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Growth By early 1986, 1.4 million terminals were connected to Minitel, with plans to distribute another million by the end of the year. To reduce opposition from newspapers worried about competition from an electronic network, they were allowed to establish the first consumer services on Minitel. Libération offered 24-hour online news, such as results from events at the 1984 Summer Olympics in Los Angeles that occurred overnight in France. Providers advertised their own services in their own publications, which helped market the overall Minitel network. Others founded newspapers solely to create Minitel services.

By 1988, three million terminals were installed, with 100,000 new units installed monthly. The telephone directory received 23 million calls monthly, with 40,000 updates daily. About 6,000 other services were available, with 250 added monthly. France Télécom estimated that almost 9 million terminals—including web-enabled personal computers (Windows, Mac OS, and Linux)—had access to the network at the end of 1999, and that it was used by 25 million people (of a total population of 60 million). Developed by 10,000 companies, in 1996, almost 26,000 different services were available.

Users first subscribed to individual services, but traffic grew quickly after the telephone company offered a "kiosk" model (named after newsagents' shops). Minitel and voice charges appeared combined on the monthly telephone bill, with no breakout of fees. Service providers received two-thirds of the US$10 an hour that customers typically paid as of 1988. As the telephone company handled bill collection, and users who did not pay bills lost telephone service, the customer acquisition cost for service providers was low. The single bill encouraged impulse shopping, in which users intending to use one service found and used others while browsing. As users' identities and services were anonymous, Minitel use was high at work where companies paid for telephone service.

The integrated electronics in a Minitel terminal has four functionally distinct parts

1. The subset visualization responsible for producing the TV images from the signals received by the Minitel or hit on the keyboard
2. The subset keymap loaded recognizes the keyboard and sends its code to the subset visualization and to the telephone line keys.
3. The subset serial interface is responsible for providing signals to the DIN socket (computer peripherals) to devices.
4. The MODEM (modulator-demodulator) that transforms internal digital signals Minitel

The keyboard of the Minitel is managed by an 8048 microprocessor at Intel. It is a circuit that performs several functions in one housing.

1. The heart of the microcontroller: the central processing unit or CPU of 8 bits
2. 64 bytes of RAM.
3. 1 KB of ROM.
4. An 8-bit timer counter
5. 27 lines of inputs/outputs.

Software integrated in the ROM 8048 provides scanning of 65 keys. The keystroke causes the production of a code or a code sequence corresponding to the character or indicated on this function. If two keys (or more) are simultaneously depressed, no action occurs. One of these keys will be taken into account as soon as the others are released. The 8048, with two inlets/outlets, will provide the determination of the key, is also responsible for the serialization code since there is no standard UART function integrated in the microcontroller, and the series is produced by the integrated software. The connection of the keyboard unit is via a six-pin connector carrying the power, mass, and the RESET signal issued by the serial data 8048.