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- There are five 'versions' of the assembly source to switch the computer
- (x286,x386,x486) into protected mode.
-
- The only version that I know works correctly is PROT4.ASM
-
- Included is a compiled version of PROT4.ASM (prot4.com) and
- liting and cross-reference to boot.
- All it does is reverse the video to a very ugly color. Clear
- the screen (CLS) to get rid of it.
-
- PROT1.ASM
- This version was taken from the book...
- "Inside the 80286" by Ed Strauss ISBN 0-89303-582-3
-
- This version is targeted for 'burn in' into EPROMs.
- Never tried it, don't have EPROMs or EPROM burner.
-
- PROT2.ASM
- This version was taken from the same book as above.
- Unknown why it never worked.
-
- PROT3.ASM
- Incomplete listing of another method, ignore this file, but
- included because it contains useful macros.
-
- PROT4.ASM
- This is the ONLY working version. Unknown source.
-
- PROT5.ASM
- Same as PROT4.ASM except that the gating of address line 20
- is performed differently, and for some reason, does NOT work on
- 80286 processors (I don't know why this is so).
-
-
- If nothing else, this may provide an experimental base to learn more
- about protected mode programming.
- I do not claim that this will work on EVERY machine. It is largly
- experimental, although your machine shouldn't get 'wrecked'.
-
-
- ALSO!!!
-
- The absolutly best book to get is
- "Dr. Dobb's ToolBook of 80286/80386 Programming"
- by Phillip Robinson ISBN 0-934375-42-9
-
- This book has a PASCAL (!) source on going into protected mode.
- The file PROTM1.PAS is an excerpt of that text.
- (I would have the whole thing, but I did not finish typing it yet!)
-
- Or, you can get the source code to all the protected mode programs
- in the Dr Dobb's book by calling
- 1-800-533-4372
- 1-800-356-2002 (in CA)
- ask for item #54-2
-
- Send $20 (+ CA Sales tax if applicable) to
- M&T Books
- 501 Galveston Drive
- Redwood City, CA 94063
-
- Again, Item #54-2 (they take VISA/MC/AMEX with # and Exp Date)
- Checks payable to M&T Books
-
- Note that the source code includes protected mode interfaces for Windows,
- UNIX, OS/2 and MS-DOS. These programs range from the simple stuff to
- task management and exception handling. Also included is protected mode
- co-processor programming and i82786 graphics processor programming.
- It's a big book (700+ pages), highly recommended.
-
-