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Eureka! I have found it! (but I didn't run down the street in my birthday suit
as did Archimedes.) After Anton's reply - see previous posting) I
did what I should have done first, that is start with the bare dos and add the
the extra bits in one at a time. To shorten a long story, the
offending module turned out to be Novell's Dos Protected Mode
Interface - DPMI. This module apparently is to allow multi-tasking, and is loaded
when EMM386 is loaded, and appears to be the default setup for NW-DOS.
The instability is present when DPMI is loaded, even when disabled
by using 'DPMI=OFF' on the command line, which disables DPMI but
leaves it loaded.
However, you can avoid loading it by putting 'DPMI=OFF' in Config.sys,
and then PB3.5 is quite stable.
Now, some figures on why I want to use NW-DOS over the 'other' dos.
NW-DOS makes much better use of memory for running programs in the
PB IDE, like so:
Under NW-DOS, the available memory for running programs in the PB IDE
is 276Kb, and with video memory switched in, a most useful 374Kb;
while under the 'other' dos, available memory is only 195Kb, with
no video memory available that I can find.
Now, all I need is to crack the F11/F12 problem in PBINST ...
Colin D.
as did Archimedes.) After Anton's reply - see previous posting) I
did what I should have done first, that is start with the bare dos and add the
the extra bits in one at a time. To shorten a long story, the
offending module turned out to be Novell's Dos Protected Mode
Interface - DPMI. This module apparently is to allow multi-tasking, and is loaded
when EMM386 is loaded, and appears to be the default setup for NW-DOS.
The instability is present when DPMI is loaded, even when disabled
by using 'DPMI=OFF' on the command line, which disables DPMI but
leaves it loaded.
However, you can avoid loading it by putting 'DPMI=OFF' in Config.sys,
and then PB3.5 is quite stable.
Now, some figures on why I want to use NW-DOS over the 'other' dos.
NW-DOS makes much better use of memory for running programs in the
PB IDE, like so:
Under NW-DOS, the available memory for running programs in the PB IDE
is 276Kb, and with video memory switched in, a most useful 374Kb;
while under the 'other' dos, available memory is only 195Kb, with
no video memory available that I can find.
Now, all I need is to crack the F11/F12 problem in PBINST ...
Colin D.
it appears that the decision was made in order to ensure compatibility on the widest range of hardware that PB/DOS can run on.
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