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The Ingram Content Group was formed, in 2009, when Ingram Lightning Group merged with Ingram Digital Group. Ingram Content Group's operating units are Ingram Book Company, Ingram International Inc., Ingram Library Services Inc., Ingram Publisher Services Inc., Ingram Periodicals Inc., Ingram Digital, Lightning Source Inc., Spring Arbor Distributors Inc., and Tennessee Book Company LLC.
Lightning Source is a printer and distributor of print-on-demand books. [1] The company is a business unit of Ingram Content Group. Originally incorporated in 1996 as Lightning Print Inc., the company is headquartered in La Vergne, Tennessee, United States. Its UK operations are based in Milton Keynes. They also have operations in Maurepas ...
HP-19C calculator HP-29C with AC-powered battery charger. The HP-19C and HP-29C were scientific/engineering pocket calculators made by Hewlett-Packard between 1977 and 1979. They were the most advanced and last models of the "20" family (compare HP-25) and included Continuous Memory (battery-backed CMOS memory) as a standard feature.
The Sinclair ZX Printer, a small spark printer for the ZX81 and ZX Spectrum computers. Spark printing is an obsolete form of computer printing and before that fax and chart recorder printing which uses a special paper coated with a conductive layer over a contrasting backing, originally black carbon over white paper but later aluminium over black paper.
Made in Japan, this was also the first calculator to use an LED display, the first hand-held calculator to use a single integrated circuit (then proclaimed as a "calculator on a chip"), the Mostek MK6010, and the first electronic calculator to run off replaceable batteries. Using four AA-size cells the LE-120A measures 4.9 by 2.8 by 0.9 inches ...
Qalculate! supports common mathematical functions and operations, multiple bases, autocompletion, complex numbers, infinite numbers, arrays and matrices, variables, mathematical and physical constants, user-defined functions, symbolic derivation and integration, solving of equations involving unknowns, uncertainty propagation using interval arithmetic, plotting using Gnuplot, unit and currency ...
Perhaps the HP-42S was to be released as a replacement for the aging HP-41 series as it is designed to be compatible with all programs written for the HP-41. Since it lacked expandability, and lacked any real I/O ability, both key features of the HP-41 series, it was marketed as an HP-15C replacement.
In addition to software and support from HP, an active user community supported the HP-67/97 as well as the other HP programmables of the era. The group was called PPC and produced the PPC Journal . One of the notable contributions of the group was the development of a "Blackbox" that allowed pseudo-alphanumeric displays.