Abstract: A programmable controller for executing a program having mixed instructions. The programmable controller includes a bit operation memory for storing a mixed instruction inclusive of the mixture of bit operation instructions and word operation instructions in order of execution and a word operation memory for storing the word operation instructions in the mixed instruction in order of execution. A bit operation processor is provided in the programmable controller for outputting a start command for a word operation instruction when a word operation instruction read from the bit operation memory subsequently to the execution of the bit operation instruction has been recognized.

Abstract: A CRT display unit provides for reduced electromagnetic radiation emission by encasing a video amplifier for amplifying image signals sent from a computer and a CRT device for displaying the amplified image signals within a chassis; coating conductive films on the external and internal surfaces of the funnel section of the CRT envelope; covering the circumference of the panel section with a metal rim band; fastening the envelope to the chassis via metal fixtures installed on the rim band; electrically connecting the conductive film coated on the external surface to the rim band by means of a first conductive member; and electrically connecting the space between the rim band on the panel section fastened to the chassis via metal fixtures and the chassis using a second conductive member.

Abstract: A magnetic bubble file system having a magnetic bubble memory includes magnetic bubble memory devices as memory media for constructing a plurality of pages of information store areas read and written by page. The store area of a selected one of the plurality of pages of the magnetic bubble memory devices is allotted to a write protection information store page for the magnetic bubble memory. The write protection information store page stores write protection information of each page of data store pages of the magnetic bubble memory. The magnetic bubble file system determines whether data can be written in to the data store page, in accordance with the write protection information stored in the write protection information store page.