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NUCD.DOC
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1986-09-01
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2KB
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34 lines
TO: Sysops running NUBYE and who use Richard Conn's CD.COM program
ver. 2.3 to move from one named directory to another on
ZCPR2/ZCMDXX systems.
FROM: Joe Earls, Sysop of PC-FORUM, Columbus, GA 404-324-7391
DATE: August 4, 1986
PROB: System crashes and other unpredictable results when running the
CD program while NUBYE is running.
CAUSE: The CD program uses the BDOS pointer to calculate where the entry
point of ZCPR2 should be in memory, so that it can jump back into
it. However, when NUBYE is running it modifies the BDOS vector,
causing CD to jump into the wrong place and causing horrible
things to happen.
FIX: I have prepared a modified version of CD 2.3, which I have named
NUCD in order to avoid its confusion with the original. NUCD
obtains the address of ZCPR2 from a value you patch into the
NUCD.COM file, instead of trying to calculate it from the BDOS
vector. To use NUCD.COM you absolutely MUST patch in this
address.
I have supplied in the LBR the NUCD.COM program, ready for you
to patch in your ZCPR2 CCP address. I have also furnished the
NUCD.MAC and SYSLIB.REL source modules in case you wish to
make other changes and assemble your own.
When patching the NUCD.COM module, patch the address of the
beginning of your ZCPR2 CCP area into the following locations:
1AFH Lo byte of address
1B0H Hi byte of address
That's it. Don't forget to GENINS in your own install parameters
after you make the patch.