invalid opcode 0f44

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roytam1
Posts: 14
Joined: Mon 27 Oct, 2014 2:27 am

invalid opcode 0f44

Postby roytam1 » Wed 06 Dec, 2017 3:32 pm

PCem v12
CPU: Pentium MMX 233 and WinChip 240 are tried with same result.
roytam1
Posts: 14
Joined: Mon 27 Oct, 2014 2:27 am

Re: invalid opcode 0f44

Postby roytam1 » Wed 06 Dec, 2017 3:54 pm

Oops, thtat is a CMOV instruction. Is any of PCem emulated CPU support this?
szadycbr
Posts: 185
Joined: Mon 21 Nov, 2016 6:23 pm

Re: invalid opcode 0f44

Postby szadycbr » Wed 06 Dec, 2017 4:55 pm

quick google, and it appears that it first was introduced in Pentium Pro so 686 cpu's, PCem does emulate up to 586.
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omarsis81
Posts: 542
Joined: Thu 17 Dec, 2015 6:20 pm

Re: invalid opcode 0f44

Postby omarsis81 » Wed 06 Dec, 2017 5:24 pm

"PCem does emulate up to (a) 5x86" is a dangerous statement imo
the AMD 5x86 was introduced in November 1995, that would lead one's to think PCem doesn't have the Pentium 150 onward (those were launched in early 1996), let alone, the Pentium MMX in 1997
SarahWalker
Site Admin
Posts: 1325
Joined: Thu 24 Apr, 2014 4:18 pm

Re: invalid opcode 0f44

Postby SarahWalker » Wed 06 Dec, 2017 5:51 pm

Cyrix 6x86MX is the only CPU PCem emulates that supports CMOV.
szadycbr
Posts: 185
Joined: Mon 21 Nov, 2016 6:23 pm

Re: invalid opcode 0f44

Postby szadycbr » Wed 06 Dec, 2017 6:42 pm

It was dangerous statement, but i wasnt sure about 6x86MX :(

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