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Character Attribute Control Method

IP.com Disclosure Number: IPCOM000061368D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 3 page(s) / 85K

Publishing Venue

IBM

Related People

Maezawa, Y: AUTHOR [+2]

Abstract

This article describes the new method, as shown in Fig. 2, which has two individual control blocks to save the current character attribute for each key and host, and a status flag of key to indicate that the character attribute has been requested by key. The conventional character attribute control method can not cause a character attribute requested by the key to differ from one by the host (communicated with a computer or a terminal) because it had only one control block to save the current character attribute for key and host, as shown in Fig. 1. The ASCII terminals, which use the conventional method, can not display entering characters on the screen with a character attribute which is the same as one that receiving characters have.

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Character Attribute Control Method

This article describes the new method, as shown in Fig. 2, which has two individual control blocks to save the current character attribute for each key and host, and a status flag of key to indicate that the character attribute has been requested by key. The conventional character attribute control method can not cause a character attribute requested by the key to differ from one by the host (communicated with a computer or a terminal) because it had only one control block to save the current character attribute for key and host, as shown in Fig. 1. The ASCII terminals, which use the conventional method, can not display entering characters on the screen with a character attribute which is the same as one that receiving characters have. The displaying address on the screen of the entering key can be different from that of the receiving character. A character attribute is like that shown below. Nondisplay/High Intensity/Blink/Underline/Reverse Foreground colors/Background colors The conventional method (Fig. 1) has the following two defects: 1. The character attribute requested by the key affects that of the receiving characters from the host to display on the screen and makes it equal. For instance, in Block mode, when a host transmits characters to a terminal and they are being displayed with High light in BA (Buffer Addressing) mode on the screen, the requirement to change the current character attribute to blink by key also changes the character attribute of receiving characters from host to blink without a report on it to the host. 2. The character attribute which will be displayed by pressing a key unconditionally replaces the character attribute which has been displayed on the screen. The advantage is that a host can request a character attribute of characters entered by key to display on the screen. But simply having two individual control blocks for each key and host, to solve the above defect 1, loses the advantage of the conventional method. In the new method, the status flag is set to off when the terminal is powered on and set to on once...