RT-11 Memory Issues

From: Megan <mbg_at_TheWorld.com>
Date: Sat Aug 17 10:30:00 2002

>I've finally got this old PDP-11/24 up and running. The system has 1 meg
>of RAM, but keeps giving insufficient memory errors when trying to run
>various programs (like ADVENT.) I can't believe that ADVENTure would eat
>up more than 1 megabyte of ram. Is there some tuning bit that I am
>missing here?

Unless the program has been designed to use extended memory overlays, or
specifically designed to use extended memory directives, it is limited to
the standard virtual memory address space of 56kb, minus whatever is used
by the monitor (and this is carved out of the low 56kb of the machine...
the rest of the 1mb is unused).

As I already mentioned in another post, you could try using VBGEXE
to run it in its own 56kb space.

                                        Megan Gentry
                                        Former RT-11 Developer

+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | email: gentry at zk3.dec.com (work) |
| Unix Support Engineering Group | mbg at world.std.com (home) |
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Received on Sat Aug 17 2002 - 10:30:00 BST

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