[Simh] Simh Digest, Vol 46, Issue 20

[Davis Johnson]

    ************************************

>
> How hard would it be to get 3230 emulation in...?
>
> Gee, I'd kill to see Xelos up on a 3230 again...
>
> It was my first real sysadmin job after I left DEC Field Service...
>
> Probably impossible to get a copy legally or illegally, unfortunately.
> It's like Pyramid OS/x, another of my old fun favorites,  -- probably 
> unobtainium.
>
>
> Bill
> --
>   d|i|g|i|t|a|l had it THEN.  Don't you wish you could still buy it now!
> pechter-at-gmail.com <http://pechter-at-gmail.com> 

All in good time. There are quite a few differences between the 8/32 and 
the 3200 series. The 3220 is much like a 3230 with 8/32 MAC memory 
relocation/protection hardware. Doing the 3220 first lets me (almost) 
ignore memory management hardware and concentrate on CPU feature 
differences. It is a useful way to split the job. Once I finish the 3220 
(stalled at the moment, alas) I'll start working on the MAT used with 
the 3230/3210/3212, 3240/3250/3260 and 3205/3203 processors.

For various personal and practical reasons I don't intend to do a VAT 
(3280 and newer) implementation at this time. Concurrent still sells and 
supports OS/32 and 3200 systems. I know or have met some of the people 
involved. Not emulating the VAT prevents the current version of OS/32 
from running on SIMH. The VAT is a complicated and lightly documented 
bit of kit to emulate. The same can be said for the MAT, but the MAT is 
needed to address more than 1MB of memory and to run some software. I 
rather suspect that having done the MAT I'll be ready to do something 
else for a while.

Because Xelos is SVR2, the Unix part of Xelos is not covered by the 
"Ancient Unix license". The Perkin-Elmer part, of course, belongs to 
Concurrent. Licensing is an issue. Perhaps when the SCO distraction is 
over this can be resolved.

The Edition VII available from bitsavers appears to be the original 
version from Wollongong University. It would be nice to have the 
Perkin-Elmer commercial release version. It has some additional nice 
stuff in it. That also has content that belongs to Concurrent.
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