By Virginia Williamson
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Extra info for Byte - August 1976
In mode 1, the processor will respond to an interrupt by executing a restart to location 0056. The response in this mode is similar to the response to a nonmaskable interrupt except for the restart location . 38 What does the Z80 have going for it? It's easy to interface; one chip does the job of several 8080A family chips. It's as easy, if not easier, to design an entire system around than any other microprocessor on the market today, and the Z80 is software compatible with the 8080A, the most widely used and known 8 bit microprocessor.
Active low . WR indicates that the processor data bus holds valid data to be stored in the addressed memory or 10 device . RFSH (Refresh) Output, active low. RFSH indicates that the lower 7 bits of the address bus contain a refresh address for dynamic memories and the current MREO signal should be used to do a refresh read to all dynamic memories. HALT (Halt state) Output, active low. HALT indicates that the processor has executed a HALT software instruction and is awaiting either a non maskable or a maskable interrupt (with the mask enabled) before operation can resume.
It will then send the BAUDOT code for the character in bit positions B5 through BO of OUTPUT PORT 10. Bit B5 will serve to indicate to the BAUDOT interface whether A square or rectangel may be used to denote a general or specific operation. The type of operation may be described inside the box such as illustrated in the following examples. NO ICLEAR THE ACCUMULATORI GET ASCII CHARACTER FROM INPUT PORT 00 SEND A LOGIC '1' ON BO OF OUTPUT PORT 11 TO CLEAR THE ASCII INTERFACE A diamond form may be used to symbolize a decision or branching point in a program.
Byte - August 1976 by Virginia Williamson