[TUHS] PC/IX, VPIX, DOS/merge, etc. [was Re: History of non-Bell C compilers?
Charles H Sauer (he/him)
sauer at technologists.com
Thu Mar 14 01:50:06 AEST 2024
Heinz would certainly be more definitive than me regarding the ISC
products, but ...
o IIRC, the name "PC/IX" was only used for the PC/XT release
- PC/IX was my first hands on access to Unix
- VPIX was bundled with PC/IX version
- I used VPIX minimally, don't remember much about it
- when I got a PC/AT for my office, I switched to Xenix because it took
advantage of the 286
- there are various copies of PC/IX available, e.g.,
https://winworldpc.com/product/pc-ix/10, also subsequent ISC 386
products there, pursuing is buried deep on my todo list
o Dell SVR3 was based on Interactive UNIX for 386, but eschewed VPIX in
favor of DOS/Merge from LCC
(https://notes.technologists.com/notes/2008/01/10/a-brief-history-of-dell-unix/)
o Dell SVR4 was independent of both ISC & LCC except that it included
DOS/merge
- the Dell SVR4 that I've made available for ancient hardware, 86Box and
VirtualBox runs DOS/merge acceptably in my minimal testing
Charlie
On 3/13/2024 10:33 AM, Warner Losh wrote:
>
>
> On Wed, Mar 13, 2024, 9:28 AM Marc Rochkind <mrochkind at gmail.com
> <mailto:mrochkind at gmail.com>> wrote:
>
> @Clem Cole <mailto:clemc at ccc.com>,
>
> I don't remember what it was. But, the XT had an 8088, so certainly n
>
> o 386 technology was involved.
>
>
> Venix could also run DOS. There is a kernel module (well .o) that
> handles it...
>
> Warner
>
> Marc
>
> On Wed, Mar 13, 2024 at 8:38 AM Clem Cole <clemc at ccc.com
> <mailto:clemc at ccc.com>> wrote:
>
> @Marc
>
> On Tue, Mar 12, 2024 at 1:18 PM Marc Rochkind
> <mrochkind at gmail.com <mailto:mrochkind at gmail.com>> wrote:
>
> At a trade show, I bought a utility that allowed me to run
> PC-DOS under PC/IX. I'm sure it wasn't a virtual machine.
> Rather, it just swapped back and forth. (Guessing a bit there.)
>
> Hmm ... you sure it was not either VPIX or DOS/Merge -- ISC
> built VPIX in cooperation with the Phoenix Tech folks for PC/IX.
> I always bought a copy with it, but it may have been an option.
> LCC did DOS/Merge originally as part of the AIX work for IBM
> and would become a core part of OS/2 Warp IIRC. Both Merge and
> VPIX had some rough edges but certainly worked fine for DOS 3.3
> programs. The issue tended to be Win and DOS graphics-based
> programs/games that played fast and loose, bypassing the DOS OS
> interface and accessing the HW directly. For instance, I never
> got the flight simulator (Air War over Germany) for Dad's WWII
> plane (P-47 Thunderbolt) to run under either (i.e., only under
> DOS directly on the HW. FWIW: In that mode, Dad said the
> simulator flew a lot like how he remembered it).
>
> Both Merge and VPIX used the 386 VM support and a bunch of work
> in the core OS. Heinz would have to fill us in here. The
> version of the 386 port ISC delivered to AT&T and Intel only had
> the kernel changes to allow the VM support for VPIX to be linked
> in, but it was not there. IICR (and I'm not sure I am) is that
> Merge could run on PC/IX also, but you had to replace a couple
> of kernel modules. It certainly would work on the AT&T and
> Intel versions.
> ᐧ
>
>
>
> --
> /My new email address is mrochkind at gmail.com
> <mailto:mrochkind at gmail.com>/
>
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