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Computer Data Presentation by Display Unit

IP.com Disclosure Number: IPCOM000092871D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 72K

Publishing Venue

IBM

Related People

Laschenski, J: AUTHOR

Abstract

Maintenance requirements for large computers demand a fast visual presentation of the contents of internal registers and the status of control triggers of the system. Such a presentation for a large machine section, or for a group of consecutive words in storage, can be achieved in a very few seconds. Such is realized by a cathode ray tube display with a self-contained local storage having a number of permanent display formats. These are stored in the local storage. Scanning controls in the computer supply to the local storage the data to be inserted into the format. Storage 1 represents the storage area of the display unit and is divided into high and low storage sections.

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Computer Data Presentation by Display Unit

Maintenance requirements for large computers demand a fast visual presentation of the contents of internal registers and the status of control triggers of the system. Such a presentation for a large machine section, or for a group of consecutive words in storage, can be achieved in a very few seconds. Such is realized by a cathode ray tube display with a self-contained local storage having a number of permanent display formats. These are stored in the local storage. Scanning controls in the computer supply to the local storage the data to be inserted into the format. Storage 1 represents the storage area of the display unit and is divided into high and low storage sections.

The high storage contains a number of permanently stored formats containing titles, position data and transfer orders to low storage. The low storage is loadable from the computer and contains the transient data which is in blocks of a uniform length. As the heavy arrows indicate, after data is loaded, the start of a display cycle is from an address in high storage and first positions the CRT beam and then writes a title or the like, after which it transfers control to a fixed address in low storage. Starting at this address is a block of data, loaded from the computer, of the characters to be displayed for that area of the format, ending with a transfer address back to high storage for the next format data. This alteration of format from high storage and data from low storage continues until all data is presented. At this time the program transfers back to the start and the display is then regenerated continuously to present the stored information.

The loading of data into storage 1 is controlled by scanners in the CPU. Data is passed from data triggers through gating 2 which is set by word counter 3 to select 72 bit words or is passed from storage through a 72 bit storage bus 4. Either gate 5 is opened to pass register data to Or 11 or gate 6 is opened to pass storage data to CNSL BFR Reg 8. Byte selector 9 controlled by byte counter 10 selects one byte of 9 bits, 8 data, 1 parity, from the active one of either gate 5 or register 8, and transmits it through Or 11 to selector 12. The latter either gates the right or left four data bits to EBCDIC translator 13. This expands the four bits to the eight-bit code required by the display unit. The input parity bit is compared with a parity bit generated by parity tree 7. If the two bits do not compare, the EBCDIC code for an asterisk is placed in the data area immediately following the failing byte's data by format ring 18. The eight bits, plus the ninth parity bit, are gated out through gate 14 and Or 15 to storage 1.

A display is started by setting of display select switch 16 to select the one of the formats to be displayed and operation of the display pushbutton 17 which starts scan ri...