公开(公告)号：JPH04148257A

公开(公告)日：1992-05-21

申请号：JP27250790

申请日：1990-10-12

Applicant: IBM

Inventor： ARIGA NOBUO ,  SANO AKIRA ,  SHIRAISHI YUICHI

IPC: G06F12/14 ,  G06F21/24

Abstract: PURPOSE: To disable access from another information processor to a storage device even when the other information processor is connected to a standard interface part by providing a means for inhibiting access through the standard interface part to the storage device. CONSTITUTION: A 1st personal computer 21 is provided with a protect signal generating circuit 51 as a means for inhibiting access to a storage device 25. The protect signal generating circuit 51 has a password memory 52, key input latch 53 and comparator circuit 54 and a password key-inputted by a key input means 31 is held by the key input latch 53 and compared with a prescribed password, which is previously stored in the password memory 52, by the comparator circuit 54. When contents held in the key input latch 53 do not match stored contents in the password memory 52, the comparator circuit 54 generates a protect signal on its output line 55. Thus, even when the other information processor is connected to a standard interface part 26, the storage device 25 can not be accessed from the other information processor.

公开(公告)号：JPH075838A

公开(公告)日：1995-01-10

申请号：JP14731192

申请日：1992-06-08

Applicant: IBM

Inventor： TENJIN ATSUHIKO ,  ARIGA NOBUO

IPC: G02F1/133 ,  G09G3/20 ,  G09G3/36 ,  H04N5/66

Abstract: PURPOSE: To obtain a method for extending display data in which it is not necessary to use plural frequency clocks without deteriorating a processing speed by installing a circuit for generating the intermediate value of display data in a circuit for driving a dot matrix display device. CONSTITUTION: A dot matrix display panel is provided with plural signal electrodes (y)0 to (y)5 , and plural scanning electrodes crossing those signal electrodes (y)0 to (y)5 , and display dots are formed at the crossing positions of the signal electrodes (y)0 to (y)5 and the scanning electrodes. In a driving circuit, display data for one display line are successively shifted in a shift register 30, and impressed to the signal electrodes (y)0 to (y)5 . Then, at the time of driving at least one part of display lines, an intermediate value between the display data previously impressed to the signal electrodes (y)0 to (y)5 and display data newly arranging in the shift register 30 is generated, and the generated intermediate value is impressed to the signal electrodes (y)0 to (y)5 so that the display data are extended.