Julf wrote: > Indeed. On the PDP-10 (and PDP-20) a byte could be anything from 5 bits > up. Memory was 36 bits wide. with 18 bit word addresses, so a byte > pointer was 18 bits word address, and 18 bits of type flags, the > infamous indirect bit, and byte length and offset (into the word) of the > first bit - so you could even mix different byte sizes in the same word.
A fellow PDP-10 coder on DECystem-10/DECsystem-20 with odd instruction mnemonics such as HRRZM, AOBJN. The indirect bit where, in assembler, you could do multiple levels of table lookup in just one instruction - great fun to code but nearly impossible to maintain. ------------------------------------------------------------------------ bpa's Profile: http://forums.slimdevices.com/member.php?userid=1806 View this thread: http://forums.slimdevices.com/showthread.php?t=116079 _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/discuss
