Crasm is a portable assembler for several 8 bit processors, initially written in 1987 for AmigaOS. It supports the 6800, 6801, 6803, 6502, and Z80 microprocessors. It comes with a number of small examples, including the 6801 firmware of my first homemade modem, and the famous 6502 Microchess program¹⁾.

• Crasm home page http://crasm.sourceforge.net