Kernel Hack brings Windows XP to the 486
THE venerable Intel 486 was released In 1989 as THE successor has THE extremely popular Intel 386. He was THE minimum recommended processor For the Windows 98. (Surprisingly, THE the Windows 95 minimum was A 386!) But by THE time XP rolled around, You necessary has less A 233 MHz Pentium has install. Or has less that was THE case until recently When A extremely dedicated user on MSFN appointed [Dietmar] watch how he pirate THE XP core SO he could run on THE classic chip!
THE the biggest issue to prevent XP Since functioning on earlier processors East A instruction introduced on THE Pentium: CMPXCHG8B. This instruction compared two 8 bytes values And takes different Actions depending on, depending on A equality test. He either copies THE 8 bytes has A destination address Or charges he In A 64-bit register. Basically, he do What he said on THE tin: he COMPARED And Exchanges a few values. If You to want has dig In THE the essential details, You can check out This Information on THE instruction taken Since THE x86 technical sheet.
Without get Also technical, know that This instruction East vital For performance When functioning with big data structures. This East because A instruction moves 8 bytes has A time, contrary to THE older CMPXCHG instruction, which only moves A Single byte. Basically, [Dietmar] had has find each use of CMPXCHG8B And replace he with A equivalent series of CMPXCHG instructions.
On A side note, THE once well known And devastating Pentium F00F bug was cause by A defective coding of THE CMPXCHG8B instruction. This allowed any of them user, even disadvantaged users, has completely lockdown up A system, demanding A complete reset cycle!
SO [Dietmar] was successful, And NOW You can run THE German version of the Windows XP on either A real 486 Or A emulated A. THE installer East available on THE the Internet Archive And There is A detailed video below demonstrating facility he on THE 86Box virtual machine host.
THANKS has [DosFox] For THE advice!
THE venerable Intel 486 was released In 1989 as THE successor has THE extremely popular Intel 386. He was THE minimum recommended processor For the Windows 98. (Surprisingly, THE the Windows 95 minimum was A 386!) But by THE time XP rolled around, You necessary has less A 233 MHz Pentium has install. Or has less that was THE case until recently When A extremely dedicated user on MSFN appointed [Dietmar] watch how he pirate THE XP core SO he could run on THE classic chip!
THE the biggest issue to prevent XP Since functioning on earlier processors East A instruction introduced on THE Pentium: CMPXCHG8B. This instruction compared two 8 bytes values And takes different Actions depending on, depending on A equality test. He either copies THE 8 bytes has A destination address Or charges he In A 64-bit register. Basically, he do What he said on THE tin: he COMPARED And Exchanges a few values. If You to want has dig In THE the essential details, You can check out This Information on THE instruction taken Since THE x86 technical sheet.
Without get Also technical, know that This instruction East vital For performance When functioning with big data structures. This East because A instruction moves 8 bytes has A time, contrary to THE older CMPXCHG instruction, which only moves A Single byte. Basically, [Dietmar] had has find each use of CMPXCHG8B And replace he with A equivalent series of CMPXCHG instructions.
On A side note, THE once well known And devastating Pentium F00F bug was cause by A defective coding of THE CMPXCHG8B instruction. This allowed any of them user, even disadvantaged users, has completely lockdown up A system, demanding A complete reset cycle!
SO [Dietmar] was successful, And NOW You can run THE German version of the Windows XP on either A real 486 Or A emulated A. THE installer East available on THE the Internet Archive And There is A detailed video below demonstrating facility he on THE 86Box virtual machine host.
THANKS has [DosFox] For THE advice!
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