80 lines
3.1 KiB
Markdown
80 lines
3.1 KiB
Markdown
Gidubba v1.1
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============
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Gidubba (Sumerian for 'stylus') v1.1 is a simple line editor for the
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Thingamajig v2.x computer architecture. Its git repository can be found
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at 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 at least 4 KiB of RAM. It uses an ASCII-compatible
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terminal with local echo at address FFFF, and optionally a character
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printer at address FFFE and a paper tape reader and punch or a cassette
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deck at FFFD. Do not be afraid to modify the code yourself if your setup
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requires it! (And if you do, apologies for the spaghetti.)
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Format
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------
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Texts are terminated by an end-of-file (^Z) and lines within them by a
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newline of a carriage return (^M) followed by a line feed (^J) (CRLF).
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Gidubba is able to read texts without an end-of-file or with different
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newline formatting (CR, LF, or LFCR) and convert them to its native
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format. The characters null (^@) and FF are reserved for indicating tape
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leaders and trailers and an empty tape reader respectively and cannot
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occur within a text. Note that the input buffer can store at most 256
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characters, including the newline.
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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, all case-insensitive. The first argument
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is a line number between 0 and FFFF and the second a range of lines
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between 0 and FF. To append lines, insert them or set the mark to any
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line number after the text or to the shortcut hash (#); in other
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commands line numbers or parts of a range after the text are ignored and
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a hash is not recognised as a valid argument. Instead of a predetermined
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range a prompt to insert the next line appears automatically after the
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previous one has been committed.
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Commands with a single argument:
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* I: Insert lines
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* M: Set the mark
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Commands with two arguments:
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* C: Copy to the mark
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* D: Delete lines
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* L: List lines
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Commands with no arguments:
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* P: Print
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* R: Read from the tape reader or cassette deck
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* W: Write to the tape punch or cassette deck
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A delete (^?) discards the preceding character and outputs an underscore
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to the terminal. An escape (^[) discards the contents of the current
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command or line and outputs a backslash and a newline to the terminal. A
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carriage return (^M) or a line feed (^J) inputs a newline and commits
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the current command or line. An end-of-file (^Z) discards the current
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command and halts the computer or discards the current line and returns
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to the command prompt. At the end of the input buffer any input other
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than those described in this paragraph is ignored and an underscore is
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output to the terminal.
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There are two kinds of error messages: a question mark (?) for an
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erroneous command and an exclamation mark (!) for lack of RAM.
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Changelog
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---------
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v1.1
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* Upgraded for Thingamajig v2.x architecture
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* Disallowed the use of characters null (^@) and FF in texts
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* Added the ability to read and convert non-native newline formats
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v1.0
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* Initial release
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