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DOS Conventional Memory

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by gemailhiot

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I have a pentium 150 Mhz computer running DOS 6.0 and Windows 3.1. I have been running Generic CADD on this computer for a long time, but all of a sudden, some graphics are showing out of memory.
The program settings have not changed.
What seems different is that on a "mem" display, I show only 155KB of upper memory available. Should that not be more like 384KB?
When I display the details of "mem" utilization, I don't see anything that does not belong.
At this time, my only option is to remove drivers, which changes the working environment for the client.
The HIMEM and EMM386 programs are the DOS ones, not the Windows ones.
EMM386 is also NOEMS setting.

any suggestion?

thanks

gilles mailhiot

4 replies

by thechas

My first thought is to remove the memory modules and clean the connectors on the motherboard and the memory modules.

You may be loosing some RAM when EMM386 tests the memory before configuring the upper RAM.

The next step, is to see what's using additional memory.

Use the 'mem' command too verify how much RAM DOS is using.
If all RAM is accounted for, use the /p or /d switches (program or debug) to get better details of what program is using the memory.

You might also want to run 'memmaker' and see if it can free up any memory.

Chas

by thechas

By the way, I have run Generic CADD in a DOS window on a W95 box.

You need to FULLY configure the DOS environment for GC to work, but it will.

If you are willing to upgrade to a Windows environment, Visual CADD from Tri-Tools
http://www.tritools.com/
is built on the same core as Generic CADD.

The feel and many commands are the same.

Chas

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