On 2009-08-22, Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote: > On Fri, 21 Aug 2009 10:45:51 -0700, John Nagle <na...@animats.com> > declaimed the following in gmane.comp.python.general: > >> >> And it's over. We can finally dispense with octal by default. >> > I've not looked at modern Intel processor format, but if there are > folks still using variants of 8080 (8051?) and Z-80, Octal still works > nice for op-codes... I don't recall the exact values, but the MOV > instruction was something like '1SD'o, where S and D are three bit > register specifications (A, B, C, D, E, H, L, and Memory as I recall)
The Heathkit's terminal I have uses a Z80, and IIRC, the assembly listings were in split-octal [a 16 bit word ranges from 000 000 to 377 377]. Stuff for the PDP-11 (which also had instruction fields 3 bits wide) was always in octal as well. The PDP-11 is pretty much dead, but I think there are embedded Z80 derivitives still in use. -- Grant -- http://mail.python.org/mailman/listinfo/python-list
