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Re: Windows 32-bit

From Paul <nospam@needed.invalid>
Newsgroups comp.os.ms-windows.misc, alt.comp.os.windows-xp, alt.windows7.general, microsoft.public.windowsxp.general
Subject Re: Windows 32-bit
Date 2023-12-30 23:14 -0500
Organization A noiseless patient Spider
Message-ID <umqps0$1kfau$1@dont-email.me> (permalink)
References (4 earlier) <f2usoi10fo0tv1v1npe4v2lijp8g2vqe9a@4ax.com> <umms19.i7o.1@ID-201911.user.individual.net> <AvORUBn4jxjlFwEZ@255soft.uk> <3fj0pi1he28cfgbul4lbmu4jua526btugq@4ax.com> <$93+An1C1HklFwbp@255soft.uk>

Cross-posted to 4 groups.

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On 12/30/2023 3:27 PM, J. P. Gilliver wrote:
> In message <3fj0pi1he28cfgbul4lbmu4jua526btugq@4ax.com> at Sat, 30 Dec 2023 12:10:57, Tim Slattery <TimSlattery@utexas.edu> writes
>> "J. P. Gilliver" <G6JPG@255soft.uk> wrote:
>>
>>
>>> For 386 and 486, the confusingly changed what "SX" and "DX" meant; on
>>> one (I forget which), SX meant it _didn't_ have a floating-point maths
>>> co-processor on board, DX meant it did. On the other, SX meant it had a
>>> half-width (so 16?) bus outside the chip (so requiring two fetches to
>>
>> The 486 was the first Intel chip to have the numeric coprocessor
>> onboard. Intel wanted to prese4ve the "SX" price point, so they
>> produced a 486SX chip which was identical to the DX except that the
>> numeric coprocessor was disabled! Machines sold with this chip had an
>> empty socket where you could plug in a 486DX chip to get a coproc. So
>> once you did that, you could unplug the SX chip and use it elsewhere,
>> right? WRONG!!! It was set up so that the DX in those machines
>> wouldn't work unless the SX was plugged in, doing nothing.
>>
> Did anyone ever manage to "crack" the 486SX or the 487 to enable the disabled part, or make it work without the other?

You will remember that these were simpler times.

Intel has much better mechanisms "to enforce this or that" today.

   https://www.vogons.org/viewtopic.php?t=68471

Today we have sharks with lasers on their heads. Back then,
all we had was sharks.

   Paul

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  Re: Windows 32-bit Frank Slootweg <this@ddress.is.invalid> - 2023-11-17 16:16 +0000
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      Re: Windows 32-bit Frank Slootweg <this@ddress.is.invalid> - 2023-11-19 19:34 +0000
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              Re: Windows 32-bit Tim Slattery <TimSlattery@utexas.edu> - 2023-12-30 12:10 -0500
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  Re: Windows 32-bit Paul <nospam@needed.invalid> - 2023-11-18 06:53 -0500
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  Re: Windows 32-bit Java Jive <java@evij.com.invalid> - 2023-11-19 13:59 +0000
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