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Confusing DEBUG (Miscellaneous)

posted by Japheth(R) Homepage, Germany (South), 19.08.2010, 00:52

> On return, the G command of DEBUG just looks whether the current CS:(E)IP
> fits, i.e. points behind one of the breakpoints it set.

I don't think this is the correct description of what - at least - FD Debug does. It's more complicated. After G returned, it does:

- read the byte at CS:E/IP-1
- restore its BPs
- if the byte it has read is 0CCh AND entry into Debug was through interrupt 3, then it again reads the byte at CS:E/IP-1. If its value is NO LONGER 0CCh, then Debug assumes one of its BPs were hit and decrements E/IP.

---
MS-DOS forever!

 

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