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24-02-89/Protocl
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 » telesoftware14.adl |
| Filename: | 24-02-89/Protocl |
| Read OK: | ✔ |
| File size: | 78EC bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
File contents
Satellite Image Data File Protocol
==================================
The data file is not a "Screen Memory Dump", and thus it is not
specific to one particular display device or computer. With suitable
software, it may be interpreted by any computer to make the best use of
whatever display is available. Programs for the BBC micro, Archimedes,
and IBM PC will be supplied initially, but these will only use a subset of
the full features available in the format.
The resolution and tonal gradation of the broadcast data are not
fixed, but a header on the data file specifies all of the parameters. The
rest of this document will describe the format of the header (which is
just the first n bytes of the file), and the values used in the initial
stages of the service.
No. Pos Len Description
1 0 2 Header Length, Integer Lo-Hi
2 2 1 Data Format Number, Byte (&03)
3 3 1 Data Coding, Byte (&84)
4 4 1 Tonal Gradation, Byte
5 5 2 Pixels per line, Integer Lo-Hi
6 7 2 Lines per frame, Integer Lo-Hi
7 9 2 X offset, Integer Lo-Hi ) Image origin is first
8 B 2 Y offset, Integer Lo-Hi ) pixel plotted.
9 D 4 Border: Top/Bottom width, colour; Edge width, colour.
10 11 1 Scan Direction & Unimportant Areas, Byte
11 12 1 Screen Ident Message flag, Byte - "Bit-mapped"
12 13 ? Screen Ident/Message text, Ascii, ends with null
13 ?? 1 Data Source Credit Message flag, Byte - "Bit-mapped"
14 ?? ? Credit text, Ascii, ends with null
15 ?? ? Image source name, Ascii, ends with null
16 ?? 1 Radiation Type, Byte
17 ?? (6) Date, Ascii (ddmmyy), ends with null
18 ?? (4) Time, Ascii (hhmm), ends with null
19 ?? (12) Julian Day Number, Ascii (ddddddd.ffff), ends with null
20 ?? 1 Area Depicted, Byte (Bit 7 set means "Overlay")
21 ?? 1 Map Projection, Byte
22 ?? 8 Mapping Co-ordinates point 1, 4 integers Lo-Hi
23 ?? 8 Mapping Co-ordinates point 2, 4 integers Lo-Hi
24 ?? (16) Grey Scale representation, Bytes (no of = item 4)
25 ?? (48) Recommended display level, Byte triplets (3x item 4)
26 ?? 2 Number of Post-Data Text Strings, Integer Lo-Hi
27 ?? ? Filler bytes (& format extensions), undefined
28 ?? ? Main data, start defined by item 1
29 ?? ? Continuation flag (end of field marker)
30 ?? 2 X co-ordinate of first string, Integer Lo-Hi ) image
31 ?? 2 Y co-ordinate of first string, Integer Lo-Hi ) pixels
32 ?? 1 Text colour, Byte
33 ?? 1 Background colour, Byte
34 ?? 1 Fount flag, Byte
35 ?? ? Text string, Ascii, ends with null
The following table briefly describes the function of each byte in
the header, and the options available - more detail is given in the
explanatory notes at the end. Initial values are shown in the Example
column. Where a number of options are available, others may be added in
future as the need arises. These will, of course, be well publicised.
--------------------------------------------------------------------------
Item Length Data Description Example
No. (Bytes) type
--------------------------------------------------------------------------
1 2 Integer Length of header &00B0
(Offset into file of first data byte)
2 1 Byte Data format number 3
3 1 Byte Data coding: &84
1 = one pixel per byte,
right(lo) justified.
2 = one pixel in each nybble,
lo nybble first.
&81 = run-length coded, each run
occupying two bytes.
Colour, then length
&82 = run-length coded, each run
fully defined by one byte.
&83 = Enhanced run-length coding,
using two bytes.
Colour, then length
&84 = Ditto, with single byte
(see note 4)
4 1 Byte Tonal Gradation 16 (&10)
(number of steps in grey scale)
5 2 Integer Pixels per line 276 (&114)
6 2 Integer Lines per frame 200 (&C8)
7 2 Integer X offset from left of screen MDI (&8001)
(see note 7)
8 2 Integer Y offset from bottom of screen MDI
(see note 7)
9 4 Bytes Width and Colour of border 4,10,4,10
(see note 8)
10 1 Byte Scan Direction and Unimportant Areas &3B
(see note 9) (%00111011)
11 1 Byte Screen ident message flag &04
Bit mapped. (see note 10) (%00000100)
12 ? Ascii Screen ident / displayable text message <none>
Only present if bit 1 of flag set.
13 1 Byte Data source credit message flag &07
Bit mapped. (see note 11) (%00000111)
14 ? Ascii Credit message text. see note 11
Only present if bit 1 of flag set
15 (8) Ascii Image source name. METEOSAT
METEOSAT
NOAA-7
GOES-East
RADAR
DIGITAL
16 1 Byte Radiation type 1
1 = Infra Red
2 = Visible
3 = Water Vapour
4 = Radar
&10 = Digital
17 (6) Ascii Date image recorded 291087
DDMMYY = day, month, year
18 (4) Ascii Time image recorded
HHMM = hour, minute 1200
19 (12) Ascii Julian Day Number 2447098.0000
(See note 13)
20 1 Byte Area depicted 2
1 = World
2 = North Atlantic
3 = Europe
4 = Britain
Bit 7 set means "Overlay"
21 1 Byte Map Projection 2
1 = Space view
2 = Polar stereographic
3 = Cartesian
4 = Linear
(see note 14)
22 Mapping co-ordinates - point 1 see note 15
2 Integer Latitude (hundredths of degrees) MDI
2 Integer Longitude ( " " " ) MDI
2 Integer Pixel number of co-ordinate MDI
2 Integer Line number of co-ordinate MDI
23 8 Integer Mapping co-ordinates - point 2
(as for point 1)
24 (16) Bytes Grey scale representation see note 16
These bytes contain the highest 8-bit
value of the raw data that is coded into
each level. The number of entries is the
same as the tonal gradation, item 4.
25 (48) Bytes Triplets containing the recommended see note 17
display level (on a scale from &00 to
&FF) for the Red, Green, and Blue guns
respectively, for each data level.
The number of entries is three
times the tonal gradation (item 4).
26 2 Integer Number of text strings that 0
follow main data. (see note 18)
27 ? Bytes Undefined bytes to fill to end &FF
of header as specified in item 1.
These will be used for format
extensions in the future.
28 Main data, pointed to by item one of the header.
29 Continuation flag (end-of-field marker - see note 4)
After the data there may be several text strings to be superimposed
over the screen image. Each string will have the following block
of parameters: (see note 18 for details)
30 2 Integer X co-ordinate of first string <none>
31 2 Integer Y co-ordinate of first string <none>
32 1 Byte Colour of text, using same <none>
range as main data, eg &00 to
&0F. &FF means 'transparent'.
33 1 Byte Colour of background <none>
Range as above.
34 1 Byte Flag byte for fount, size, etc. <none>
35 nn Ascii Text string terminated by a null. <none>
Items 30 to 35 repeated as often as indicated by item 26.
Notes
=====
1) This format is based on that used by the Met. Office for the files
from which the transmitted data is derived. However, it has been
modified to better suit our needs.
2) Three data types are used in the header: Ascii, Byte, and Integer:
Ascii: is a printable text string of variable length delimited by
a Null (CHR$0).
Byte: can either be an 8 bit unsigned number, or 8 flag bits in
a single character.
Integer: is a 16 bit signed number, transmitted low byte first.
Any data that is not supplied will be replaced by a "Missing Data
Indicator" appropriate to the data type - Ascii strings will just
consist of the terminating null, Bytes by &FF, and Integers by -32767
(&8001).
3) The format number (item 2) identifies the contents of the header. The
Met. Office format is a 2-byte integer, number &0001, but this format
uses a single byte, value &03. (The format used in the Telesoftware
trials also used a single byte, value 2, but that has been completely
replaced by this format, and will never again be used.)
4) Item 3 - Data Coding. The easiest, but least efficient, way to code
the data would be for each byte to define a single pixel (with up to
256 colours) - this is format 1. Where tonal gradation is limited to
16 steps (or less) per pixel, the file size may be halved by using
each nybble (half byte - 4 bits) to define a separate pixel. This is
format 2. The low nybble (least significant 4 bits) defines the first
pixel, and the top nybble the second.
Except on very rare occasions, Run Length Coding may be used to
significantly reduce the file size. This method specifies the colour
of not just a single pixel, but of several (a run) that are all the
same colour. Format &81 uses two bytes for each run - the first for
the colour, and the second for the number of pixels of that colour.
Format &82 uses a single byte for each run, with the colour in the low
nybble (hence limited to 4 bits), and the run length in the high
nybble. As a run length of zero is non-sensical, the value of the
byte (or nybble) defining the run is the actual run-length minus 1,
hence runs of 1 to 16 may be coded in format &82. Longer runs are
simply defined by a combination of one or more maximum length runs,
followed by a shorter one to finish it off. While the number of
pixels per line is specified in the header, the end of each line is
also marked by a run of one pixel of black (colour zero), followed by
a maximum run of black. This sequence cannot normally occur, as if
there was a run of this length in the picture, the long run would be
sent first.
Formats &83 and &84 extend the run-length idea to better cope with
long runs. As format &84 is used, this will be described, but &83 is
similar, except that it can, of course, cope with finer tonal
gradations, and longer runs (255) in a single byte.
Runs of only 1 to 15 are now coded in a single byte by &0n to &En
(for colour number 'n'). The old maximum run of &Fn now means that the
next byte specifies a long run. As the colour is still given by the
first byte, the second may be given over entirely to the length. Only
runs of 16 or more will be defined in this way, so the second byte
represents the run length minus 16, giving runs of 16 to 270 for bytes
&00 to &FE. Once again the maximum (&FF) infers that the run is
greater than 270, and the next (third) byte is the run length minus
271, and so on for as many maximum bytes as are necessary.
The end of line is now marked by a single pixel 'run' of any
colour, followed by any run of the same colour, ie &0n, &Xn ('n' being
the same for both bytes, and 'X' being any hex digit). Once again,
this sequence cannot occur naturally. It is not just a marker, but
actually means "Draw to end of line in specified colour".
If 'X' is 0, then this is just the end of a line. Values greater
than 0 will be used to indicate the end of the field, initially this
will be 'F'. Intermediate values of 'X' may be defined later, if a
sequence of related screens are sent in one file for example, when
anything less than 'F' will act as a 'Continuation flag', meaning that
more data follows. In this case, a new header sequence will follow.
Annotation text (items 26 and 30-35) may follow each field, as the
position co-ordinates in items 30 and 31 refer to the picture (field)
boundary, and not the edge of the screen.
5) Item 4 determines how accurately the brightness of each pixel is
depicted, and indicates the range of brightness levels. Initially
this is 16, needing four bits per pixel. Values of 0 and 1 are, of
course, non-sensical, and are thus reserved as special cases.
6) The data from the Met. Office is to a higher resolution than we are
currently transmitting on Ceefax, and in fact corresponds to the
digital video standard of 720 pixels by 576 lines. This is much
higher than most people could display, but the main reason for
reducing the resolution is that the resulting files are often greater
than 100 kbytes! Reducing the resolution by two in both vertical and
horizontal directions results in files of about 25 kbytes, so several
days worth can be saved on a disc.
7) A normal satellite image will be positioned centrally within the
screen area, maybe vertically justified if necessary to allow room for
the ident message below. It is possible, however, that a smaller
picture than usual may be sent with surrounding text (see note 18), or
a series of small pictures to be placed in the corners of the display
(see end of note 4). Items 7 & 8 will allow the displayed image to be
positioned anywhere on (or off!) the actual screen. These co-
ordinates will be in units of image pixels, with the screen origin
being bottom left. The offset does not point to the bottom left of
the displayed image, but rather to the first pixel to be plotted.
Which corner this is depends on the Scan Direction byte, item 10.
This considerably simplifies the code for the display program, as it
simply has to plot relative to that point, and not do additions of
image width and/or height to find the start point.
The screen size is assumed to be 320 pixels wide by 256 pixels high
for the current size of image - displays that have less vertical
resolution may need manual intervention by the operator to achieve a
satisfactory result. If items 7 or 8 contain the MDI (&8001), then
the image should be centred on that axis. Negative or very large
numbers that shift the image outside of the display area are quite
permissible. Although seemingly pointless, this allows for a
pre-processed image to be easily re-used just by altering these
offsets. See also item 10, note 9.
8) A border may optionally be drawn around the outside of the image area.
The four bytes in item 9 define respectively the width of the top and
bottom borders (in pixels) and their colour, and the width of the side
borders and their colour. They are defined separately so that if
images with different horizontal and vertical resolutions are sent,
then the border may be defined so be a similar apparent thickness all
round, or otherwise as desired.
9) The order in which the pixels are defined is determined by the three
least significant bits of the "Scan Direction and Unimportant Areas
Byte" (item 8). As indicated in the table below, Bit 0 determines
whether scanning is from Right-to-Left, or Left-to-Right, and Bit 1
whether from Top to Bottom or Bottom to Top. Bit 2 shows whether the
data is sent line by line (Row Order), or column by column (Column
order). The Met. Office send us the data for the North Atlantic
satellite picture line by line, right to left, and bottom to top. As
there is no reason to change this (something that would require a lot
of data shuffling anyway), we transmit it in the same fashion.
Some display devices may not have sufficient resolution to show the
whole image. The remaining bits of this byte are therefore used to
indicate which parts of the image may be safely lost. If Bit 3 is set
then the bottom of the image contains the area that will be of inter-
est to most people, and the display program should arrange to lose as
many lines from the top of the image as is necessary. Similarly if
Bit 4 is set, then lines from the bottom may be lost. If both of
these bits are set, then the centre of the image is required, and
lines may be lost (equally) from top and bottom. If neither bit is
set, then all of the image is considered important, and the display
program should, wherever possible, make every effort to display the
whole image. The same rules apply for Bits 5 and 6, relating to left
and right respectively.
If Bit 7 is set, then the transmission is assuming that the display
device can show a full screen image of 320 pixels by 256 lines, and
even if the current image is much smaller than that, subsequent images
may be sent which will fill the area. Scaling down may therefore be
necessary, but it is not essential for the image to be scaled up to a
full screen size, a slightly smaller window being quite acceptable if
the display has a higher resolution.
Set Clear
=== =====
Bit 0 = Right to Left Left to Right
Bit 1 = Bottom to Top Top to Bottom
Bit 2 = Column Order Row Order
Bit 3 = May Lose Top Don't
Bit 4 = May Lose Bottom Don't
Bit 5 = May Lose Left Don't
Bit 6 = May Lose Right Don't
Bit 7 = Fixed size Scaling up acceptable
10) The display program may add a caption to the decoded picture to
identify the source, radiation, date, and time, particularly if the
image doesn't fill the complete screen. Item 12 is a text message
that is intended to replace this internally generated default caption.
It is used, for example, in the Land Mass files, where the "DIGITAL"
source label is not very helpful.
The display program will have overall authority on what is and what
isn't displayed on the screen, but the flag byte of item 11 will
suggest whether any message is intended for such a display. The
position to place the text on the screen is also up to the display
program, but it is anticipated that it will be central under the image
window. An alternative use of this text is to display a message
before decoding of the screen data begins.
The bits of the flag byte (item 11) have the following meanings:
Set Clear
=== =====
Bit 0 = Text Following No text following
Bit 1 = Use this text Use default text
Bit 2 = Display on Image screen Don't
Bit 3 = Display over final image Don't
Bit 4 = Display this text before decoding Don't
Bits 5, 6 & 7 undefined
Bit 0 explicitly indicates if there is any text following the flag
byte. If set, then any text will be terminated by a Null (&00), but
it is quite permissible to have a null (zero length) string, when only
the terminating byte will be present.
Bit 1 shows whether the following message should be used to replace
any default text. The default is the Satellite name, Radiation type,
Date and Time.
Bit 2 requires which ever text is selected by Bit 1 to be displayed on
the graphics screen before the image is plotted. A large image may
overwrite this text, and so Bit 3 requires the text to be written over
the final image. The fount and colour of this text is left to the
discretion of the program.
Some machines, including the BBC micro, use different screen modes for
the graphic display and normal text. Bit 4, if set, means that the
following text (regardless of Bit 1) should be displayed in the text
mode prior to switching (after some kind of delay) to the graphics
mode for image display. This enables a message to be included with
the data, and still allow the default text to be displayed on the
screen. Clearly it is would be non-sensical for either of Bits 1 or 4
to be set if Bit 0 is clear - this is an error condition.
11) Item 14 is another text string which will usually be included to
credit the supplier of the data. For the satellite images, this is
the Met. Office, and will read "Data supplied by the Met Office". It
is quite possible that this data protocol may be used for other screen
images, and so this item will then contain an appropriate credit.
It is intended that the credit will be displayed on screen, but like
the screen ident message above, the option exists to display it before
drawing the main screen, or not at all. This is indicated by the flags
in item 13 which have the same meanings as for the screen ident flag,
except that there is no default message, and so no credit would be
displayed if Bit 1 is clear in item 12. The position, fount, and
colour of the text on the screen is again up to the display program,
but it is anticipated that it will be central above the image window.
12) Item 15 is the name of the data source. It will normally be the name
of the satellite from which the image comes (eg METEOSAT), but
rainfall radar images would be called "RADAR", and computer generated
data (for example the land mass 'image' provided to superimpose on the
cloud picture) is called "DIGITAL".
13) Items 17, 18, and 19, the Date and Time. These are given in two
formats - a 'human readable' form, and the Julian Day number. This
latter is a 12 character Ascii string, the first seven being the
integer part of the JD, then a decimal point (full stop - Ascii &2E),
and then a four digit decimal fraction (allowing the time to be
specified to 8.64 seconds). For the initial midday images, this
fraction will be zero of course, hence the example in item 19.
The Date and Time are in UTC, (approximately = GMT), and refer to the
start of transmission of the image from the satellite. The minutes
part of the time will often be zero.
Some or all of these fields may contain 'null strings', on the Land
Mass files for example, where the data is (almost) timeless.
14) Item 21 - Map projection. Meteosat is geostationary over the equator,
and so it's view of the higher latitudes is rather cramped vertically.
The Met. Office computer has therefore re-plotted the image as if the
satellite was over the north pole, and we see a window of this view
that covers Europe and the North Atlantic.
15) Items 22 and 23 are co-ordinates to allow the receiver to register the
satellite picture to a land map, or possibly overlay a Latitude/
Longitude grid. The Pixel and Line (X and Y) co-ordinates will be
relative to the Left and Bottom of the image respectively, and in
units of the image pixel, not those of any specific display device.
Initially these co-ordinates will contain the MDI data (&8001).
16) Item 24 - Grey scale representation. The number of entries in this
table will be the same as the tonal gradation (number of steps in the
grey scale) given in item 4. In order to prevent low level infor-
mation from obscuring the wanted information, anything below about one
third brightness is declared 'black' by the Met. Office processing,
and the other fifteen levels are assigned the remainder of the
brightness range. The actual values of source data that are coded
into the sixteen possible levels are given in this table. This may
vary, but a list of typical values is given below:
0 1 2 3 4 5 6 7 8 9 A B C D E F
64, 69, 6E, 73, 78, 7D, 82, 87, 8C, 91, 96, 9B, A0, A5, AA, FF
17) Item 25 contains groups of three bytes that have the recommended
brightness, on a scale of &00 to &FF, of the Red, Green, and Blue guns
respectively for each display level. The number of entries in this
table will be three times the tonal gradation (number of steps in the
grey scale) given in item 4. By default, this table will contain
values to give a linear grey scale. These values are as follows:
0 1 2 3 4 5 6 7 8 9 A B C D E F
00, 10, 20, 30, 40, 50, 60, 70, 80, 90, A0, B0, C0, D0, EO, F0
18) If parts of the image need annotating, a map for example, then it is
far more efficient to send the Ascii text string than to superimpose
it on the screen before coding. This also allows the display device
to use whatever founts it has to best advantage. If any such text
strings are to be sent, they will be at the end of the main data, and
item 26 at the end of the header will contain a count of the number of
strings that are included.
Each string has associated X and Y co-ordinates, and foreground and
background colour bytes. The co-ordinates follow the usual rule, and
count pixels from the left and bottom of the image, not the screen,
and regardless of the scan direction given by item 6. They point to
the top left hand corner of the character cell for the first character
of the string. If the whole of the transmitted picture is not
displayed, it is important to take into account where the transmitted
boundaries are, and not to use the displayed boundaries. The exact
use of the colour bytes, in particular the top nybble, has yet to be
defined.
The byte of item 34 contains a number of flag bits as follows:
bits 0 and 1 Width of text fount (0-3)
bits 2 and 3 Height of fount (0-3)
bits 4, 5, & 6 Fount number (0-7)
bit 7 Normal (0) or Italic (1)
A size of 1 is expected to be (about) 8 pixels in the appropriate
direction, with sizes 2 and 3 being double and treble (quad?) that
number, and 0 being smaller (4-6 pixels?). The fount numbers have
yet to be allocated, but 1 will be the 'normal' fount.
19) As the size of the header is specified in item 1, there is no need to
pad it out to a fixed size. However the format may be extended at a
later date, and extra information added to the header. This will be
added at the end of the header, and so any data after item 26 before
the start of the image data will be considered as "undefined bytes" by
programs working to this specification.
Hex dump of a typical header:
0000 B0 00 03 84 10 14 01 C8 00 01 80 01 80 04 0A 04 ................
0010 0A 3B 04 07 44 61 74 61 20 73 75 70 70 6C 69 65 .;..Data supplie
0020 64 20 62 79 20 74 68 65 20 4D 65 74 20 4F 66 66 d by the Met Off
0030 69 63 65 00 4D 45 54 45 4F 53 41 54 00 01 32 32 ice.METEOSAT..22
0040 30 32 38 39 00 31 32 30 30 00 32 34 34 37 35 38 0289.1200.244758
0050 30 2E 30 30 30 30 00 02 02 01 80 01 80 01 80 01 0.0000..........
0060 80 01 80 01 80 01 80 01 80 6E 72 76 7B 7F 83 88 .........nrv{...
0070 8C 90 95 99 9D A2 A6 AA FF 00 00 00 10 10 10 20 ...............
0080 20 20 30 30 30 40 40 40 50 50 50 60 60 60 70 70 000@@@PPP```pp
0090 70 80 80 80 90 90 90 A0 A0 A0 B0 B0 B0 C0 C0 C0 p...............
00A0 D0 D0 D0 E0 E0 E0 F0 F0 F0 00 00 FF FF FF FF FF ................
----- oOo -----
BBC Telesoftware, 22nd February 1989
Ceefax, Room 7013, BBC TV Centre, London.
00000000 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000010 20 20 20 20 53 61 74 65 6c 6c 69 74 65 20 49 6d | Satellite Im|
00000020 61 67 65 20 44 61 74 61 20 46 69 6c 65 20 50 72 |age Data File Pr|
00000030 6f 74 6f 63 6f 6c 0d 0a 20 20 20 20 20 20 20 20 |otocol.. |
00000040 20 20 20 20 20 20 20 20 20 20 20 20 3d 3d 3d 3d | ====|
00000050 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d |================|
00000060 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 0d 0a |==============..|
00000070 0d 0a 0d 0a 20 20 20 20 20 20 20 54 68 65 20 64 |.... The d|
00000080 61 74 61 20 66 69 6c 65 20 69 73 20 6e 6f 74 20 |ata file is not |
00000090 20 61 20 20 22 53 63 72 65 65 6e 20 20 4d 65 6d | a "Screen Mem|
000000a0 6f 72 79 20 44 75 6d 70 22 2c 20 20 61 6e 64 20 |ory Dump", and |
000000b0 74 68 75 73 20 69 74 20 69 73 20 6e 6f 74 0d 0a |thus it is not..|
000000c0 73 70 65 63 69 66 69 63 20 20 74 6f 20 20 6f 6e |specific to on|
000000d0 65 20 20 70 61 72 74 69 63 75 6c 61 72 20 20 64 |e particular d|
000000e0 69 73 70 6c 61 79 20 64 65 76 69 63 65 20 6f 72 |isplay device or|
000000f0 20 63 6f 6d 70 75 74 65 72 2e 20 20 57 69 74 68 | computer. With|
00000100 20 20 73 75 69 74 61 62 6c 65 0d 0a 73 6f 66 74 | suitable..soft|
00000110 77 61 72 65 2c 20 20 69 74 20 6d 61 79 20 62 65 |ware, it may be|
00000120 20 69 6e 74 65 72 70 72 65 74 65 64 20 20 62 79 | interpreted by|
00000130 20 20 61 6e 79 20 63 6f 6d 70 75 74 65 72 20 74 | any computer t|
00000140 6f 20 6d 61 6b 65 20 74 68 65 20 62 65 73 74 20 |o make the best |
00000150 75 73 65 20 6f 66 0d 0a 77 68 61 74 65 76 65 72 |use of..whatever|
00000160 20 64 69 73 70 6c 61 79 20 69 73 20 61 76 61 69 | display is avai|
00000170 6c 61 62 6c 65 2e 20 20 50 72 6f 67 72 61 6d 73 |lable. Programs|
00000180 20 66 6f 72 20 74 68 65 20 20 42 42 43 20 20 6d | for the BBC m|
00000190 69 63 72 6f 2c 20 20 41 72 63 68 69 6d 65 64 65 |icro, Archimede|
000001a0 73 2c 0d 0a 61 6e 64 20 49 42 4d 20 50 43 20 77 |s,..and IBM PC w|
000001b0 69 6c 6c 20 62 65 20 73 75 70 70 6c 69 65 64 20 |ill be supplied |
000001c0 69 6e 69 74 69 61 6c 6c 79 2c 20 62 75 74 20 74 |initially, but t|
000001d0 68 65 73 65 20 77 69 6c 6c 20 6f 6e 6c 79 20 75 |hese will only u|
000001e0 73 65 20 61 20 73 75 62 73 65 74 20 6f 66 0d 0a |se a subset of..|
000001f0 74 68 65 20 66 75 6c 6c 20 66 65 61 74 75 72 65 |the full feature|
00000200 73 20 61 76 61 69 6c 61 62 6c 65 20 69 6e 20 74 |s available in t|
00000210 68 65 20 66 6f 72 6d 61 74 2e 0d 0a 0d 0a 0d 0a |he format.......|
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00007870 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00007880 20 20 20 20 20 20 2d 2d 2d 2d 2d 20 6f 4f 6f 20 | ----- oOo |
00007890 2d 2d 2d 2d 2d 0d 0a 0d 0a 0d 0a 42 42 43 20 54 |-----......BBC T|
000078a0 65 6c 65 73 6f 66 74 77 61 72 65 2c 20 32 32 6e |elesoftware, 22n|
000078b0 64 20 46 65 62 72 75 61 72 79 20 31 39 38 39 0d |d February 1989.|
000078c0 0a 43 65 65 66 61 78 2c 20 52 6f 6f 6d 20 37 30 |.Ceefax, Room 70|
000078d0 31 33 2c 20 42 42 43 20 54 56 20 43 65 6e 74 72 |13, BBC TV Centr|
000078e0 65 2c 20 4c 6f 6e 64 6f 6e 2e 0d 0a |e, London...|
000078ec 
24-02-89/Protocl.m0
24-02-89/Protocl.m1
24-02-89/Protocl.m2
24-02-89/Protocl.m4
24-02-89/Protocl.m5
.