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- The following came about because of some possible problems with
- the Z80DNZCM.LBR that I release a little while ago.
-
- THIS PATCH APPLIES TO ALL VDE266 USERS, not just those who have tried
- Z80DNZCM.LBR or the just release .ZRL for Z80DOS2.
-
- Did some digging into VDE266 and found that there is a serious bug in
- the code that is supposed to handle the BDOS errors, such as File R/O,
- disk R/O, DATA error. The following should take care of it.
-
- With VDE266.COM in memory, change the following locations to the numbers given
- (all in HEX). With a file patcher, the addresses are 100h less in the file
- itself.
-
- 29B8 <- CD
- 29B9 <- A7
- 29BA <- 29
-
- 3 bytes total. It will allow VDE266 to correctly restore the warm boot
- vector at 0 in memory. Before it was restoring it with what it
- originally pointed to! This only happened if the BDOS detected some kind
- of error and exited by doing a jump 0 or a jump to the BIOS warmboot entry.
-
-
- Gene Nolan
- C/O DHN* RCPM
- 215-623-4040
- 7/22/88