Microwave and Radio-Based Systems by Regis Sbudd J. Bates

By Regis Sbudd J. Bates

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Serial video, ready for sync combination, appears as an output on pin 2. There are many use options. The line timing may be strobed into the chip by grounding pin 4 during the hold times. The ASCII char­ acter may be strobed into the chip by grounding pin 19. Lower­ case may be inhibited by making pin 18 positive. A positive input to pin 20 replaces the character with a cursor box. Access time is typically 750 ns. Power-supply current is 75 rnA. Note the unusual supply connections, particularly the ground on pin 24.

It converts these ASCII commands into the seven Selectric shift, rotate, and tilt ball commands. The program appears in Table 3-2. We have shown it in octal coding to make it more compact. Most of the characters are directly converted from ASCII to their Selectric equivalents. ASCII < and > become the Selectric 1/2 and %, respectively, the ASCII ""-becomes the Selectric ¢, and opening and closing brackets are disallowed and produce question marks. ASCII t become a capital "E" to indicate exponentiation, particu­ larly when you are using the Basic language on a computer display.

Outputs can normally drive 10 TTL loads. There are two types of outputs, again depending on the manufac­ turer and part number. An open circuit output needs a pull-up resis­ tor and can drive either TTL or CMOS loads. 2K to drive CMOS loads. Pin 15 will allow the memory to function when it is grounded and will provide an open-circuited or a tri-state high-impedance output when positive. Any number of outputs can be paralleled, provided only one chip is enabled at a time. When open collector devices are used, only one pull-up resistor is needed for each set of paralleled outputs.

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