| 摘要 |
A data processing apparatus includes a first image signal generating source for sending a first image signal to a printer unit for printing the first image signal; a second image signal generating source for generating a second image signal different from the first image signal, the first image signal generating source being connectable to the second image signal generating source and having a combined image signal output mode for outputting a combined signal of the first and second image signals to the printer unit; and an inhibition unit for inhibiting a change from the combined image signal output mode to another image signal output mode while the printer unit is operating.
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