assemblyintel-8080

Incrementing variable in assembly for 8080?

I'm working on a program for Intel 8080 right now and I don't really get how the space we can reserve for variables work. Namely, let's say we do test DB 80. Can I later somehow decrement or increment the variable test for example or do I have to declare it anew?

Solution

  • INR M instruction increments the byte content of the memory address pointed by HL register. So you can basically:

    LXI H, test
INR M