公开(公告)号：US3546537A

公开(公告)日：1970-12-08

申请号：US3546537D

申请日：1968-06-14

Applicant: IBM

Inventor： JUMP WILLIAM L ,  QUANSTROM JACK L

IPC: H02H3/253 ,  H02H3/24 ,  H01H47/18

CPC classification number: H02H3/253

公开(公告)号：CA974648A

公开(公告)日：1975-09-16

申请号：CA138128

申请日：1972-03-27

Applicant: IBM

Inventor： BELET JOSEPH J ,  QUANSTROM JACK L

IPC: H03M1/00

Abstract: Bipolar analog input signals are tested for apparent polarity, and depending on the polarity indication, the analog signal is either inverted or not inverted and resulting input signal is combined with a constant reference voltage so that the effective input to the analog-to-digital converter will always be a unipolar voltage having a minimum nominal value greater than the potential error of the polarity decision element. A counter or register type output device, which reflects the digital resultant from the conversion, is corrected by subtracting the digital equivalent of the constant reference voltage, either by presetting the counter to an initial negative value or by subtraction following the conversion. The initial polarity decision further controls the readout, either direct or complemented, to correspond to the apparent polarity of the input signal.

公开(公告)号：CA1199416A

公开(公告)日：1986-01-14

申请号：CA440692

申请日：1983-11-08

Applicant: IBM

Inventor： KELLEY RICHARD A ,  KURTZ HOBART L ,  MAGRISSO ISRAEL B ,  QUANSTROM JACK L

IPC: G06F13/37 ,  G06F13/14 ,  G06F13/20

Abstract: An arbitration technique is described for use in conjunction with a parallel bus structure. Essentially, it involves the use of a Request signal instead of an Acknowledge signal as the propagated polling signal and making use of the delay elements in each bus unit, which act in parallel with poll propagation and with each other to reduce the net poll propagation time. Making use of the Request signal allows initiation of arbitration prior to the activation time of the Acknowledge line.

公开(公告)号：BR8306942A

公开(公告)日：1984-07-24

申请号：BR8306942

申请日：1983-12-18

Applicant: IBM

Inventor： KELLEY RICHARD A ,  KURTZ HOBART L ,  MAGRISSO ISRAEL B ,  QUANSTROM JACK L

IPC: G06F13/37 ,  G06F15/16 ,  G06F9/46