Big old scanned manuals to small old scanned manuals

It is good that there are so many scanned manuals for old computer systems out there. Every old system did things its very own special way, and life’s too short to guess. I mean, there’s not much out there on the SYM-1 I’m trying to get working again:

— not much except for 6502.org’s excellent Synertek SYM-1 Resources, that is.

Some manuals, though, while lovingly scanned, are just too large to download, browse or file. Take, for instance, AppleIIScans’ Apple II BASIC Programming With ProDOS. It’s a very faithful colour scan, but at 170 MB for 280 pages, it’s a bit unwieldy. I suspect it’s Adobe Acrobat Paper Capture’s fault: while it makes turning scans into readable files really easy, it doesn’t warn against using 600 dpi full colour for a book with only decorative use of colour.

Good old Ghostscript saves the day, though:

gs -sDEVICE=pdfwrite -sColorConversionStrategy=Gray -dProcessColorModel=/DeviceGray -dPDFSETTINGS=/ebook -dNOPAUSE -dBATCH -dSAFER -q -sOutputFile=1983-A2L2013-m-a2-bpwp-grey.pdf -- 1983-A2L2013-m-a2-bpwp.pdf

By downsampling the scanned images and converting everything to greyscale, the result’s only 16 MB. All text and indexing from Acrobat is left intact.

gpiozero is rather good

gpiozero (‘A simple interface to GPIO devices with Raspberry Pi’) continues to impress me. One of its newer features is a pinout guide, accessed by the pinout command:

Raspberry Pi Zero pinout – click through for PDF

I’m trying to resist running it on every generation of Raspberry Pi that I have (B, A, 2B, 3B, Zero, Zero W) just for these pretty displays.

(ANSI console colours captured using script, then fed through ansi2html [from the Ubuntu colorized-logs package], printed to PDF from Firefox then mucked about a bit with in Inkscape)

You may think you’re cool, but you’ll never be playing-tuba-and-fiddle-simultaneously cool

You may think you’re cool, but you’ll never be playing-tuba-and-fiddle-simultaneously cool

You may think you’re cool, but you’ll never be playing-tuba-and-fiddle-simultaneously cool

Instagram filter used: Normal

View in Instagram ⇒

inky phat draws a design

A bit dusty, and no sound, but worked out pretty well. (YouTube link if embed doesn’t work — inky phat draws a design)

Tiling based on plate 43, “a rotating motif …”, Wilson, Eva. Islamic designs for artists and craftspeople. New York: Dover Publications, 1988. ISBN: 978-0-486-25819-5

two-colour EPD displays are so pretty …

rotating tile pattern on Pimoroni Inky pHAT EPD display

This is a 600 dpi scan of a Pimoroni Inky pHAT EPD display. EPDs — electrophoretic displays, aka ‘e-ink’ or ‘e-paper’ — retain their image when turned off, so this Raspberry Pi had no power when I scanned it.

The image I made to fit the display is really small —

It’s a bit of a process making the images with just the right palette in GIMP, but I’m pleased how it turned out. I’d like to be able to write the vector images directly to the screen from SVG, but that might take some time.

InkyPhat-rotating2-212x104-web.svg
Tiling based on plate 43, “a rotating motif …”, Wilson, Eva. Islamic designs for artists and craftspeople. New York: Dover Publications, 1988. ISBN: 978-0-486-25819-5