Re: [TUHS] Zilog Z80 Unix

not to forget Sun UNIX 0.7 (Sun-1) From: jnc(a)mercury.lcs.mit.edu (Noel Chiappa)Sent: Thu, 20 Apr 2017 18:04:53To: tuhs(a)tuhs.orgCc: jnc(a)mercury.lcs.mit.eduSubject: Re: [TUHS] Zilog Z80 Unix   > From: "Erik E. Fair"   > I have a memory of having seen a Zilog Z-80 .... based Unix, possibly v6   > ... I recall asking the people in the booth how they managed without an   > MMU, and don't recall their answer. I do remember thinking that since   > Unix had "grown up" with MMUs to stomp on obvious pointer mistakes, the   > software ought to be relatively well-behavedI don't know about the Z80 part, but for the MMU aspect, recall that the firstcouple of versions of PDP-11 Unix ran on a model (the -11/20) which didn'thave an MMU (although, as mentioned before here, it apparently did later use athing called a KS11, the specifications for which seem to be mostly lost).A lthough recall the mention of calling out "a.out!", as to the hazards ofdoing so...And of course there was the 'Unix for an LSI-11' (LSX), although I gather thatwas somewhat lobotomized, as the OS and application has to fit into 56KBtotal.So it was possible to 'sorta kind-of' do Unix without an MMU.  Noel