The Unofficial CP/M Web site uses some very old file formats. As almost no-one can easily run Amí 3 to read the manuals these days, here are the CP/M 3.1 manuals from that site converted to PDF:
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.
I was struck last week by the realization that I hadn’t done long division in decades. When the Casio FX (can’t remember which; it was small and solar) hit my life, the need to do long division vanished. So it’s probably around 30 years since I last had to do it.
My first attempts to remember how were dismal. Then I remembered the whole bit about “bringing down the units”, and it all clicked. I made the following animation to show how I did it:
This might be a slightly odd way of doing it, but it’s the way we were taught.
Talk about displacement activity: in the week or so before selling the house and upping and off to Canada, I scanned and converted the Weston Master V Exposure Meter and Invercone Instruction Book to HTML.