flat assembler
Message board for the users of flat assembler.

Index > Compiler Internals > POP CS [BUG?]

Author
Thread Post new topic Reply to topic
@L.chemist



Joined: 08 Oct 2004
Posts: 14
Location: Russia, Vladimir, Suzdal
@L.chemist 03 Feb 2006, 10:51
HI

according to AMD(Intel) manuals: POP CS has no opcode.
according to FASM: POP CS = 0x0F00.
???
Post 03 Feb 2006, 10:51
View user's profile Send private message Visit poster's website Reply with quote
Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 8356
Location: Kraków, Poland
Tomasz Grysztar 03 Feb 2006, 11:13
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
View user's profile Send private message Visit poster's website Reply with quote
@L.chemist



Joined: 08 Oct 2004
Posts: 14
Location: Russia, Vladimir, Suzdal
@L.chemist 03 Feb 2006, 11:38
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
View user's profile Send private message Visit poster's website Reply with quote
MazeGen



Joined: 06 Oct 2003
Posts: 977
Location: Czechoslovakia
MazeGen 03 Feb 2006, 14:19
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
View user's profile Send private message Visit poster's website Reply with quote
Display posts from previous:
Post new topic Reply to topic

Jump to:  


< Last Thread | Next Thread >
Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Copyright © 1999-2024, Tomasz Grysztar. Also on GitHub, YouTube.

Website powered by rwasa.