Re: Re: [Nolug] December meeting

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On Tuesday 18 December 2001 12:27 pm, Jerald M. Sheets wrote:
> There' several types (so naturally, I may miss yours)
>
> There's graphic overlays for behind-the-scenes DOS functions.
> There's DB overlays in Clarion & dBase (same function, only in a
> database). There's cell animation overlays in the Disney animation
> software (like the old paper method). To which do you refer?

May be similar to xBase overlays. When running in x86 Small
mode, you, of course, only have 64KB to work with. If your
program+data is >64KB then you would have to split the code into
logical units. (Of course, this is good practise anyway...)
The main program section would pre-allocate a section of the
heap that was as big as the largest seperately compiled logical
unit (or sum of logical units, if more than 1 had to be loaded
at 1 time).

Then, you would explicitly load and unload program sections as
needed. Basically, you do your own paging.

Realia COBOL did something very similar, but allowed you to use
the whole 640KB. Now *that* had a fast compiler and RTL...

> -----Original Message-----
> From: owner-nolug@patientcarerx.com
> [mailto:owner-nolug@patientcarerx.com] On Behalf Of Ron Johnson
> Sent: Tuesday, December 18, 2001 12:01 PM
> To: nolug@patientcarerx.com
> Subject: Re:Re: [Nolug] December meeting
>
> On Tuesday 18 December 2001 11:28 am, anencephalous@juno.com wrote:
> > Heh, I do too have a mac -- I took my bonus from my last job and
> > got a powerbook. Grr. Unfortunately that was before they came
> > out with the combo DVD/CDRW drives. Still, I do have a box running
> > OSX, which I have been using pretty much exclusively for a few
> > weeks now, for compsci assignments and general stuff.
>
> CompSci on a Mac??? Wow. We only needed an XT. (And half the
> excersises could be done on my KayPro 2X.) You should have seen
> an AT chomp thru our (Turbo Pascal 3.0) assignments...
>
> Trivia question: Does anyone here (besides Joey) know what an
> overlay is?

- --
+------------------------------------------------------------+
| Ron Johnson, Jr. Home: ron.l.johnson@home.com |
| Jefferson, LA USA http://ronandheather.dhs.org:81 |
| |
! Thanks to the good people in Microsoft, a great deal of |
! the data that flows is dependent on one company. That is |
! not a healthy ecosystem. The issue is that creativity gets |
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! Mitchell Baker, "Chief Lizard Wrangler" at Mozilla |
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Received on 12/18/01