Sujet : Re: millicode, extracode, fractional PCs
De : johnl (at) *nospam* taugh.com (John Levine)
Groupes : comp.archDate : 02. May 2025, 18:26:19
Autres entêtes
Organisation : Taughannock Networks
Message-ID : <vv2v7r$17op$1@gal.iecc.com>
References : 1 2 3 4
User-Agent : trn 4.0-test77 (Sep 1, 2010)
According to moi <
findlaybill@blueyonder.co.uk>:
On 02/05/2025 16:18, EricP wrote:
>
And a paper on IBM Millicode which is kind of like Alpha PAL code
and may be similar to Robert's mega-ops.
The What and Why of System z Millicode 2012
https://share.confex.com/share/119/webprogram/Handout/Session11773/The%20What%20and%20Why%20of%20System%20z%20Millicode%20-%20%2311773.pdf
>
Thanks for that reference.
>
I struggle to see how "millicode" differs in essentials from
the "extracode" implementation of complex orders on the
Ferranti Orion & Atlas, or the ICT 1900 Series, of 60 years ago.
It looks very similar. The main difference I can see from extracode
is that extracode used the same hardware instruction set as normal
programs but millicode has a few extra instructions not usable
in normal programs.
Given that that deck credited Wilkes for microcode in the 1950s I'm
suprised they didn't mention extracodes. Surely they knew about it.
-- Regards,John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",Please consider the environment before reading this e-mail. https://jl.ly
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