Advanced Teletext System User Guide

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The Advanced Teletext System User Guide *MAGAZINE Description This command controls which magazine's Headers are displayed. In Teletext, the pages are grouped together in 'magazines'. These consist of up to 100 pages. The initial page digit signifies which magazine the page is in; 103,156, and 175 are all in Magazine 1, and 704 is in Magazine 7, etc. There are two ways of transmitting Magazines in Teletext. In one the magazines are sent in numeric order, e.g. Magazine 1, Magazine 2, etc. This is called 'serial' transmission. In this case, all the Headers for all the magazines are displayed and the *MAGAZINE command has no effect. The other method is to send the magazines in 'parallel' . An example page sequence might be 100, 200,101,201,102,202,etc. In this case the Headers appear to flicker. Syntax *MAGAZINE where is the first digit of the page numbers to be displayed. Example *TTXON *ITV *HON *MAGAZINE 1 This will display only those Headers whose page number begins with 1. *NOTTX Description This command 'removes' the Teletext ROM from the Operating System's view. It produces the message 'Press CTRL-BREAK...'. Once 'removed' in this way, Teletext no longer takes up any of the computer's memory and the Teletext commands become inoperative. The only way to 'replace' the ROM is to switch the computer off and on again. A less drastic, but non-software method of switching off the Teletext system is to switch off the Adaptor, and press BREAK on the computer keyboard. The Teletext system can then be switched on again by switching on the Adaptor and pressing BREAK. Syntax *NOTTX 26
The Teletext Operating System Commands Notes Switching the Teletext system on and off will alter PAGE in a Model B or B+ computer. You should therefore save any programs you are working on before issuing this command. This is NOT the case with *TTX. *PAGE Description This command sets the specified Teletext page as the current page. Syntax *PAGE [S
Page 3 and 4: Advanced Teletext System USER GUIDE
Page 5 and 6: Contents Introduction 6 1 Getting S
Page 7 and 8: D CP/M, PANOS, & DOS+ Telesoftware
Page 9 and 10: 1 Getting Started 1.1 The Component
Page 11 and 12: 1.3 Tuning the Teletext Adaptor Get
Page 13 and 14: 2 The Teletext Terminal The Teletex
Page 15 and 16: 2.5 Tune a Channel The Teletext Ter
Page 17 and 18: The Teletext Terminal come round. T
Page 19 and 20: 3 The Telesoftware Terminal 3.1 Int
Page 21 and 22: The Telesoftware Terminal Some of t
Page 23 and 24: 4 Teletext Operating System Command
Page 25 and 26: *DATA The Teletext Operating System
Page 27: The Teletext Operating System Comma
Page 31 and 32: *TIME The Teletext Operating System
Page 33 and 34: 5 Teletext OSWORD Calls 5.1 Introdu
Page 35 and 36: 3 Set a Record Flag The Teletext OS
Page 37 and 38: Status values are : &00 Header off
Page 39 and 40: The Teletext Operating System Comma
Page 41 and 42: 21 Return Time from TSDP This comma
Page 43 and 44: 6 Technical Information 6.1 The Tel
Page 45 and 46: Technical Information The 38th byte
Page 47 and 48: 6.3 The Teletext. Character Set Tec
Page 49 and 50: Double Height Technical Information
Page 51 and 52: A What is Teletext? Teletext is a s
Page 53 and 54: 1. Household Installations Hints on
Page 55 and 56: D CP/M, PANOS, & DOS+ Telesoftware
Page 57 and 58: F Fitting the Teletext ROM Before i
Page 59 and 60: The ROM Sockets on the Model B+ CAU
Page 61 and 62: G Summary of OS Commands *BBC Sele
Page 63 and 64: The Advanced Teletext System User G
Page 65 and 66: The Advanced Teletext System User G

Advanced Teletext System User Guide

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