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Friday, 27 February 2009 By: Steve Warner

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Teletext Information

Packet 26 - Enhanced Display Facilities & VPT


 

Bytes in Packet 26 - Enhanced Display Facilities & VPT
1-2 3 4-5 6 7-9 10-12 13-15 16-18 19-21 22-24 25-27 28-30 31-33 34-36 37-39 40-42 43-45
CRI
10101010
Framing
11100100
Magazine &
Row Address
Designation
Code
Group
1
Group
2
Group
3
Group
4
Group
5
Group
6
Group
7
Group
8
Group
9
Group
10
Group
11
Group
12
Group
13

















Packet 26 contains address, mode and data within 3 bytes. The first two bytes are hamming coded 16bits->11bits (Address 6 bits, Mode 5 bits, Hamming 5 bits) and the last parity protected byte contains associated data.

Byte 1

P1 P2 A1 P3 A2 A3 A4 P4

Byte 2

A5 A6 M1 M2 M3 M4 M5 P5

Byte 3

D1 D2 D3 D4 D5 D6 D7 D8


The functions available using data in packet 26s are:

Set full row and screen colours.
Set cursor position.
Define scrolling area.
Set foreground and background colours.
Overwrite with a character from a supplementary character set (additional symbols (figure 1), smooth mosaics and lines (figure 2). DRCS character etc.).
Additional flash controls (different flash rates, 3-phase flash which creates the impression of movement, inverted flash).
Set parallel attribute (double height/width/size, conceal etc.).
Set latching shift to a different character set.

Smoothed Mosaic Set

Example Packet 26 Capture - 10 August 1997


        CARLTON 601 Thu 10 Apr 23:42:57
      
• •… • • 
”• ••‚ ‹• PROGRAMMES 
ŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒ THURSDAY ŒŒŒŒ
10.04.
22.00 News At Ten; Weather 
22.30 London Tonight 
22.40 Do I Not Like That! 
23.40 Alfred Hitchcock Presents 

00.40 Funny Business see 609
01.15 Ed's Night Party see 609
2.45 Club Nation see 609
02.40 Access All Areas see 609

03.05 Stand and Deliver see 609
04.05 Short Story Cinema see 609
04.35 Being There see 609
05.00 The Time...The Place 
05.30 ITN Morning News 
06.00 
ŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒ
Tomorrow Subtitles Films London Tonight

News Heads Sport Election Weather 

 

 

Packet 26/0

 

1

0

00000000

00000000

0

           
1

2

99

01100011

10010

18

 

3

163

10100011

10001

17

 

4

158

10011110

10011110

158

           
2

5

162

10100010

10000

16

 

6

39

00100111

10011

19

 

7

144

10010000

10010000

144

           
3

8

113

01110001

10000

16

 

9

50

00110010

11001

25

 

10

132

10000100

10000100

132

           
4

11

123

01111011

11010

26

 

12

170

10101010

10101

21

 

13

162

10100010

10100010

162

           
5

14

185

10111001

11010

26

 

15

152

10011000

01100

12

 

16

128

10000000

10000000

128

           
6

17

124

01111100

11110

30

 

18

170

10101010

10101

21

 

19

34

00100010

00100010

34

           
7

20

186

10111010

11010

26

 

21

152

10011000

01100

12

 

22

176

10110000

10110000

176

           
8

23

130

10000010

00010

2

 

24

171

10101011

10101

21

 

25

34

00100010

00100010

34

           
9

26

178

10110010

10000

16

 

27

24

00011000

01100

12

 

28

64

01000000

01000000

64

           
10

29

132

10000100

00100

4

 

30

43

00101011

10101

21

 

31

35

00100011

00100011

35

           
11

32

178

10110010

10000

16

 

33

24

00011000

01100

12

 

34

64

01000000

01000000

64

           
12

35

163

10100011

10010

18

 

36

167

10100111

10011

19

 

37

17

00010001

00010001

17

           
13

38

148

10010100

00110

6



Packet 26/1

 

1

1

00000001

00000001

1

           
1

2

178

10110010

10000

16

 

3

24

00011000

01100

12

 

4

64

01000000

01000000

64

           
2

5

161

10100001

10000

16

 

6

43

00101011

10101

21

 

7

129

10000001

10000001

129

           
3

8

178

10110010

10000

16

 

9

24

00011000

01100

12

 

10

21

00010101

00010101

21

           
4

11

165

10100101

10100

20

 

12

43

00101011

10101

21

 

13

2

00000010

00000010

2

           
5

14

176

10110000

10000

16

 

15

24

00011000

01100

12

 

16

197

11000101

11000101

197

           
6

17

187

10111011

11000

24

 

18

43

00101011

10101

21

 

19

2

00000010

00000010

2

           
7

20

178

10110010

10000

16

 

21

24

00011000

01100

12

 

22

64

01000000

01000000

64

           
8

23

194

11000010

00010

2

 

24

171

10101011

10101

21

 

25

131

10000011

10000011

131

           
9

26

187

10111011

11010

26

 

27

152

10011000

01100

12

 

28

5

00000101

00000101

5

           
10

29

197

11000101

00100

4

 

30

43

00101011

10101

21

 

31

4

00000100

00000100

4

           
11

32

187

10111011

11010

26

 

33

152

10011000

01100

12

 

34

5

00000101

00000101

5

           
12

35

219

11011011

01000

8

 

36

43

00101011

10101

21

 

37

4

00000100

00000100

4

           
13

38

184

10111000

11010

26

 

39

152

10011000

01100

12

 

40

53

00110101

00110101

53



Packet 26/2

 

1

2

00000010

00000010

2

           
1

2

221

11011101

01110

14

 

3

171

10101011

10101

21

 

4

7

00000111

00000111

7

           
2

5

185

10111001

11010

26

 

6

152

10011000

01100

12

 

7

128

10000000

10000000

128

           
3

8

233

11101001

11010

26

 

9

171

10101011

10101

21

 

10

133

10000101

10000101

133

           
4

11

186

10111010

11010

26

 

12

152

10011000

01100

12

 

13

176

10110000

10110000

176

           
5

14

110

01101110

11110

30

 

15

175

10101111

10111

23

 

16

6

00000110

00000110

6

           
6

17

185

10111001

11010

26

 

18

152

10011000

01100

12

 

19

128

10000000

10000000

128

           
7

20

116

01110100

10101

21

 

21

127

01111111

11111

31

 

22

255

11111111

11111111

255

           
8

23

116

01110100

10101

21

 

24

127

01111111

11111

31

 

25

255

11111111

11111111

255

           
9

26

116

01110100

10101

21

 

27

127

01111111

11111

31

 

28

255

11111111

11111111

255

           
10

29

116

01110100

10101

21

 

30

127

01111111

11111

31

 

31

255

11111111

11111111

255

           
11

32

116

01110100

10101

21

 

33

127

01111111

11111

31

 

34

255

11111111

11111111

255

           
12

35

116

01110100

10101

21

 

36

127

01111111

11111

31

 

37

255

11111111

11111111

255

           
13

38

116

01110100

10101

21

 

39

127

01111111

11111

31

 

40

255

11111111

11111111

255

 

 

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