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- FDUMP FILE DUMP/PATCH UTILITY
- by Jon Dart
- Department of Anthropology, UCSD C-001, La Jolla, CA 92093
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- FDUMP is a file patch program I originally wrote to run on a Heath
- H89 under HDOS. The HDOS version is available from the San Diego Heath
- User's Group.
-
- FDUMP is largely self-prompting and most of what it does is
- obvious. I will give only a brief summary of the commands.
-
- The "A", "D", "H", and "O" commands will display a sector from a
- file in ASCII, decimal, hex, or octal. When displaying in ASCII, FDUMP
- will show control characters as "^A", etc. Any characters that have the
- parity bit set are shown as a ".".
-
- The "S" command is used to select another sector to look at or
- change. This command prompts for a relative sector number; sectors are
- numbered starting from 0 at the beginning of the file. Typing a "+"
- will read the next sector from the file into the buffer. Typing a "-"
- will read the previous sector.
-
- The "C" command is used to change bytes in a sector. You must give
- a number in hex that tells the program where in the sector you want to
- start changing things. Then, you will be asked whether you want to
- enter numbers in hex, decimal, octal, or ASCII. The program will show
- the old contents of each byte, and allow you to make changes in the
- format you have selected. One or more bytes can be entered on a single
- line, and will be stored in consecutive locations. In hex, decimal or
- octal mode, multiple bytes on a line should be separated by spaces. In
- ASCII mode, all characters typed on a line are stored, including spaces.
- When you are done changing, type Ctrl-C.
-
- Changes made with the "C" command only change the buffer where the
- contents of the sector are stored. To put the changed sector back on
- the disk, type "U".
-
- The "F" command will allow you to select a new file to look at or
- change.
-
- The "P" command will cause everything that is shown on the screen
- to be echoed on the LST: device, until another "P" command is given.
-
- The "L" command does a disk reset (roughly the same as typing ^C
- from the CP/M command level) and allows you to log in a new disk. If a
- file is open on the disk that you reset, it will be closed and you will
- prompted for a new file.
-
- The "W" command lets you create a new disk file that contains one
- or more sectors from the file you are examining. It will ask for a file
- name, which is the name of the new file you want to create, and for a
- list of sectors. You can type in a single sector number or a range of
- sectors (like "4-6").
-
- The X command will display the directory of the currently logged
- disk.
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- Typing Ctrl-D will exit from FDUMP and return to CP/M. Typing
- Ctrl-C will cancel whatever command is in progress and return to the "-
- >" command prompt.
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