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"