Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Overcoming Forms Length Limitations in Line Printers

IP.com Disclosure Number: IPCOM000077699D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 90K

Publishing Venue

IBM

Related People

Brown, DE: AUTHOR

Abstract

This Program enables a line printer that normally can print a form of up to a preselected maximum length to print a form of greater length without requiring changes in the tape control mechanism, control tape or other hardware.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 58% of the total text.

Page 1 of 2

Overcoming Forms Length Limitations in Line Printers

This Program enables a line printer that normally can print a form of up to a preselected maximum length to print a form of greater length without requiring changes in the tape control mechanism, control tape or other hardware.

For example, an IBM 1403 Printer, printing at 8 print lines per inch, can normally print a form of not more than 16-1/2 inches because the maximum carriage control tape length is only 132 print lines. Assume a user desires to print an 18-inch long form (144 print lines at 8 lines per inch) without change of hardware.

The initial step is to create manually a carriage control tape that is an integral fraction of the 18-inch desired form length; e.g., 9 inches long (72 print lines). This control tape is primarily for the convenience of the operator in aligning the forms; but it can also improve speed in skipping operations.

This is followed by programming operations that can be a general purpose macro or in subroutine form, and can either perform all operations by spacing with no reference to the external control tape or perform skipping operations by referencing the external control tape. Performing all operations by spacing with no reference to the external tape has the disadvantage of reduced speed, but has the advantage of complete control tape independence; whereas referencing the external control tape for skipping operations has the advantage of little or no reduction in speed.

The ro...