44 lines
1.5 KiB
Markdown
44 lines
1.5 KiB
Markdown
Gidubba
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========
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Gidubba (Sumerian for 'stylus') is a simple line editor for the
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Thingamajig computer architecture. Its git repository can be found at
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https://ahti.space/git/crazyettin/Gidubba and that of Thingamajig at
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https://ahti.space/git/crazyettin/Thingamajig.
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System requirements
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-------------------
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Gidubba requires a terminal with local echo at address FFFF and
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optionally a line printer at address FFFE and a punched tape reader and
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punch at FFFD. If your setup differs from this you may have to modify
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the code yourself.
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Usage
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-----
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The commands are individual letters that can be followed by one or two
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arguments separated by a comma. The first argument is a target line
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number between 0 and FFFF and the second the range of lines between 0
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and FF the command affects. Inserting lines to a target that does not
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exist or the shortcut hash (#) appends them to the text; otherwise
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targets or parts of ranges that do not exist are ignored.
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Commands with a single argument:
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* I: Insert a line or lines
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Commands with two arguments:
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* D: Delete a line
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* L: List a line
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Commands with no argument:
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* P: Print
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* R: Read from the tape reader
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* W: Write to the tape punch
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* H: Halt
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Both commands and arguments are case-insensitive. In both the command
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prompt as well as when inserting lines sending an escape (^[) will allow
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retyping the line in question. To finish inserting lines send a
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substitute (^Z): the line on which this is done is not saved.
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