초록 ▼

A Central Processing Unit (CPU) sends a parity command to each printer in a printing system including a plurality of printers and discriminates status data returned from the printers in response to the parity command to determine which printer is coupled to a printer interface and reads out a system

A Central Processing Unit (CPU) sends a parity command to each printer in a printing system including a plurality of printers and discriminates status data returned from the printers in response to the parity command to determine which printer is coupled to a printer interface and reads out a system program associated with the printer from a magnetic disk device. The CPU also causes a selector of the printer interface to select a dot clock signal for the printer presently coupled to the printer interface, reads out image data from a memory using this dot clock signal and sends the acquired data to the coupled printer.

대표청구항 ▼

An interface apparatus, comprising: first and second printer means for printing image data and outputting mutually different status data in response to an input operation command; connection means selectively coupled to one of said first and second printer means; memory means for storing said image

An interface apparatus, comprising: first and second printer means for printing image data and outputting mutually different status data in response to an input operation command; connection means selectively coupled to one of said first and second printer means; memory means for storing said image data; readout means for reading out said image data stored in said memory means and supplying said image data to said one of said first and second printer means; supply means for supplying an operation command to said one of said first and second printer means; and selection means for selecting a read timing of said readout means in accordance with said status data output from said one of said first and second printer means in response to said operation command. wherein said first printer means includes a first signal generator for generating a horizontal sync signal in synchronization with printing of said image data; said second printer means includes a second signal generator for generating a first read signal for reading out said image data in synchronization with printing of said image data; and said selection means includes a third signal generator for generating a second read signal in response to said horizontal sync signal from said first printer means, and a selection circuit for selecting said second read signal from said third signal generator when said first printer means is coupled to said connection means and for selecting said first read signal from said second signal generator when said second printer means is coupled to said connection means, in accordance with said status data from said one of said first and second printer means.