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The Bell DataPhone 300 used the same protocol as the Bell 103. This modem is from 1978. The Bell 103 modem or Bell 103 dataset was the second commercial modem for computers, released by AT&T Corporation in 1963. [1] [2] It allowed digital data to be transmitted over regular unconditioned telephone lines at a speed of 300 bits per second.
Processor read/write scratch memory (called CALL STORE) was implemented using a magnetic core variant called Ferrite Sheet. Program and Data Store (used to store Software and infrequently changed data) was implemented using a technology called piggy back twistor - in modern parlance a write once, read many times non-volatile memory system).
Triphenyl tetrazolium chloride (TTC), or simply tetrazolium chloride (with the formula 2,3,5-triphenyl-2H-tetrazolium chloride) is a redox indicator commonly used in biochemical experiments especially to indicate cellular respiration. It is a white crystalline powder, soluble in water, ethanol and acetone but insoluble in ether.
The Toronto Transit Commission (TTC) is the primary public transport agency in Toronto, Ontario, Canada, operating the majority of the city's bus and rail services. It is the oldest and largest of the urban transit service providers in the Greater Toronto Area, with numerous connections to systems serving its surrounding municipalities.
In 2011, the provincial government passed the Toronto Transit Commission Labour Disputes Resolution Act (a.k.a. the TTC Act) to prohibit TTC strikes because the TTC was considered to be an essential service. However, in 2023, an Ontario Superior Court judge ruled that the act was unconstitutional as the government failed to show why the TTC is ...
IEC 103 uses FT1.2 (defined in IEC 60870-5-1) for frame format having options of Frame with variable length, Frame with fixed length & single character similar to IEC 101. Single character is used for acknowledgments, fixed length frames are used for commands & variable lengths are used for sending data.
All types have a maximum collector current of 100 mA, except that the original Philips tentative data dated 4.4.1966 specified a maximum collector current of 100 mA peak (I CM) for the BC107/8/9, and Telefunken originally specified a maximum collector current of 50 mA for the BC109, but since at least 1973 all have revised collector currents of 100 mA average or 200 mA peak, except that the ...
Contactless ICs that comply with parts 3 and 4 of ISO/IEC 14443-4 Type A with a mask-ROM operating system from NXP. The DES in the name refers to the use of a DES, two-key 3DES, three-key 3DES and AES encryption; while Fire is an acronym for Fast, innovative, reliable, and enhanced.