The latest issue of the excellent Commodore FREE is out (issue 59), and is available at www.commodorefree.com. In it is the second part of my 6502 programming tutorials that I wrote for Micro Mart (issue 58 has parts one to four, followed in this issue by five to eight), for those who may be interested in learning a bit of machine code on the Commodore 64.
I'm really pleased with the number of reads of my Z80 tutorials here, so hopefully this will prompt a similar number to read Commodore FREE perhaps for the first time. Feel free to ask any questions here (including code examples), and I'll do my best to answer you.