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Using Multiple CPU Cores in DOS? (Miscellaneous)

posted by bretjohn(R) Homepage E-mail, Rio Rancho, NM, 16.09.2011, 18:06

I will have some time to mess with this over the weekend, and will let you know what happens.

I have looked over the code a little bit in the meantime. Based on what I see in the code and comments, it looks like the speed issues with INT 15.87 from RM may be more related to fiddling with the A20 line, and not the time it takes to switch CPU modes like I though it was. Is that correct?

If so, would it be possible to "patch" this with HIMEM? 95% of what you need is already there. HIMMEM even already traps INT 15.87, but just messes with A20 and lets the BIOS do the actual copying. If neither of the two addresses is in the HMA (or maybe even if they are), couldn't HIMEM just do the copy (hopefully much quicker than the BIOS does) and leave the BIOS out of it completely?

 

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