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@REPLYADDR Alexei A. Frounze
<alexfrunews@gmail.com>
@REPLYTO 2:5075/128 Alexei A. Frounze
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On Saturday, June 17, 2023 at 2:20:59 PM UTC-7,
muta...@gmail.com wrote:
> On Tuesday, June 6, 2023 at 5:47:34 PM UTC+8,
muta...@gmail.com wrote:
>
> > We have previously discussed laying out the PM16
> > selectors. And I remember we agreed that the code
> > selectors and data selectors needed to be
> > intermingled to provide a somewhat flat (ie not
> > really flat, more consecutive) address space.
> Here is one of the discussions:
>
>
https://groups.google.com/g/alt.os.development/c/0f3Ns-Q R4M/m/J 1X9yflAAAJ
>
> where I said that I needed two values - a divide value
> (of the amount being added) and a multiply (of how
> to manipulate the segment), but that both of these
> could potentially be shifts instead.
>
> Plus I found this, not sure if it is related:
>
>
http://www.delphigroups.info/2/ae/107069.html
>
> { AHincr is 8 in Standard and Enhanced mode, $1000 in real mode.
> AHshift is 3 in Standard and Enhanced mode, 12 in real mode
(2^AHshift=AHincr) }
>
>
> Regardless, it sounds to me like Microsoft found another
> way to skin the cat, presumably superior to my design, and
> that`s what their compiler is generating (as opposed to
> Watcom`s flexible design where I could have implemented
> my own manipulation), so there`s no particular reason why
> I wouldn`t just copy Microsoft on this.
>
> And since this code works on PM16 apparently, it may mean
> there is an existing call (Windows 3.1 or OS/2 1.0?) to get
> the AHINCR and AHSHIFT values.
>
> And it looks to me like that AHSHIFT of 3 was designed to
> manipulate selectors that contain consecutive data. I believe
> we previously said that my design required intermingled
> cs + ds, so the data selectors will be 0x10 apart, presumably
> meaning AHSHIFT of 4 instead of 3.
>
> Any idea if there are MSDOS or Windows or OS/2 calls to
> retrieve these 2 values?
>
> Thanks. Paul.
https://retrocomputing.stackexchange.com/questions/21559/
Alex
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