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Format of Turbo Debugger hardware breakpoint commands

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Offset Size Description

00h

BYTE

command code
00h - install interrupt vectors
01h - get hardware capabilities
02h - enable hardware breakpoints
03h - disable hardware breakpoints
04h - set hardware breakpoint
05h - clear hardware breakpoint
06h - set I/O base address and reset hardware
07h - restore interrupt vectors

---command code 00h---

01h

DWORD

pointer to Turbo Debugger entry point to be jumped to on hardware breakpoint; call with CPU state the same as on the breakpoint except for pushing AX and placing an entry code (FFh if breakout button or breakpoint handle) in AH

---command code 04h---

01h

BYTE

breakpoint type
00h - memory read
01h - memory write
02h - memory read/write
03h - I/O read
04h - I/O write
05h - I/O read/write
06h - instruction fetch

02h

BYTE

address matching mode (see #01419)

03h

DWORD

32-bit linear low address

07h

DWORD

32-bit linear high address

0Bh

WORD

pass count

0Dh

BYTE

data size (01h, 02h, or 04h)

0Eh

BYTE

source of matched bus cycle
01h - CPU
02h - DMA
03h - either

0Fh

BYTE

data-matching mode (see #01419)

10h

DWORD

low data value

14h

DWORD

high data value

18h

DWORD

data mask specifying which bits of the data are tested

---command code 05h---

01h

BYTE

handle of breakpoint to clear (breakpoint returned from command 04h)

---command code 06h---

01h

WORD

base address of hardware debugger board