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86Box setup (Users)

posted by ecm Homepage E-mail, Düsseldorf, Germany, 04.02.2024, 22:05

> > For completeness: FDISK also hangs in LBA mode when running under the
> EDR
> > kernel.
> >
> > I will try to debug the INT 13 call FDISK does with ldebug, by setting a
> > breakpoint to C800:145B.
>
> I set up a conditional break point under lDebug with
> bp new c800:145b when=ah==41
>
> Sadly it can not set the breakpoint into the ROM because, well, its
> read-only. I can set the breakpoint to the EDR INT13 stub, but is there
> perhaps another way around this?
No, using the stub is the way to go. If there is no stub (eg debugging before DOS installs its handler, or if a DOS does not have such a stub at all) then you can create a small handler like this:

a 0:5E0
 jmp (ri13s):(ri13o)
 .
r v0 = ri13p ; preserve if to reset
r dword [0:13 * 4] = 5E0
bp new ptr ri13p when AH == 41

---
l

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