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Workstation Attachment for High Speed All-Points-Addressable Copier Process Printer

IP.com Disclosure Number: IPCOM000061184D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Hayes, GE: AUTHOR

Abstract

By time multiplexing an all-points-addressable (APA) hardware assist, used to support high function graphic displays, with the printer random-access memory (RAM) pel buffer, enhanced printer performance, lower system cost and greater fidelity of high speed printed images is obtained. Typical computer workstations use communications links, such as RS232, to attach the printer to the workstation. In this approach, the internal workstation data is converted into a serial link data stream, sent over the link, and transformed into printer-specific control actions. Limitations including a maximum transmission rate of 19.2K bits, time consuming encoding and decoding of workstation data and hardware-fixed (read-only store) printer decoding are found in such a communication link.

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Workstation Attachment for High Speed All-Points-Addressable Copier Process Printer

By time multiplexing an all-points-addressable (APA) hardware assist, used to support high function graphic displays, with the printer random-access memory (RAM) pel buffer, enhanced printer performance, lower system cost and greater fidelity of high speed printed images is obtained. Typical computer workstations use communications links, such as RS232, to attach the printer to the workstation. In this approach, the internal workstation data is converted into a serial link data stream, sent over the link, and transformed into printer-specific control actions. Limitations including a maximum transmission rate of 19.2K bits, time consuming encoding and decoding of workstation data and hardware-fixed (read-only store) printer decoding are found in such a communication link. Technological advances in the development of high function workstations often worsen printer attachment problems. These problems include: 1. High density APA devices are needed in order to present graphics and image density approaching 57.6K pels per square inch. 2. Higher requirements for image fidelity between displays and printers. 3. The desire for lower cost components. One approach to providing a cost competitive printer has been to use a copier process printer. This technology uses a standard photoconductor to transfer the bit-mapped or pel image onto a sheet of paper. Although this technique promises to pr...