PETSCII mapping?

Rebecca Bettencourt beckiergb at
Wed Apr 5 15:35:45 CDT 2017

You can find charts of complete PETSCII character sets here:

The missing characters are a handful of block elements: upper fractional
blocks (Unicode only has lower), halves of MEDIUM SHADE, checkerboards and

I can put together a unified chart, with mappings to Unicode where they
exist. In fact I think I'll do that. :)

I'm all willing to help put together a proposal for encoding missing block
element characters, but I would need other people to a) gather evidence of
use in plain text and b) write up the proposal in Unicode's formal language
since I've never proposed characters to Unicode before.

(Additionally, I wonder if we could find evidence of the Apple II's or
TRS-80's characters in use in plain text as well. Not necessarily saying
those should be encoded as well, just that we should investigate.)

-- Rebecca Bettencourt

On Wed, Apr 5, 2017 at 12:47 PM, Murray Sargent <
murrays at> wrote:

> What PETSCII characters aren’t already in Unicode? A couple geometric
> symbols? Looks mostly like a simple codepage translation.
> Murray
> *From:* Unicode [mailto:unicode-bounces at] * On Behalf Of *Rebecca
> Bettencourt
> *Sent:* Wednesday, April 5, 2017 9:42 AM
> *To:* Asmus Freytag <asmusf at>
> *Cc:* unicode <unicode at>
> *Subject:* Re: PETSCII mapping?
> On Wed, Apr 5, 2017 at 3:18 AM, Asmus Freytag <asmusf at>
> wrote:
> Unicode is not an archive of anything ever used on computers.
> Why not? Isn't one of Unicode's goals to support the conversion of
> documents using legacy character sets into Unicode? I do not understand
> why, say, the entire IBM PC character set is eligible for encoding, but not
> the entire Commodore 64 character set.
> Were there word processors on the Commodore 64 that allowed the input of
> PETSCII characters? Could documents written using that software demonstrate
> a need to encode those characters? What about instruction manuals, magazine
> articles, and program listings that used PETSCII characters in running
> text? Surely there must be more than enough examples for a computer as
> popular as the Commodore 64.
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