For network engineers - IP CIDR and dot-decimal grid

This one is strictly for the network engineers. Noting the simple pattern in network masks, I sketched a grid to simplify the conversion of IP notation between dotted-decimal and CIDR notation, eliminating the need for a tedious CIDR listing of all 32 possibilities.

The dimensions are that of a US dollar, so it can be printed into a convenient wallet size.

Let me know if you find this useful.

Coleco games of yore

I loved electronic games back in the 80s; nothing was more engrossing than the small frames of blinking diodes that passed for state-of-the-art back then.

From my Frogger game (yes, still in the box!) came this folded catalog.  I scanned this one (click for full size); many more such scans can be found at the Electronic Handheld Game museum.