TV Typewriter Cookbook - download pdf or read online

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29 The Intel 5101 is a premium micropower 2101 using CMOS tech­ nology. It is useful for nonvolatile memory systems using standby battery-power backup. SERIAL INTERFACE UARTS A UART, or universal asynchronous receiver transmitter, is used for serial-to-parallel and back again conversion to interface a serial­ operating device, such as a Teletype, a cassette storage system, or a modem, with the parallel input/ output lines of a tvt or a micro­ computer. The 1013 is a general instruments device. It is also available as a 1014 working off a single 5-V supply.

Since 32 words can be represented with binary combinations on five lines, this par­ ticular ROM has five input lines and eight output lines. There are 256 possible memory locations. At each and every location, we have the option of permanently or semipermanently placing a 1 or a 0. This leaves us with 2256 possible programs we can teach our ROM, an incredibly large number. The only thing that changes with a particular program is where you put the l's and O's. The rest of the circuit stays the same.

Consult individual data sheets for programming and erase information. The use of a programming machine or a program­ ming service is strongly recommended. Note that bulk uv erasure clears the entire dev ice . There is no means to correct a single-bit error, short of total erasure and reprogram­ ming. s. Power-supply current is 35 rnA from both supplies. 44 5600 PROGRAMMABLE READ-ONLY MEMORY (32 X 8, Bipolar, not Erasable) +·ENABLE TOP VIEW DATA OUTPUTS This is a nonvolatile memory that may be field-programmed to out­ put any of 32 words of eight bits each.

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