instruction, and turned off with the CLD (clear decimal) instruction. I—Interrupt disable. More exactly, this bit disables the IRQ (interrupt request) pin activity.
We need to set up a program loop to repeat the printing activity. Let's write a program to print the word HELLO followed by a RETURN. C128 note: Remember to check Exercises for the Commodore 128, in Appendix E, for the appropriate coding. We must store the word HELLO somewhere in memory. It doesn't matter where, provided it doesn't conflict with anything else. I'll arbitrarily choose address $D34Ato$D34F. We'll put it there in a moment. Remember that the characters that make up the word HELLO (plus the RETURN) are not program instructions; they are simple data.