RL02 version of UNIX6?

Noel Chiappa jnc at mercury.lcs.mit.edu
Thu Feb 2 16:28:29 CST 2017


    > From: Allison

    > for laughs I wandered over to:
    > To see if the copy of V6 on RL02 is still there.... yep it is.

There are actually plenty of builds out there that run on RL11s, e.g.:

  http://www.tuhs.org/Archive/PDP-11/Distributions/other/Tim_Shoppa_v6/

includes "A V6 RL02 bootable on a 11/23. Kernel is built for a 11/23, 2
RL02's, and 2 RX02's"; and my V6, running under Ersatz-11, is also an
RL-based system.

The real issue with mixing and matching kernels and disks is that since the
RL was not a standard device (as far as 'mkconf' went), the RL's can have
different major device numbers on different systems.

This does not stop the system from _booting_, since internally there will be
consistency, but consistency between the OS and file system is another
matter: e.g. trying to mount another drive (or any other use of /dev/rl? or
/dev/rrl?) may not work, since the device inodes for /dev/rl? might have the
wrong major device numbers in them.


    > and it runs on a 11/23 just fine

Must be a slightly modified V6 - totally stock V6 will panic when it can't
find a clock (unless there's a BDV11), or NXM when it tries to touch the
switch register.

And for machines with no BDV11, I had to turn the clock off while booting;
the first time I tried to boot on a simulated 11/23, my totaly stock vanilla
V6 apparently took a timer interrupt during the boot process and went wayyyy
South, totally smashing the file system in the process. Not sure how the one
above dealt with this...

	Noel


More information about the cctech mailing list