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Monster Media 1994 #1
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BBS_UTIL
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BM0406_A.ZIP
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EMS.DOC
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1994-04-06
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BusiMod(STUNY) (tm) mods and EMS
BM0406-x.ZIP
v2.5
PDS BASIC v7.1 allows the creation of overlay .EXE files which will use
available EMS memory or disk for swapping overlays in and out of memory.
If you have 512K available EMS memory (each window for DESQview users),
then the advantage to using the overlay method of linking is that you will
free up to 420K memory to shell to when running your TEST.BAT file, doors or
external protocols. (One beta tester was able to achieve this 420K mark..
the average amount of memory available is 270 - 320K)
Of course we never gain something without giving up something. In order to
utilize the EMS overlay version we must:
1. Have 512K EMS memory dedicated to RBBS in additon to the base 640K
2. You must set the READ ONLY attribute of the RBBS-PC.EXE file TO read
only if you wish to run multinode. If you fail to do this, you will get
the message to insert the disk containing RBBS-PC.EXE if more than one
node tries to access the .EXE at the same time. This can be done using
the ATTRIB.EXE command in DOS. The command line to set the attribute to
read only would be: ATTRIB +R RBBS-PC.EXE.
You must turn off the read only attribute if you wish to erase the file.
The command for this would be: ATTRIB -R RBBS-PC.EXE.
3. Slightly slower execution as the overlays are swapped in and out of memory.
On 386 class machines on up this won't be noticable. On slower 286 and
down machines, you may notice the program running slower. If you attempt
to run the overlay version of RBBS without sufficient EMS memory it will
turn a fast 486 into an IBM PC running at 4mhz! This is due to the time
involved in disk swapping.
If you decide you want to try the EMS version of RBBS, you need only run the
supplied EMS-286.BAT file to compile and link an EMS overlay .EXE. I have run
the EMS version for over 6 months with no problems and highly recommend it if
you have the available memory. It's nice to have the extra memory to shell to
for running SCAN, ZIPLAB, and other memory hungry programs without crashing or
using utilities like SHROOM.