Initial commit

.gitignore

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+/*
+!/*.asm
+!/.gitignore
+!/license.md
+!/readme.md

license.md

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+MIT License
+===========
+
+Copyright (c) 2022
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

readme.md

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+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. The emulator implementation
+included in the Thingamajig repository is suitable. If your setup
+differs from this you may have to modify the code yourself.
+
+Usage
+-----
+
+The commands are individual letters that depending on the command can be
+followed by an argument. The argument can be either a hexadecimal line
+number between 0 and FFFF or a hash (#), a shortcut for line FFFF. An
+argument to a non-existent line will be interpreted as referring to the
+line number after the last line.
+
+Commands with an argument:
+  * I: Insert a line or lines
+  * D: Delete a line
+  * L: List a line
+
+Commands with no argument:
+  * P: Print (requires a printer)
+  * H: Halt
+
+Both commands and arguments are case-insensitive. In both the command
+prompt as well as when inserting lines sending an escape (^[) will allow
+retyping the line in question. To finish inserting lines send a
+substitute (^Z): the line on which this is done is not saved.