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Re: What is the oldest computer that could be used today for real work? [message #410904 is a reply to message #410886] Sat, 11 September 2021 03:34 Go to previous messageGo to previous message
Anonymous
Karma:
Originally posted by: Thomas Koenig

Andreas Kohlbach <ank@spamfence.net> schrieb:
> On Fri, 10 Sep 2021 15:57:39 -0000 (UTC), Thomas Koenig wrote:
>>
>> J Clarke <jclarke.873638@gmail.com> schrieb:
>>> On Fri, 10 Sep 2021 01:35:34 -0000 (UTC), John Levine
>>> <johnl@taugh.com> wrote:
>>>
>>>> According to Thomas Koenig <tkoenig@netcologne.de>:
>>>> >> A brand new Z can emulate the 370/145. So can my Raspberry Pi if I
>>>> >> don't expect any performance.
>>>> >
>>>> >Surely, a higher performance than the original? ...
>>>
>>> No. The pi is painfully slow running the emulator.
>>
>> Slower than the original? How many cycles per S/360 instruction does
>> it take? If it was really slower than the original, it would have
>> to be more than 100 cycles per instruction. I find that hard to
>> believe.
>
> Having the issue here with an (aged) AMD PC. It's since years (software
> bloat over the years I assume) no longer able to emulated a Commodore 64
> with full speed (around 1 MHz for the 6510 CPU), while the host is
> supposed to run at 780 MHz (according to /proc/cpuinfo here in Linux), so
> 780 times faster.

That is a bit different. An emulator for a whole C-64 including
graphics and sound has to do much more work than an emulator for a
370/145 which did computation and I/O.

> Yeas ago it was able to emulate the C64 at its max
> speed, while I could run other tasks on the host at the same time.

"Other tasks" including running a browser?

I agree that modern software, also for Linux, has become incredibly
bloated. IIRC, the first Linux I ran at home was Slackware
0.99-something on a 486 with 4 MB running a simple window manager
and xterm. It wasn't as nice as the HP workstations I used
at the university, but it ran well enough.

Now... not a chance of getting things going with that setup.
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