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Re: reprints of old AI memos (was Re: boxing all integers)f

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From Kragen Javier Sitaker <kragen@canonical.org>
Newsgroups alt.sys.pdp10
Subject Re: reprints of old AI memos (was Re: boxing all integers)f
Date Mon, 31 Aug 2026 13:56:35 -0300
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Kragen Javier Sitaker <kragen@canonical.org> writes:
> Is the BDF conversion lossy?  Glancing at the Python, it doesn’t appear
> to be thresholding grayscale or anything like that.

Upon taking what should have been the obvious step of looking at the
README file
<https://github.com/larsbrinkhoff/ai-memo-reprints/blob/master/README.md>
I see that XGP is the Xerox experimental XeroGraphic Printer — which
strongly implies that the fonts are bilevel, not grayscale, since
xerography is terrible at grayscale, even 50 years later.  But I am
pretty sure that the data in these PDF files is grayscale, having just
rendered it with pdf.js, mupdf, libpoppler, and GhostScript, and zoomed
way in in each one.

Perhaps this grayscale is a product of the “PDP-11 emulator running the
original XGP driver code” mentioned in the README, since presumably it
wasn’t controlling the original XGP hardware.  I wonder if TJ6 could be
hacked to output a .dvi-like list of (glyph, x, y) triples?  It would
probably make for PDF fies that were both more readable and more compact
(and therefore easier to archive).

Kragen

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boxing all integers (was Re: Resources to learn common lisp?) Kragen Javier Sitaker <kragen@canonical.org> - 2026-08-29 17:52 -0300
  Re: boxing all integers (was Re: Resources to learn common lisp?) Lars Brinkhoff <lars.spam@nocrew.org> - 2026-08-30 06:43 +0000
    Re: reprints of old AI memos (was Re: boxing all integers)f Kragen Javier Sitaker <kragen@canonical.org> - 2026-08-30 13:11 -0300
      Re: reprints of old AI memos (was Re: boxing all integers)f Lars Brinkhoff <lars.spam@nocrew.org> - 2026-08-31 05:14 +0000
        Re: reprints of old AI memos (was Re: boxing all integers) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-31 06:54 +0000
        Re: reprints of old AI memos (was Re: boxing all integers)f Kragen Javier Sitaker <kragen@canonical.org> - 2026-08-31 13:43 -0300
          Re: reprints of old AI memos (was Re: boxing all integers)f Kragen Javier Sitaker <kragen@canonical.org> - 2026-08-31 13:56 -0300
            Re: reprints of old AI memos (was Re: boxing all integers)f Paul Rubin <no.email@nospam.invalid> - 2026-08-31 13:34 -0700
              Re: reprints of old AI memos (was Re: boxing all integers)f Rich Alderson <news@alderson.users.panix.com> - 2026-08-31 18:12 -0400
                Re: reprints of old AI memos (was Re: boxing all integers)f scott@slp53.sl.home (Scott Lurndal) - 2026-09-01 15:12 +0000
            Re: reprints of old AI memos (was Re: boxing all integers)f Lars Brinkhoff <lars.spam@nocrew.org> - 2026-09-01 05:59 +0000
              Re: reprints of old AI memos (was Re: boxing all integers)f Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-02 15:23 -0300
          Re: reprints of old AI memos (was Re: boxing all integers) Lars Brinkhoff <lars.spam@nocrew.org> - 2026-09-01 05:45 +0000
            Re: reprints of old AI memos (was Re: boxing all integers) Lars Brinkhoff <lars.spam@nocrew.org> - 2026-09-01 07:07 +0000
            Re: reprints of old AI memos (was Re: boxing all integers) Rich Alderson <news@alderson.users.panix.com> - 2026-09-01 17:36 -0400
              the history of the Hershey fonts (was Re: reprints of old AI memos) Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-02 15:55 -0300
                Re: the history of the Hershey fonts (was Re: reprints of old AI memos) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-09-02 21:31 +0000
                Re: the history of the Hershey fonts (was Re: reprints of old AI memos) Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-03 09:59 -0300
            Re: reprints of old AI memos (was Re: boxing all integers) Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-02 16:35 -0300
              Re: reprints of old AI memos (was Re: boxing all integers) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-09-02 21:50 +0000
                PDF file compactness (was Re: reprints of old AI memos) Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-03 12:06 -0300
              Re: reprints of old AI memos (was Re: boxing all integers) Lars Brinkhoff <lars.spam@nocrew.org> - 2026-09-03 05:42 +0000
                Re: reprints of old AI memos (was Re: boxing all integers) Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-03 12:50 -0300
            origin of XGP fonts (was Re: reprints of old AI memos) Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-28 10:44 -0300
              Re: origin of XGP fonts (was Re: reprints of old AI memos) Peter Flass <Peter@Iron-Spring.com> - 2026-09-28 07:33 -0700
                Re: origin of XGP fonts (was Re: reprints of old AI memos) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-28 22:53 +0800
      Re: reprints of old AI memos (was Re: boxing all integers)f Lars Brinkhoff <lars.spam@nocrew.org> - 2026-09-06 08:40 +0000

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