S
Legacy systemW
Legacy system
Alex (videotex service)W
Alex (videotex service)
A
Cab Secure RadioW
Cab Secure Radio
CompunetW
Compunet
B
Legacy portW
Legacy port
Micronet 800W
Micronet 800
C
MinitelW
Minitel
OS/2W
OS/2
D
PrestelW
Prestel
TeletexW
Teletex
E
TeletextW
Teletext
TOPSW
TOPS
F
VideotexW
Videotex
ViewdataW
Viewdata