Dunno if this will be considered on-topic or not, as it's not about real hardware - if not, my humble apologies. Last night I released a Z80 emulator written in perl to the CPAN. You can download it from: http://search.cpan.org/~dcantrell/CPU-Emulator-Z80-0.9/ and the source is in CVS on sourceforget: http://drhyde.cvs.sourceforge.net/drhyde/perlmodules/CPU-Emulator-Z80/ It emulates almost all of the "undocumented" instructions, I/O, and interrupt mode 1. I am very grateful to the author of FUSE for licencing it in such a way that I could use his comprehensive suite of tests. Now I have to write an assembler, and have the fun of writing an operating system :-) -- David Cantrell | A machine for turning tea into grumpiness On the bright side, if sendmail is tied up routing spam and pointless uknot posts, it's not waving its arse around saying "root me!" -- Peter Corlett, in uknot