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- From: root@rkamiga.UUCP (Rick Kelly)
- Newsgroups: comp.sys.amiga.misc
- Subject: Re: Random musings
- Distribution: world
- Message-ID: <root.02u9@rkamiga.UUCP>
- References: <Qf0xjYm00WDNQPCLY9@andrew.cmu.edu> <S37732V.92Nov14112613@lk-hp-16.hut.fi> <mwm.2n3h@contessa.palo-alto.ca.us>
- Date: 15 Nov 92 17:17:29 EST
- Organization: Rick's Amiga
- Lines: 46
-
- In article <mwm.2n3h@contessa.palo-alto.ca.us> mwm@contessa.palo-alto.ca.us (Mike Meyer) writes:
- >In <S37732V.92Nov14112613@lk-hp-16.hut.fi>, s37732v@snakemail.hut.fi (Markus Juhani Aalto) wrote:
- >> The UNIX (low level) is quite a different compared to Amiga Exec. Current
- >> Exec design allows it to multitask efficiently in machines with even
- >> 256K (remember the old A1000) of memory. This is something UNIX, Window
- >> etc.. can't do. It was a design decision made long time back when 68000
- >> was still considered very powerfull processor, but still not powerfull
- >> enough to run system like UNIX.
- >
- >1) 68000s *WERE* powerfull enough to Run Unix. What do you think the
- >first Suns were built around?
-
- That's right. And even today, the entry level system from Charles River
- Data Systems is a VME system with a 12 Mhz 68000 as the main cpu and
- another 12 Mhz 68000 to handle serial i/o. One of these systems can
- easily handle 20 users doing routine office tasks on dumb terminals.
-
- >2) AmigaDOS *NEVER* ran on a 256K machine. The old A1000s had 256K of
- >OS in WCS as well as the 256K of RAM. Unix machines of that era had
- >just enough smarts to load the first block from some device into ROM.
- >Unix machines currently have low-level debuggers in ROM; in both cases
- >most of the stuff that the Amiga puts in ROM winds up in the RAM on
- >the machine.
-
- The base A1000 came with only 256k of memory, but you needed the 256k
- board for the front slot to do anything useful.
-
- >3) Even with having to put the OS in RAM, UNIX used to run quite
- >nicely in 256K. Even as a multi-user system. But that was back when it
- >only had one file system, and no networking, and no windowing system,
- >and one person running Emacs could kill the system. Those sytsems
- >didn't have demand paging, but it did have memory protection.
-
- PC/IX, which was ported from AT&T V7 source code, ran on a 4.77 Mhz PC/XT
- with 256k of memory and a 10 meg disk.
-
- SVR3 ran on the AT&T UNIX PC, which had a 68010. The minimum config was
- 256k of memory and a 20 meg disk. It had the novel concept of shared
- libraries. As recently as a year ago you could buy one of these new from
- a warehouse sale.
-
- --
- Rick Kelly Rick's Amiga Framingham, Mass.
-
- think!unixland!rmkhome!rkamiga!root
-
-