This series by the legendary Jim Butterfield explains Machine Language was taken from various Compute! magazines in 1982 & 1983. Most of the items are general but the articles were targeted at Commodore Computers.
Jim Butterfield Explains Machine Language IRQ’s – Compute September 1982
Jim Butterfield Explains Machine Language Hex – Compute December 1982
Jim Butterfield Explains Machine Language Numeric Output – Compute May 1983
MORE: Jim Butterfield Explains Machine Language Numeric Output
Jim Butterfield Explains Machine Language Test Program – Compute August 1983