An Inexpensive Letter-Quality Printer

Tipologia Bibliografica

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Osservazioni: Photo 1: The Olivetti Praxis 30 electronic typewriter. (...) Table 1: The columns of this scan matrix are the bits ( and corresponding pins ) that are individually pulled low by Processor B for keyboard scanning. (...) Photo 2: Bottom view of the component side of the keyboard assembly. Processor A and B are identified. Photo 3: View of the printed-circuit side of the Praxis processor board. (...) Figure 1: The interconnection between an Intel 8255 parallel-port chip and the Praxis microprocessors. Figure 2: A flowchart of the controlling software as implemented in the C and Z80 assembler programs. Table 2: This table shows control character mapping. (...)

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