3.4 File manager
As its name suggests, this application is used for managing files on the disk.
The “disk” on U4B is implemented as a FAT12-ish file structure on the 128K I2C EEPROM chip.
There are 1024 blocks, each of which is 128 bytes long. A program that is longer than 128K is
stored in multiple blocks. Normally these would be consecutive blocks but in case a large enough
consecutive memory area is not available for the size of the file being saved, it will be split into
smaller pieces that are spread around the disk and later re-assembled.
The following keys can be used in File manager:
F:
Create a new file – you will be prompted for the file name
E:
Open the file in the text editor for editing
V:
Open the file in the text editor for viewing (read-only)
R:
Rename a file – you will be prompted for the new file name
D:
Create a new directory – you will be prompted for the directory name
DEL:
Delete the file or directory. If deleting a directory, the directory must be empty first.
Enter:
Move down into the highlighted sub-directory (listed near the top of the file listing)
or into the parent directory which is indicated by the .. right at the top of the file
listing, if you have highlighted this .. pair of characters.
Ctrl-C:
Copy a file into memory
Ctrl-X:
Cut a file – this is like copying, then deleting
Ctrl-V:
Paste the file that was previously copied or cut; you will be prompted for the file
name
Ctrl-Q:
Quit the File manager application
Ctrl-D:
Open the Disk manager
The top row of the window shows the current directory location. In this example it is just / which
means the root directory. The second line shows the column heading; the third row always
shows .. which allows the operator to highlight this and press Enter to move to the parent
U4B operating manual Rev 1.00
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