tom moody

Archive for the ‘animation – others’ Category

ibm mainframe computing bitcoin hash function (slowly)


This animated GIF comes from Ken Shirriff's blog. Shirriff used a vintage IBM mainframe computer to compute the cryptographic "hash" functions that are the basis of bitcoin mining:

The IBM 1401 can compute a double SHA-256 hash in 80 seconds. It requires about 3000 Watts of power, roughly the same as an oven or clothes dryer. A basic IBM 1401 system sold for $125,600, which is about a million dollars in 2015 dollars. On the other hand, today you can spend $50 and get a USB stick miner with a custom ASIC integrated circuit. This USB miner performs 3.6 billion hashes per second and uses about 4 watts.

Shirriff's also produced a Mandelbrot image on the mainframe. His photos of the hand-wired guts of the IBM 1401 are fascinating.

- tom moody

August 10th, 2015 at 8:09 am

Posted in animation - others

word dot com GIF (late '90s) -- enlarged


So-called "art" GIFs were around in the late '90s -- I used to see them on They were made mostly by graphic designers as opposed to self-identifying artistes. The above GIF came from there; the original was 102 x 128 pixels. I enlarged it to 400 x 400 using "nearest neighbor" resizing to preserve the sharp edges. Still, this is an incredibly small (19 kilobyte) GIF in terms of ecological impact, in case you are thinking about alternatives to binge-watching Mad Men. Not that you can look at this one for very long.

- tom moody

June 26th, 2015 at 10:25 am



hat tip pfifferking

- tom moody

June 25th, 2015 at 8:30 am

spiral drawing (animated)


remix of SeacrestCheadle animation of restaurant napkin drawing (in this version the spirals have mostly gone missing)

- tom moody

June 6th, 2015 at 1:20 pm


shadow pfifferking_shadow

hat tips photos and pfifferking

- tom moody

June 2nd, 2015 at 7:40 am



hat tip to eyelash

- tom moody

May 20th, 2015 at 5:07 am

gummy4, lblug



- tom moody

May 11th, 2015 at 9:02 am

ab ex pair


top: drawing with the post-Windows 7 "lifelike" MSPaint (note "crayon" texture)
bottom: collab. with SeacrestCheadle and OIE

- tom moody

April 29th, 2015 at 8:40 am



hat tips pfifferking and reneabythe

- tom moody

April 7th, 2015 at 7:34 am



modification of a GIF found on the Analogue Haven website

- tom moody

March 30th, 2015 at 10:17 am