By Virginia Williamson
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Extra info for Byte - March 1976
The transmitter portion of the UART is ideal for converting the parallel data to this ser ial format. Figure 1 is a circuit implementing such a converter or modulator. The ser ial output of the UART is said to be NRZ (non return to zero). It means that a logic one bit is a high level and a logic zero bit is a low level. A logic one causes the modulator to generate a 2400 hertz output signal and a logic ze ro generates a i200 hertz signal. Norm al output from the modulator is a string of sq uare waves.
Since a single address bus structure is used, both memory and peripheral devices reside in th e same address space. Only the user defined system address all ocation differentiates memory from 10 devices. No special input/output instructi ons are required since 10 data is manipul ated just like memory data using any of the 87 avail able, general purpose instructions shown in Tabl e 1. The basic instruction word format consists of 10 bits located in the lower order bit position s of a 16 bit processor word.
Th e cassette interface descr ibed in this arti cle is manufact u red by Pro ne tics Corpo ratio n. 5 in ch circuit card with connections through a sta nd ard du al 22 pin gold plated card edge co nn ecto r. Price, ava il abil ity, and ot her information may be obta in ed by writing: Pronetics Corporation, PO Bo x 28582, Dall as TX 75228. · 45 Microprocessor Update: The CP1600 is a co mpl ete, 16 bi t, single chip, MOS-LSI microprocessor avail abl e directly from General In strum ent for $99 in single quantity.
Byte - March 1976 by Virginia Williamson