In the CSRG DVD set there is some cci ports of 4.2BSD… stuff is #ifdef’d Tahoe in there so it’s not hard to pick out but it doesn’t seem to have anything really documents looking. I could be 100% wrong though, but they just look like ‘clean’ source trees. Not sure if sanitized though. The assembler shows 182 opcodes … /* * Boot program... arguments passed in r10 and r11 determine * whether boot stops to ask for system name and which device * boot comes from. */ /* r11 = 0 -> automatic boot, load file '/vmunix' */ /* r11 = 1 -> ask user for file to load */ The stand/boot sounds awefully vax like with r10/r11… From: Clem Cole Sent: Wednesday, 26 May 2021 11:22 pm To: Lars Brinkhoff Cc: Jason Stevens; tuhs@minnie.tuhs.org Subject: Re: [TUHS] H.J. Lu Bootable Root & Base System disks Really good point -- I saw some years ago, but never owned a copy. ᐧ On Wed, May 26, 2021 at 3:57 AM Lars Brinkhoff wrote: Jason Stevens wrote: > It took me years of on and off to finally figure out what the heck a > Tahoe even was.  Spoiler for anyone who wasn’t there when it happened > it’s a Harris HCX-9. > > But then again there is some movement on an RT emulator and there is > the 3b2 stuff so maybe there only needs to be a ‘push’… Is there even a single shread of documentation though?  It's a daunting task trying to write an emulator based only on inferring the internal workings of the machine from 4.3BSD source code.  Mind, the end result wouldn't be too interesting; hey it works... just like a VAX.