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- - MEMSCAN: Bit Mapped Graphics Memory Scanner -
- by
- Scott A. Mebust
-
- 1601 Belmont Avenue
- South Bend, IN. 46615
- (219) 234-8217
-
-
- NOTE: Program must be run on CGA video compatible machine
-
-
- This program is a utility for programmers and other curiosity seekers
- who wish to view their PC in a different way... a more visual way. Memscan
- allows the user to see inside the 1-meg of PC memory, in 8 kbyte chunks.
-
- The program is primarily intended for locating bit mapped graphics, like
- graphic font tables (i.e. $FA6E in IBM ROMS). Even so, it can be used as a
- tool for locating certain 'objects' in memory, like program data tables,
- stack areas, code areas, available ram, missing ram, etc.
-
- It is also interesting to note the striking likeness of some memory
- patterns to silicon chip patterns. Hey - heres an idea... recursive
- fractalized computer programs - DNA in code! Anyway...
-
- The program runs in CGA Hires 640x200 mode. It displays a 64x * 128y
- array of bytes (8 pixels per byte, 8 bits per byte), with the offset address
- of the byte increasing by 1 when the y coordinate changes by 1, and by 128
- when the x coordinate changes by 1. A lit pixel indicates a true bit.
-
- The following keys perform functions in the program -
-
- '0'..'9' : Segment = #000h (coarse tuning)
- 'a'..'f' : Segment = #000h
- '+' : Segment = Segment + 0200h (fine tuning)
- '-' : Segment = Segment - 0200h
- <ESC> : END PROGRAM
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-
-
-
- This program is just a preliminary release without source code. Source
- will be released when polished. Any mistakes or bugs are purely coincidental.
- Any useability is totally accidental. Any request for donations is laughable.
- Any commenting parties are laudable. Any copyright is unthinkable. And the
- source code is pretty much illegible... for now.
-
- Comments can be directed to the Indiana University ACCESS BBS (812) 335-7252
- c/o Scott Mebust.
-
-
-
- OTHER NOTES-
-
- Program is Hybrid Turbo Pascal and direct memory manipulation -
- The program only writes to graphics memory, and reads the full
- $00000 - $FFFFF range of PC memory
-
- The program displays system memory in a bit mapped graphic fashion -
- in a 64x*128y ($2000=8192= 8k bytes) visual array where each byte is
- represented by 8 consecutive horizontal pixels with the bit values
- 128, 64, 32, 16, 8, 4, 2, 1, left to right, respectively.
-