Hitachi, Ltd.

Hiroaki Kambayashi

Keiichi Nakane

Yasuyuki Okada

Seiji Kageyama

Yoshiaki Yamashita

Hiroyuki Kambara

In a printer controller which receives a command series containing a drawing command for instructing a drawing operation, and also a printing command for instructing a printing operation, the command series being transmitted from a host computer, there are employed a central processing unit and a memory unit, and a command buffer unit for storing the command series and a page buffer unit for storing plural pages of drawn dot image data are formed in the memory unit. The central process unit executes both a task process program for executing the drawing command and printing command as a drawing task and a printing task respectively, and a task control program for performing a task control for processing the respective tasks in this task process program. Further, a task control table for holding task control information is provided in the memory unit. The task control program performs a task control in accordance with a content of the task control table.

Method and apparatus for controlling printer

A display system operates to display characters, graphics and picture images in connection with a host computer in online mode in which character data is treated in the online display data form, and without connection of the host computer in offline mode in which character data is treated in the offline display form. Character data supplied for the online operation is converted into the offline display data form and stored for use in offline mode, or it is first stored and then converted when used in offline mode.

System for on-line and off-line display

Disclosed is a method for controlling a rotary memory device for recording information on a recording medium in the form of a track, in which method the respective areas, such as a count section, a key section and a data section, which constitute a record format in the form of a record, are stored in the respective sectors each having a fixed length.

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Sagamihara, Japan

Hiroaki Kambayashi