1.7 KiB
Gidubba
Gidubba (Sumerian for 'stylus') is a simple line editor for the Thingamajig computer architecture. Its git repository can be found at https://ahti.space/git/crazyettin/Gidubba and that of Thingamajig at https://ahti.space/git/crazyettin/Thingamajig.
System requirements
Gidubba requires a terminal with local echo at address FFFF, and optionally a line printer at address FFFE and a punched tape reader and punch or a casette drive at FFFD. If your setup differs from this you have to modify the code yourself.
Usage
The commands are individual letters that can be followed by one or two arguments separated by a comma, all case-insensitive. The first argument is a line number between 0 and FFFF and the second a range of lines between 0 and FF. To append lines, insert them to any line number after the text or to the shortcut hash (#); in other commands line numbers or parts of a range after the text are ignored. Instead of a predetermined range a prompt to insert the next line appears automatically after the previous one has been committed.
Commands with a single argument:
- I: Insert lines
Commands with two arguments:
- D: Delete lines
- L: List lines
Commands with no arguments:
- P: Print
- R: Read from the tape reader or casette drive
- W: Write to the tape punch or casette drive
A delete (^?) discards the preceding character if any and outputs an underscore to the terminal. An escape (^[) discards the current command or line and gives a prompt for retyping it. An end-of-file (^Z) discards the current command and halts the computer or discards the current line and returns to the command prompt.