Dot-matrix printer with font cartridge unit

Details Dot-matrix printer with font cartridge unit Dot-matrix printer with font cartridge unit

1985-08-30

1987-04-28

Sewell, Paul T.

Typewriting machines

Including control of format and selection of type-face by...

400 70, 400121, 400692, 364519, 365 63, B41J 530

Patent

active

046609997

ABSTRACT:
A dot-matrix printer of the invention uses a font cartridge unit storing in advance character pattern data corresponding to characters other than standard characters. The font cartridge unit has a memory area divided into a plurality of page areas, and comprises memory groups consisting of ROMs and RAMs storing character pattern data in units of page areas. A CPU sets a predetermined page address in a page address register in the font cartridge unit when dot printing of characters other than standard characters is performed. The CPU reads out desired character pattern data from the page area of the memory group corresponding to the preset page address. The CPU recognizes that no ROM is mounted at a position corresponding to the page area when predetermined data cannot be read out from the ROM. The CPU writes the predetermined data in the predetermined page area, and thereafter, when the predetermined page area is accessed, if the predetermined data cannot be read out, the CPU determines that no RAM is mounted at a position corresponding to the page area.

REFERENCES:
patent: 4159541 (1979-06-01), Ward
patent: 4281938 (1981-08-01), Phillips
patent: 4388010 (1983-06-01), Mott
patent: 4452136 (1984-06-01), Boynton
Introduction to Microcomputers, by Adam Osborne, 1980, pp. 5-6, Osborne/McGraw-Hill, vol. 1, Basic Concepts, Second Edition.

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