6600m00n@ucsbuxa.ucsb.edu (Steelworker) (01/18/91)
In article <26343@uflorida.cis.ufl.EDU> jdb@reef.cis.ufl.edu (Brian K. W. Hook) writes:
] I am pondering using Turbo Debugger in the 386 mode. Does anyone know the
] advantages of running this way? Does it use V86 or protected mode? If it
] uses protected mode, what happens to all my disk caches (i.e. does protected
] mode thrash all the XMS that I had allocated for caching, EMS, etc. for
] its own use since their were allocated in real modE?)
]
] Brian
Using td386 allows you to debug large programs. I use it to debug
a program that takes nearly all main memory, which is impossible using
just td. Td386 uses V86 mode, similar to how Qemm, 386max, and other
memory managers do. (note that td386 will not run from a V86
environment of those manegers.) It requires the driver td386.sys to
load. It uses XMS, EMS, or perhaps even extended memory.
Other advantages are:
More advanced hardware breakpoints. ( eg break on access to
a memory location)
Better trapping of exceptions(?) and better response in general.
Try it out, but it is not needed except for large programs.
Good luck,
Robert Blair
6600m00n@ucsbuxa.ucsb.edujwbirdsa@amc-gw.amc.com (James Birdsall) (01/24/91)
In article <1991Jan19.015022.20618@bronze.ucs.indiana.edu> rschmidt@copper.ucs.indiana.edu (roy schmidt) writes: >In article <26343@uflorida.cis.ufl.EDU> jdb@reef.cis.ufl.edu (Brian K. W. Hook) writes: >> >>I am pondering using Turbo Debugger in the 386 mode. Does anyone know the >>advantages of running this way? > >For advantages, read pp. 250-251 of the TD manual, or any other Borland >hype on their product. :-) One of the big advantages is being able to use some of the 386's hardware debugging support, such as break on (read/write/any) memory access, for a specific location or range of locations. TD in normal mode can do a check for memory changed, but 1) it only detects changes and worse, 2) it's done in software so it's miserably slow. Using the hardware support, it runs at essentially full speed. One of the things that I haven't seen mentioned much is that YOU DON'T HAVE TO BE RUNNING TD386 TO GET THIS! If you have the driver (tdh386.sys) installed, TD running in normal mode can access the hardware debugging stuff. I tried it for a lark one day, and lo and behold, it worked. This is TD 2.0 on an ordinary Compaq 386/20e. Furthermore, it coexists peacefully with NFS, which TD386 does not. -- James W. Birdsall WORK: jwbirdsa@amc.com {uunet,uw-coco}!amc-gw!jwbirdsa HOME: {uunet,uw-coco}!amc-gw!picarefy!jwbirdsa OTHER: 71261.1731@compuserve.com "The OS shouldn't die every time the controller drools on a sector." -- a sysop =========== "For it is the doom of men that they forget." -- Merlin ===========