Hello! Would the Octal reference for $FF be used because one of the authors of emulator would be more familiar with those terms from working with the one for the PDP-11?
I've seen the crowd courtesy the VCF and have a box here who's waiting to be restored. Oddly enough I came within a big something-else to own one (an Altair or IMSAI or the Heathkit version) a long time ago. ----- Gregg C Levine [email protected] "This signature fought the Time Wars, time and again." On Mon, Feb 2, 2015 at 10:40 AM, Clem Cole <[email protected]> wrote: > > On Mon, Feb 2, 2015 at 10:16 AM, Bailey, Scott <[email protected]> wrote: >> >> Non-existent memory. On the 8080, reads to non-existent memory >> return 0377, and writes are ignored. > > > That was definitely true and how the HW worked [although the comment should > have been 0xFF or actually $FF in Intel syntax - since the 8080s were > defined in hex not octal like PDP-11s). There was no non-existent memory > trap for the bus, so the HW read the data back as 0xFF because of TTL > floating to high. > > I do miss the Altair and Imsai machines in a strange sort of way ;-) > > Clem > > > _______________________________________________ > Simh mailing list > [email protected] > http://mailman.trailing-edge.com/mailman/listinfo/simh _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
