AVP 1 The catalogue was hidden by placing a VDU21 control code in the last character of the title string. This effectively disables VDU output. In addition the first file name was ![12][3]AVP[21]. The control codes cleared the screen, switched off printer output and disabled the VDU. Additionally the disk had only the first 20 tracks formatted, thus preventing *BACKUP. *COPY *.* was prevented by the control codes in the first file. DEFEATING |
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