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https://github.com/catseye/SixtyPical.git
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64 lines
1.9 KiB
Markdown
64 lines
1.9 KiB
Markdown
History of SixtyPical
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=====================
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0.8
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---
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* Explicit word literals prefixed with `word` token.
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* Can `copy` literals into user-defined destinations.
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* Fixed bug where loop variable wasn't being checked at end of `repeat` loop.
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* `buffer` and `pointer` types.
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* `copy ^` syntax to load the addr of a buffer into a pointer.
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* `copy []+y` syntax to read and write values to and from memory through a pointer.
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0.7
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---
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* User-defined `byte` locations can be given an initial value.
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* `word` type locations which can be defined and `copy`ed between.
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* Can `copy` directly from one user-defined `byte` location to another.
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0.6
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---
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* Added `routine` and `vector` types, and `copy` instruction.
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* Both routines and vectors can declare `inputs`, `outputs`, and `trashes`,
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and these must be compatible to assign a routine or vector to a vector.
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* Added `goto` (tail call) instruction, jumps to routine or through vector.
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* `call` can call a subroutine indirectly, via a vector.
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* Routine name is now shown in analysis error messages.
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0.5
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---
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* Added `byte table` type locations and indexed addressing (`+ x`, `+ y`).
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* Integer literals may be given in hexadecimal.
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* Line comments may be included in source code by prefixing them with `//`.
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0.4
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---
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* Added `repeat` loops to the language, which can repeat until a flag
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is set (or `not` set), or which can repeat `forever`.
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* `if not` inverts the sense of the test.
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* Added explicitly-addressed memory locations.
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0.3
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---
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* Added external routine declarations.
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* Added ability to compile to 6502 machine code and output a `PRG` file.
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0.2
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---
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A complete reboot of SixtyPical 0.1. The reference implementation was
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rewritten in Python. The language was much simplified. The aim was to get the
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analysis completely right before adding more sophisticated and useful features
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in future versions.
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0.1
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---
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Initial inspired-but-messy version implemented in Haskell.
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