INT 21 - Turbo Debug HARDWARE BREAKPOINTS - READ STATUS BLOCK                   
	AH = 3Fh
	BX = handle for character device "TDHDEBUG"
	CX = number of bytes to read
	DS:DX -> buffer for status block (see #01406)
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (05h,06h) (see #01680 at AH=59h/BX=0000h)
SeeAlso: AH=40h"Turbo Debug"


(Table 01405)
Values for status of Turbo Debugger command:
 00h	successful
 01h	invalid handle
 02h	no more breakpoints available
 03h	hardware does not support specified breakpoint type
 04h	previous command prevents execution
 05h	debugger hardware not found
 06h	hardware failure
 07h	invalid command
 08h	driver not initialized yet
 FEh	recursive entry (hardware breakpoint inside hw bp handler)


Format of Turbo Debugger status block:
Offset	Size	Description	(Table 01406)
 00h	BYTE	status of command (see #01405)
---status for command 01h---
 01h	WORD	device driver interface version number (currently 1)
 03h	WORD	device driver software version
 05h	BYTE	maximum simultaneous hardware breakpoints
 06h	BYTE	configuration bits (see #01407)
 07h	BYTE	supported breakpoint types (see #01408)
 08h	WORD	supported addressing match modes (see #01409)
 0Ah	WORD	supported data matches (see #01410)
 0Ch	BYTE	maximum data match length (01h, 02h, or 04h)
 0Dh	WORD	size of onboard memory (in KB)
 0Fh	WORD	maximum number of trace-back events
 11h	WORD	hardware breakpoint enable byte address segment (0000h if not
		  supported)
---status for command 04h---
 01h	BYTE	handle to use when referring to the just-set breakpoint


Bitfields for Turbo Debugger configuration bits:
Bit(s)	Description	(Table 01407)
 0	CPU(Central Processing Unit) The microprocessor which executes programs on your computer. and DMAsee Direct Memory Access accesses are distinct
 1	can detect DMAsee Direct Memory Access transfers
 2	supports data mask
 3	hardware pass counter on breakpoints
 4	can match on data as well as addresses


Bitfields for Turbo Debugger supported breakpoint types:
Bit(s)	Description	(Table 01408)
 0	memory read
 1	memory write
 2	memory read/write
 3	I/O read
 4	I/O write
 5	I/O read/write
 6	instruction fetch


Bitfields for Turbo Debugger supported addressing match modes:
Bit(s)	Description	(Table 01409)
 0	any address
 1	equal to test value
 2	not equal
 3	above test value
 4	below test value
 5	below or equal
 6	above or equal
 7	within range
 8	outside range


Bitfields for Turbo Debugger supported data matches:
Bit(s)	Description	(Table 01410)
 0	any data
 1	equal to test value
 2	not equal
 3	above test value
 4	below test value
 5	below or equal
 6	above or equal
 7	within range
 8	outside range