Abstract: A print control device applicable to a printer or similar equipment and capable of maintaining the absolute printing amount of a cut sheet constant with no regard to the thickness and hardness of the sheet. A work RAM (Random Access Memory) stores various kinds of data and sheet size parameters received via an interface control. The work RAM has a line feed counter for counting the lines fed from the leading edge of a sheet in absolute value, and a sheet end counter for counting the lines fed after the end of the sheet has been detected. A CPU (Central Processing Unit) controls the printer in conformity to the programs stored in a control ROM (Read Only Memory) and determines the last line to be printed on the basis of the sheet size parameters and the outputs of the two counters of the work RAM.

Abstract: A serial printer control circuit having a motor control section which includes a single CPU, and a circuit which is controlled by the single CPU so as to perform printing in a period other than a acceleration/deceleration period of a spacing motor and perform paper feed by driving/controlling a line feed motor during a deceleration period of the spacing motor.

Abstract: An improved circuit for rotating an n.times.n dot-matrix through 90.degree. includes n latch circuits, each of which latches a column of the dot-matrix, and n output buffers, each of which is connected to the latch circuits susch that like-numbered bits of all matrix columns are forwarded to the same one output buffer.