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Python codecs for CBM PETSCII and Screencode encodings

Project description

Introduction

The cbmcodecs2 package provides a number of encodings for handling text from Commodore 8-bit systems. Much of the credit for this package must go to Linus Walleij of Triad, as these codecs were built from his PETSCII to Unicode mappings which can be found at http://www.df.lth.se/~triad/krad/recode/petscii.html The screencodes codec was created by hand later and borrows from them.

This package is an updated fork of the original cbmcodecs package, which now seems unmaintained.

Installation

Easiest is to install the latest version directly from Pypi :

pip install cbmcodecs2

Usage

Currently there are four codecs defined for variations of the PETSCII encoding:

petscii_c64en_lc
The English version of the Commodore 64 mixed-case character set
petscii_c64en_uc
The English version of the Commodore 64 upper-case/graphics character set
petscii_vic20en_lc
The English version of the VIC-20 mixed-case character set
petscii_vic20en_uc
The English version of the VIC-20 upper-case/graphics character set

There are two codecs defined to handle the Screencode (POKE) encoding:

screencode_c64_lc
Mixed-case mapping to screencodes (POKE) used by the Commodore 64 and Vic20
screencode_c64_uc
Upper-case/graphics mapping to screencodes (POKE) used by the Commodore 64 and Vic20

Simply import the cbmcodecs2 package and you will then be able to use them as with any of the encodings from the standard library:

import cbmcodecs2


with open('file.seq', encoding='petscii_c64en_lc') as f:
    for line in f:
        print(line)

Python Version Note

Currently only Python 3 is supported (tested on 3.5+). May or may not work on older versions.

License

As with the original PETSCII to Unicode mapping files, the cbmcodecs2 package is Licensed under the GNU GPL Version 2, see the LICENSE.txt file for the full text.

Unicode symbols used

Aside from the regular alphanumerics and symbols, the unicode mapping uses the following unicode block drawing and other symbols to mimic a bunch of PETSCII characters:

£ π ✓ ← ↑ ─ │ ┌ ┐ └ ┘ ├ ┤ ┬ ┴ ┼ ╭ ╮ ╯ ╰ ╱ ╲ ╳ ▁ ▂ ▃ ▄ ▌ ▍ ▎ ▏ ▒ ▔ ▕ ▖ ▗ ▘ ▚ ▝ ○ ● ◤ ◥ ♠ ♣ ♥ ♦

Credits

Linus Walleij - Original C64 and VIC-20 mappings

Dan Johnson - Translation of C64 & VIC-20 mappings to python codecs

Irmen de Jong - Screencode mappings, bug fixes and unit tests. Updated to cbmcodecs2 package.

Project details


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This version

1.0

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