Re: uniplus disks imaged

From: James MacPhail <gg__at_email.domain.hidden>
Date: Thu, 20 Mar 2008 15:56:20 -0700

>My emulation is based on IDEfile that is a bit more accurate than
>Xprofile... Idefile doesn't need a patch for Xenix for example...

FWIW, the major issue here is speed.

The Xenix driver has a poorly written interrupt handler; the bug doesn't appear with slower drives such as the original Apple ProFile, but the X/ProFile responds much more quickly, which causes the bug to appear.

The X/ProFile firmware could be adjusted to make the patches unnecessary, but that makes it noticably slower. Since only Xenix is affected, the patch seemed to be the best solution.


James MacPhail                   "Think not of engineering as art,
uo957_at_email.domain.hidden                 but of art as engineering"
Sigma Seven Systems Ltd.
james_at_email.domain.hidden        <>

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