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- DUMP100.COM (which I call Q.COM) is a simple program to dump the first 100
- bytes of memory on a PC. It also shows the contents of the registers.
-
- The program is useful to see how PC-DOS formats filenames, or more generally,
- the command line, into the default File Control Blocks at 5ch and 6ch, and
- into the temporary buffer at 80h. Thus if you were wanting to write an
- assembler program to do some function, and wanted to know how the possible
- operands looked at 80h, and how invalid operands looked (like keying in the
- program name with no operands, or keying it in with a / then the operands (no
- space), you can see just how it looks.
-
- The register dump is also useful because it shows how much memory you have
- tied up in your system for device drivers, etc. For example, if you want to
- know how much room a new device driver taks, type in Q (or dump100 if you
- haven't renamed it), note the value of CS. Then load the device driver, (i.e.
- "dosedit" for example), then type Q again - the difference between the new CS
- and the old one is the number of paragraphs (16-byte chunks) the device driver
- took up.
-
- 09/22/84 by Ward Christensen