Are there any #MC68000 #mc68k gurus in the audience?
If a program running in usermode accesses the vectors via a data access instruction - what does the 68010 indicate on the function code pins?
Are vector reads escalated to being supervisor code/data reads, even though the code which triggered them is user-mode?

I'm trying to figure out why dereferencing a null pointer is 'fine' on a real #UnixPC but causes problems with the FreeBee emulator (if I disable vector access promotion).

#RMC - The Forgotten #Commodore900, we look at a #Rare #Prototype

Amazing. I have never come across this machine at all. A #Commodore machine running #UNIX would have been a sight to see.

https://www.youtube.com/watch?v=PbVjNInzrw8&ab_channel=RMC-TheCave

#CBM #RetroComputing #16Bit #16BitComputer #16BitComputers #16BitMachine #16BitPC #UNIXPC #1980s #80s

Here's my #throwbackthursday contribution. This was my bedroom in 1988.

The large rack contained my #pdp11 34, with an RL02 drive under it. In the corner is an ATT #3b1 (aka #unixpc), with an old #mac next to it.

The thing I really miss is the #dec #gigi terminal in the middle. Very hard to find now. It was a graphics #vt100 compatible terminal.

The PDP11 ran #rsts. There's 2 more racks full of hardware for it off to the left. Was like being next to jetliner when it was running.

RT @[email protected]: @[email protected] The AT&T 7300 Unix PC was much better. MC68010 processor, System V Release 2 Unix. Developed by Convergent for AT&T. Later version with higher capacity HD was the AT&T 3B1.
#UnixPC

🐦🔗: https://twitter.com/brouhaha/status/1029590323444346880