Notes about ibm

October 23, 2022 permalink

Area 5150 — mindbending IBM 8088 demo

Another from the recent boggling demoscene demos, here’s a bonkers one pulling off tricks on vintage IBM 8088 PC hardware that the 16-color CGA graphics adapter shouldn’t be capable of doing. Remember this is a computer setup from circa 1981!

My favorite part of these kind of demos is when the audience goes wild (well, relatively) for the breakdancing elephant animation, even more than for the psuedo-3D graphics and psychedelic color scanline gimmicks.


November 13, 2021 permalink

Open to Conversion

Screen shot from PCPaint in 4-color mode

Over on Tedium, a nostalgia bomb roundup of 10 image file formats that time forgot. I wouldn’t say that BMP or even TIFF are exactly forgotten, and VRML seems like the odd one out as a text-based markup language (but definitely in the zeitgeist this month with all of the nouveau metaverse talk), but many of these took me back to the good old days. Also I didn’t know that the Truevision TARGA hardware, remarkable for its time in the mid-1980s with millions of colors and alpha channel support, was an internal creation from AT&T (my dad worked for AT&T corporate back then, but all we got at home was the decidedly not-remarkable 2-color Hercules display on our AT&T 6300 PC). JPEG and GIF continue to dominate 30+ years later, but it’s interesting to see what could have been, if only some of these other systems jumped more heavily into file compression…

April 4, 2017 permalink

Ibm Punched Card Typography

Norbert Landsteiner wrote up a post about something that’s retro-technology-typography-nerdy beyond even my usual limits and understanding: a thorough explication and an interactive demo of how the late-1940s IBM 026 key punch (the typewriter keyboard/workstation machine that operators would use to poke the holes in the computer program punchcards of that era) was able to also print tiny human-readable letters and words at the top of the cards for easy reference.

Basically IBM encoded the alphabet and other special characters onto a clever postage stamp-sized print head that would run along the top of the punchcard, with wires to each “dot” enabling the printing of each encoded character in turn, effectively an early dot-matrix printer. (it’s not easy to see, but if you squint at the image you’ll see that the red dots form the “A” character, upside-down — you’ll see it more easily if you play with the demo and choose other characters)

IBM Punched Card Typography.

July 30, 2011 permalink

Ibm Selectric Turns 50

It’s the 50th anniversary on Sunday of the IBM Selectric, the typewriter that revolutionized modern office equipment. Removing those antiquated mechanical keys attached to individual type bars, the Selectric introduced the crazy golf ball thing seen above, rapidly rotating the correct letter into place before striking the paper (unlike older typewriters, the paper stayed put and the ball + ink ribbon moved). Users could even swap out their golf ball for one of many with a different font set, a feature now taken for granted with our magical computers.

Retro-sexy enough to be featured in the 1960 world of Mad Men (the model they use is somewhat anachronistic), solid enough to be Hunter S. Thompson’s preferred machine (his was red), but with enough geek cred to be used as an electromechanical computer terminal interface (six-bit character encoding!).

My office’s supply room still stocks some of these balls, even though I can’t imagine there are many typewriters left. I’d better go stock up.

(Via El Reg)