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The Atari 400 and TRS-80 model I were officially only expandable to 16 KB, but expansion to 48 KB was available from third-party suppliers. The ZX81 and the other systems referred to as having "block" graphics have a resolution of 256 × 192 pixels, there are 32 columns × 22 rows of text and graphics can be addressed in quarter character blocks.
Pentair was founded in August 1966 as Pentair Industries, Inc., with the name derived from the Greek root word "penta-" (alluding to the company's five founders) and "air" (alluding to the company's original product), and went public several months later. [10] The 5 founders were all formally employed by Litton Industries. [11]