Some corrections related to Mach and Apple. TTFN - Guy
> On Oct 22, 2018, at 2:40 PM, Jim Manley via cctalk <cctalk@classiccmp.org> > wrote: > > > > BTW, MacOS X is based on Mach, the version of Unix that was designed for > multiple, closely-coupled processors, and it, too, uses X as a basis for > its GUI. No. Mach is a microkernel based system that split apart BSD into “kernel” portions and Unix portions. It really didn’t have anything to do with SMP as the premise behind Mach (which was a furthering of Accent) was message passing between tasks. I can dig up the original papers if anyone is interested. ;-) OS X does *not* use X as the basis of its GUI. It stems from NEXT which used display postscript (modern OS X uses display PDF). An (optional) X server (and clients) can be added to the OS (I use them all the time) but is not part of the base install which belies the comment of X as the basis of the GUI. BTW, the X server on OS X, interfaces not to the bit-map but instead to the native OS X display rendering framework. TTFN - Guy