31 Dec
2018
31 Dec
'18
4:31 a.m.
On Dec 30, 2018, at 8:43 PM, Clem cole
<clemc(a)ccc.com> wrote:
The primary difference between the 11/40 class and 11/45 class is separate I/D space
which I sometimes refer to as the 17th address bit because it allows you a full 64k of
data space as well as a 64k of instructions space.
Do you know of some commonly used at the time v6 programs that needed that much space?
After you are booted, a 45 class machine will run 40
class binaries unchanged. 40 class machines can not run a.outs that are seperate I/D.
Good to know.
You’ll probably want to configure a kernel for the 45
class machine. Look at the differences in the *.s files in the kernel. IIRC there is a
different file for 40 class and 45 class systems
I read about this in ’Setting up Unix Sixth Edition” and I see the source comments. It
looks pretty straightforward to configure the system for separate I/D. Is there any
material difference between doing it at install time vs having run on 11/40 for a while
and moving the disk over to the 11/45 later?
On a related note, how difficult is it to copy the system from rk to hp? I know I can
rebuild, but I’m sure there’s a quicker/easier method...
That said if you running the simh I would recommend
going all the way to an 11/70 configuration because you can set it up for 4M of main
memory.
Maybe this will be the next upgrade :).