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Re: What is the oldest computer that could be used today for real work? [message #411088 is a reply to message #411084] Sat, 18 September 2021 16:13 Go to previous messageGo to previous message
Anonymous
Karma:
Originally posted by: J. Clarke

On Sat, 18 Sep 2021 18:20:22 -0000 (UTC), John Levine
<johnl@taugh.com> wrote:

> It appears that Ahem A Rivet's Shot <steveo@eircom.net> said:
>> On Sat, 18 Sep 2021 04:07:50 -0000 (UTC)
>> John Levine <johnl@taugh.com> wrote:
>>
>>> According to Branimir Maksimovic <branimir.maksimovic@gmail.com>:
>>>> > You can still run programs compiled on a 360 on the latest ā€œzā€ box.
>>>> >
>>>> Why?
>>>
>>> Because they are still useful? Is this a trick question?
>>
>> I suppose the real question is why not recompile them to take
>> advantage of the newer hardware.
>
> A lot of 360 software was written in assembler. I gather a fair amount still is.
> For some they still have the source, some they don't, but even if they do, it's assembler.
>
> The newer hardware has bigger addresses and some more instructions but they don't run any faster.
> If you look at the zSeries principles of operation you can see the many hacks they invented to
> let old 24 bit addresss 360 code work with more modern 31 and 64 bit code.

Something that ran adequately on a machine with a 10 MHz clock will
generally run so much more than adequately on a machine with a 5 GHz
clock that there's not much incentive to optimize anyway.
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