Boots – shoes – and leggings
Patent
1976-11-26
1978-09-19
Thomas, James D.
Boots, shoes, and leggings
340147R, G06F 304
Patent
active
041158563
ABSTRACT:
An interface connects a data processing unit to at least one working stat including data transmitting and receiving devices, such as peripheral devices. The interface includes a transmitter/receiver circuit for a station at the unit and a transmitter/receiver circuit associated with each of the devices. Data are transmitted between the circuit at the unit and the circuit at the device by a pair of transmission lines, whereby data are exchanged between the unit and the devices sequentially, character by character. Each of the characters is formed by the sequential transmission of bits along the lines. A dialogueing sequence between the unit and one of the devices is initiated when a first character is derived from the unit transmitter/receiver circuit. Each first character has a first predetermined bit having a predetermined value to indicate that the character is a first character, several bits for indicating an address of a transmitter/receiver circuit associated with each device connected to the unit, and a further predetermined bit having first and second values respectively indicative of single and multiple mode operation of the addressed transmitter/receiver circuit. The addressed circuit, when activated to the single mode, establishes a transmitting and receiving dialogue between the unit and only one device connected to the addressed transmitter and receiver circuit. In the multiple mode a pair of device transmitter/receiver circuits are addressed by two first characters having one sequence such that the device connected to one of the circuits is a transmitter and the device connected to the other circuit is a receiver. A dialogue is thereby established between the two devices through the data processing unit without using a large amount of memory space in the unit.
REFERENCES:
patent: 3697959 (1972-10-01), Abramson
patent: 3725871 (1973-04-01), Heuttner
patent: 3924240 (1975-12-01), Given
patent: 4024505 (1977-05-01), Sperling
Hostein Claude
Labeye-Voisin Gerard Francois
Compagnie Internationale pour l'Informatique Cii Honeywell Bull
Thomas James D.
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