Hi! Why not write a CGEN [1] cpu description for the f-cpu? This will give you both an assembler, a disassembler and a simulator. brgds johan [1] http://sources.redhat.com/cgen/ ************************************************************* To unsubscribe, send an e-mail to majordomo@seul.org with unsubscribe f-cpu in the body. http://f-cpu.seul.org/