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From: Robert Brockway <robert@timetraveller.org>
To: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Subject: Re: [TUHS] SUN (Stanford University Network) was PC Unix
Date: Thu, 15 Apr 2021 15:01:01 +1000 (AEST)	[thread overview]
Message-ID: <alpine.DEB.2.21.2104151421240.2534@mira.opentrend.net> (raw)
In-Reply-To: <alpine.BSF.2.21.9999.2104101311470.44871@aneurin.horsfall.org>

On Sat, 10 Apr 2021, Dave Horsfall wrote:

> On Fri, 9 Apr 2021, Paul Ruizendaal via TUHS wrote:
>
>> Z80 CP/M machines were still competitive in 1981-1983 (Osborne, Kaypro)
>
> And the Aussie Microbee...  Wonderful machine, and easily hacked upon.
>
> For example, you could expand the memory by soldering several chips on top of 
> each other and addressing the CS* line via bank-switching.

That worked on the old Radio Shack (Tandy) Color Computer 2 as well. 
Until this moment I didn't know it had been demonstrated on any other 
architecture.

The Operating System OS-9[1] Level One would detect this and use the 
bank-switched memory if it was available.  Presumably it kept identical 
copies of itself in each bank as the entire address space switched.

Microware OS-9 was *nix-like in look and feel although it was very 
different internally I think.  OS-9 still exists today.

I started with OS-9 and so found Unix a comfortable environment when I 
transitioned over.

[1] Which should not be confused with any operating system running on a 
Mac.  That's another story.

Rob

  parent reply	other threads:[~2021-04-15  5:12 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-09 15:34 Paul Ruizendaal via TUHS
2021-04-09 17:01 ` Dan Cross
2021-04-09 17:20   ` Lawrence Stewart
2021-04-09 18:32     ` Jon Steinhart
2021-04-09 22:28       ` Warner Losh
2021-04-10  3:16 ` Dave Horsfall
2021-04-10 12:06   ` David Arnold
2021-04-13 21:57     ` Dave Horsfall
2021-04-13 22:30       ` Bakul Shah
2021-04-15  5:01   ` Robert Brockway [this message]
2021-04-16  1:17     ` Brad Spencer
  -- strict thread matches above, loose matches on Subject: below --
2021-04-10  2:41 Jason Stevens
2021-04-09 14:41 Noel Chiappa
2021-04-09 15:18 ` Clem Cole
2021-04-09  5:31 Jason Stevens
2021-04-09  6:13 ` Jon Steinhart
2021-04-09  6:34   ` Rich Morin
2021-04-09 15:08     ` Clem Cole
2021-04-09  7:22 ` Lars Brinkhoff
2021-04-09  9:29   ` Lars Brinkhoff
2021-04-09 17:02   ` Al Kossow
2021-04-09 18:37     ` Lars Brinkhoff
2021-04-09 10:12 ` emanuel stiebler
2021-04-09 11:13   ` U'll Be King of the Stars
2021-04-09 17:22     ` Rob Gowin
2021-04-09 20:16       ` joe mcguckin
2021-04-10  2:22     ` Dave Horsfall
2021-04-09 14:08 ` Tom Lyon
2021-04-09 14:23   ` Jim Geist
2021-04-09 15:11   ` Clem Cole
2021-04-09 20:02     ` Earl Baugh
2021-04-09 20:08       ` Al Kossow
2021-04-09 20:46         ` Clem Cole
2021-04-10  1:30         ` Earl Baugh

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