Bob, > On 5/30/2025 4:58 AM, Bernd Böckmann via Freedos-devel wrote: >> I finally got my hands on a machine that shows the symptom of BDA 40:96 >> getting changed, and I was able to identify the problem. >> > When the PC starts, BDA 40:96 is initially zero. As soon as the users >> > enters some specific keys (like the arrow keys), the value at 40:96 >> > changes to 0x10. So the BIOS seems to do some keyboard auto detection.
> Sorry to intrude on this technical discussion, but an open source PM debugger > such as 386SWAT can trivially be set to detect reads and/or writes to any > location such as 40:96. Set it to detect writes, and it pops up exactly when > they happen. Can it also be set when this writes does NOT happen? > It can be loaded from CONFIG.SYS. Perhaps the events you want to trap appear > before CONFIG.SYS is processed, in which case this tool won't help. > Otherwise, it can be very helpful. > I realize that you might not consider 386SWAT to be an acceptable addition to > FreeDOS, but that doesn't mean you can't use it solely for debugging > situations such as this. 386SWAT is probably absolutely fine. However when it appeared I had already 10+ years of experience with S-ICE. So I never changed my favorite debugger. Tom _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
