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Index > Compiler Internals > POP CS [BUG?]

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@L.chemist



Joined: 08 Oct 2004
Posts: 14
Location: Russia, Vladimir, Suzdal
@L.chemist
HI

according to AMD(Intel) manuals: POP CS has no opcode.
according to FASM: POP CS = 0x0F00.
???
Post 03 Feb 2006, 10:51
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7734
Location: Kraków, Poland
Tomasz Grysztar
8086 has "POP CS" = 0xF0. It was removed later (about 186? or 286?) and used as a prefix for extended opcodes instead. fasm includes the instructions for various Intel processors (like not-really-documented LOADALL286/LOADALL386) just in case you needed them.

Though if writing for 8086 in fasm you'd have to very careful with conditional jumps and shifts - I once made special header file for 8086 programming with fasm... where is it? Hmm...
Post 03 Feb 2006, 11:13
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@L.chemist



Joined: 08 Oct 2004
Posts: 14
Location: Russia, Vladimir, Suzdal
@L.chemist
Tomasz Grysztar wrote:
...I once made special header file for 8086 programming with fasm...

it was(is) good idea
Post 03 Feb 2006, 11:38
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MazeGen



Joined: 06 Oct 2003
Posts: 977
Location: Czechoslovakia
MazeGen
Tomasz Grysztar wrote:
8086 has "POP CS" = 0xF0. It was removed later (about 186? or 286?).

According to PHG's opcodes.lst file (can be found in Ralf Brown's package), POP CS works on non-CMOS 8086/8088.
BTW, there were a few versions of CMOS 8086 ("80C86"), but what actually means "CMOS 8086"?
Post 03 Feb 2006, 14:19
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