16 Aug
2002
16 Aug
'02
5:12 p.m.
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?
Which monitor are you running? Also, what version? If running the RT11SJ or
RT11FB monitor, try RT11XM. Keep in mind that RT-11 is basically limited to
64k (IIRC), and has to do tricks to use more than that.
Zane
16 Aug
16 Aug
5:56 p.m.
----- Original Message -----
From: "Zane H. Healy" <healyzh(a)aracnet.com>
Which monitor are you running? Also, what version?
If running the RT11SJ
or
RT11FB monitor, try RT11XM. Keep in mind that RT-11
is basically limited
to
64k (IIRC), and has to do tricks to use more than
that.
I did indeed try RT11XM with the same results. I guess I was hoping that
there was some customization I needed to do to expand the amount of memory
allocated to user programs.
17 Aug
17 Aug
10:17 a.m.
> Which monitor are you running? Also, what
version? If running the
>RT11SJ or RT11FB monitor, try RT11XM. Keep in mind that RT-11 is
>basically limited to 64k (IIRC), and has to do tricks to use more than
>that.
The problem is that you actually have less memory available when you
run XM since it is a larger monitor. And we're talking about memory
in the critical area of the low 56kb.
I did indeed try RT11XM with the same results. I guess
I was hoping that
there was some customization I needed to do to expand the amount of
memory allocated to user programs.
What you need to do is try running the program under XM, but using
the 'virtual background executive' program, VBGEXE. This will
move the program into extended memory, but the program will see
much more available memory in its virtual address 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) |
| Hewlett Packard | (s/ at /@/) |
| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 (DEC '77-'98) | required." - mbg KB1FCA |
+--------------------------------+-------------------------------------+
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