Home » CEEFAX disks » telesoftware7.adl » 18-06-88/NEWSTXT

18-06-88/NEWSTXT

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk: Home » CEEFAX disks » telesoftware7.adl
Filename: 18-06-88/NEWSTXT
Read OK:
File size: 1E69 bytes
Load address: 0000
Exec address: FFFFFFFF
File contents
Extra! Extra! ... Read all about it ....

Get yourelf a copy of the CEEFAX Daily News!

How up-to-date is your morning newspaper? No matter how efficient the
presses are, you can't get a paper with more recent news than the CEEFAX
Daily News!

The program "News" will produce a printed copy of all the latest news
stories from CEEFAX pages. Simply run the program when you get out of bed,
and your newspaper will be delivered before breakfast! And it will cost
nothing (well, just the cost of the printer paper!)

Within minutes of a news story breaking, the CEEFAX news team can have the
details "on air" and available to millions of people nationwide! Now you
can have your own printed copy of the very latest news - hours before even
the most efficient newspaper can release the stories!

The program looks at the news pages from CEEFAX (pages 103 to 118), gets
rid of colour control codes and the like, then merges alternate lines to
produce rows of text suitable for a standard 80-column printer.

It has been deliberately designed for use with any printer, and therefore
produces only the normal ASCII characters, and no printer control codes at
all. This compatibility has been achieved at the loss of correct
interpretation of the quarter, half and three-quarter symbols, which will
appear as curly brackets and oblique stroke. However, these are not common
symbols on the news pages, and should rarely affect the output.

One symbol that does differ from printer to printer is the pound sign. If
your printer uses a code other than 35 to print this character, then
remove the "REM" from line 980, suitably adjusting the rest of the line to
give the code your printer requires.

The program does, of course, need a teletext adapter (the BBC
Microcomputer System adapter with ATS). To achieve a tolerable speed, 17
of the adapter's page grabbers are put into action to simultaneously grab
all the news pages, plus the news index page (page 102). The latter is
used to provide a suitable heading to each story, which is included in the
printout underlined with "=" characters to ensure compatibility with most
printers.

By using several page grabbers, the entire CEEFAX news section can be
received in less than 20 seconds, whereas receiving just one page at a
time would take around 6 minutes!

The stories themselves are stripped of teletext control codes. Trailing
and leading spaces on each row are removed, then each pair of lines joined
together to produce up to 79 characters per row of text (suitable for
standard printer paper or a mode 131 display).

Because the whole news area of CEEFAX is committed to computer memory,
there is not enough space left for high resolution (80 column) screen
modes. For those who have Shadow screen memory on their machines, a good
display can be obtained by selecting MODE131 in line 280 instead of MODE
7. For those without such facilities, using MODE 3 will crash the system.
However, as the program is primarily for printed copy, it seems somewhat
arbitrary which screen mode is used.

You may also produce a text file of the news, ready to be *TYPEd or READ
into a wordprocessor. Here you can really begin to play "Editor",
adjusting the news stories as you want! Simply choose this option when
prompted, and you will be asked for a filename. In order to make the
procedure as versatile as possible with different filing systems, no check
is made as to the suitability of the given name for the filing system in
use. Such checks must be made manually in order to avoid overwriting some
important file or getting the "bad filename" error.

Because of the hardware restrictions of certain designs of teletext
adapter, the program cannot be guaranteed compatible with all adapter
makes. It has been written for use with the BBC Microcomputer System
adapter. Users of the Morley adapter should read the note below.

If you are using an older version of the BBC Micro, with BASIC 1, you may
find it necessary to delete the REM statement lines. BASIC 1's string
handling capabilities are not quite as efficient as those of later
versions of BASIC, and a "no room" error may result.

So take a copy of your very own CEEFAX Daily News to work and keep really
up to date with the news! If you want the late or the evening editions,
just run the program and your copy will be delivered within minutes!

__________________________________________________________________________

Procedures/Functions:

PROCsetpages       - limits the number of teletext lines received per
                     CEEFAX page to only the displayable part of each page

FNcheck_got        - checks to see if each page has been received by its
                     appropriate page grabber

PROCoscli          - an OSCLI simulation to maintain compatibility with
                     BASIC1

PROCstop_updates   - checks to see if the page is currently being updated
                     (i.e. if a new version of the page is in the process
                     of overwriting the existing copy)

PROCset_hold       - puts the page in 'HOLD' mode to prevent any further
                     updates

PROCreset_grabbers - clears the page grabber records so they no longer
                     search CEEFAX for information

PROCwait_for_pages - waits until all the page grabbers report they have
                     actually received the page they are looking for

PROCprintpages     - converts the page into ASCII format, trims the lines
                     to remove control codes, trailing and leading spaces
                     etc., then prints the text to file and/or printer

PROCcheckline      - checks for blank lines, ignoring them as required

FNprinttitle       - finds, converts and prints the appropriate heading to
                     the next story

FNadapter          - checks if the adapter is connected, on and receiving
                     teletext transmissions

PROCselect         - requests details of the users requirements for the
                     output route(s)
__________________________________________________________________________


NEWS program for the Morley adapter:
====================================

The BBC Microcomputer System adapter (either Acorn or GIS) has the
facility to allow simultaneous capture of up to 20 CEEFAX pages. This
feature is incorporated in the "NEWS" program to capture the 15 pages
carrying the news stories plus the index page (102) from which it
calculates the appropriate story headline.

The Morley adapter is so designed that this feature cannot be implemented.
Modifications are therefore required to eliminate the need for more than
one page to be searched for at a time. This causes problems in two areas:

1. By not receiving all the page in a single cycle the program runs more
slowly. A comparative test between both versions of "News" showed an
increase in execution time of the Morley version of over 50% that of the
original.

2. Because the CEEFAX news pages are updated regularly, any time delay
between receiving the news story and receiving its appropriate headline
could result in the wrond details being given to the title! To prevent
this, the original version "grabbed" all 16 pages during a single CEEFAX
cycle. This is not possible with the Morley adapter, so the alterations
ensure that a new "headlines" page is obtained immediately after receiving
the news story details. In this way, it can be (almost) guaranteed that
any news page updated during the execution of this program will bear the
correct headline.

Users of the Morley adapter must use the version entitled "MORNEWS".
Although this will also work with the BBC Microcomputer System adapter,
users of the Acorn or GIS units will find the version called "NEWS" a
far more efficient and faster routine.
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00000010  2e 2e 20 52 65 61 64 20  61 6c 6c 20 61 62 6f 75  |.. Read all abou|
00000020  74 20 69 74 20 2e 2e 2e  2e 0d 0d 47 65 74 20 79  |t it ......Get y|
00000030  6f 75 72 65 6c 66 20 61  20 63 6f 70 79 20 6f 66  |ourelf a copy of|
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000001f0  65 20 70 72 69 6e 74 65  72 20 70 61 70 65 72 21  |e printer paper!|
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00001e60  72 6f 75 74 69 6e 65 2e  0d                       |routine..|
00001e69
18-06-88/NEWSTXT.m0
18-06-88/NEWSTXT.m1
18-06-88/NEWSTXT.m2
18-06-88/NEWSTXT.m4
18-06-88/NEWSTXT.m5