OpenEuphoria

Re: Not too important asm beginner question.... (asm programming)

• Posted by Pete Eberlein <xseal at HARBORSIDE.COM> Apr 14, 1998
• 731 views

Eduardo Uemura Okada wrote:
> Once again, here is some more shoot: in your example to put a pixel on mode
> 13h, you used the 32-bit registers ebx, etc. Well, I read in some tutorial,
> that the 32-bit mode still allows 16-bit instructions, so I keep thinking
> (what a bore of beginner! - no, not exactly , I am using a little asm
> conversion utility asm2eu made by Alexander Yakovlev in the archive of
> EuPage, but it doesn't accept any 32-bit registers, so, without obj code for
> 32-bit, can I make a routine to manipulate sprites faster than in euphoria,
> but with 16-bit instructions?

Not with 16-bit.  I tried asm2eu with some simple 16-bit instructions.  My
machine crashed when I tried to execute the machine codes.  Protected mode
and 16-bit machine codes do not mix.  You need a 32-bit assembler to write
code that will work in protected mode.  16-bit instructions do work under
protected mode, but require a special prefix (#66) to indicate the word
size of the instruction.  A similar prefix (#67) is used to override
32-bit memory addressing.

I need to send my latest version of asm.e to the Recent Contributions
page.  asm.e compiles 32-bit code.  It doesn't have a separate
conversion program yet... I do my asm inline with strings.

I don't know when I will finish the tutorial... I made a link to what I
have so far on the tutorials section of my Euphoria site.

http://www.harborside.com/home/x/xseal/euphoria/

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