公开(公告)号：CA1128446A

公开(公告)日：1982-07-27

申请号：CA349752

申请日：1980-04-14

Applicant: IBM

Inventor： EVANS CHARLES W JR ,  HAYES RICHARD L ,  KANE MILBURN H III

IPC: B41J1/24 ,  B41J5/00

Abstract: APPARTUS FOR SYNCHRONIZING CARRIER SPEED AND PRINT CHARACTER SELECTION IN ON-THE-FLY PRINTING A rotatable print disk is mounted on a carrier which traverses along a print line. The disk is rotated from each selected character position to the next selected character position by the shortest distance at a constant velocity; thus, the time for the disk to move from a given selected character position to the next will be variable dependent on this distance. The carrier is moved from one print position to the next at variable speeds selected such that the carrier reaches the next print position in synchronization with the disk reaching the next selected character position. Upon such synchronization, a print hammer is fired to print the character while the carrier continues on-the-fly towards the next print position. The apparatus includes means responsive to the time required for the print disk to rotate from one selected character position to the next for controlling the carrier escapement velocity to increase and/or decrease such that escapement occurs coincident with character selection without escapement velocity becoming zero. AT9-78-031

公开(公告)号：CA1005922A

公开(公告)日：1977-02-22

申请号：CA183583

申请日：1973-10-17

Applicant: IBM

Inventor： ENGER THOMAS A ,  EVANS CHARLES W JR ,  JOHNSON LANCE H

IPC: G06F9/28 ,  G06F9/22 ,  G06F9/26

Abstract: A microprogram control subsystem discloses two control stores, one of which is accessed and utilized only on the first cycle of a microprogram sequence utilized to execute an information handling system instruction. A portion of the operation code of the system instruction is used to address the first-cycle control store to provide access to a microinstruction having fewer binary bits than normal microinstructions, and is effective to direct access to the remainder of the microprogram sequence contained in the other control store.