Re: [TUHS] Fwd: Choice of Unix for 11/03 and 11/23+ Systems

[Paul Riley <paul@rileyriot.com>]

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Noel,




*Mini-Unix has removed 'raw' devices (not sure why, probably seemed
un-needed),so other disk drivers (e.g. the RL11 driver) aren't straight
drop-ins. Minimaltweaks needed, though; just remove the read and write
routines, I think.*

Your great work to port Mini-Unix will create some demand for device
drivers on the /03 systems, so may be worthwhile to implement RAW device.

Paul


*Paul Riley*

Mo: +86 186 8227 8332
Email: paul@rileyriot.com



On Sun, 11 Oct 2020 at 07:31, Noel Chiappa <jnc@mercury.lcs.mit.edu> wrote:

>     > I noticed a place where I used R0 as a temp ... and was being bashed.
>     > So I fixed it, and now the shell starts OK, but attempting to do any
>     > command (e.g. "echo foo"), things hang
>
> Well, I had 'fixed' it; it turned out my 'fix' had a bug. :-( (The code I
> had
> to change for the /03 there was pushing the old PS, and that and the temp I
> had to push got intermangled.)
>
> Anyway, with that fixed, the /03 Mini-Unix works now. The old user command
> binaries seem to work OK on the /03; not that I've tried the all, but the
> ones
> I have tried (including the C compiler) all worked. They all should all
> work
> (there's nothing in user code that's model-dependent). I have tweaked the
> shell (to allow 'cd') and init (to get rid of the annoying long rights
> message), but that's all.
>
> The latest, greatest mch.s is uploaded:
>
>   http://ana-3.lcs.mit.edu/~jnc/tech/unix/Mini/mch.s
>
> Although a couple of files (bio.c, clock.c, slp.c, and tty.c) had minor
> changes (to remove direct rerferences to the PS; they now call getps() and
> putps() for that), and main.c has minor changes to work when there's no
> KW11
> or switch register, really the only file with significant changes for the
> /03
> is mch.s. It's the only one where the object code is model-dependent; all
> the
> other changed ones use the same object code for all CPU models.
>
> I'll put up a Web page with details, links to sources, etc, 'soon'.
>
>
> A couple of other things.
>
> Mini-Unix has removed 'raw' devices (not sure why, probably seemed
> un-needed),
> so other disk drivers (e.g. the RL11 driver) aren't straight drop-ins.
> Minimal
> tweaks needed, though; just remove the read and write routines, I think.
>
> If there was a real use for 'raw' devices, they could probably be added
> back,
> but physio() would have to be modified (simplified). Not sure if anything
> else
> special would be needed; the process can't be swapped while raw I/O is
> ongoing, and so on Mini-Unix no other process could run. Probably OK, but
> needs to be checked.
>
> I recommend that everyone trying to run Mini-Unix on a hardware /03 invest
> in
> a KEF11 chip. (There are a few on eBait.) That way, you can leave the EIS
> emulator out of the build, which will save some space, and allow more room
> for
> device drivers. I added kernel printf() into the build, to help with
> debugging, but it can be removed to save space.
>
> You can change the system to use more room for the kernel (see the
> Mini-Unix
> docs), but that involves re-linking _every single user command_, including
> the
> shell and init. Not recommended.
>
>       Noel
>

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