Download The Z-80 Microcomputer Handbook by William T. Barden PDF

By William T. Barden

Booklet via Barden, William J.

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Extra info for The Z-80 Microcomputer Handbook

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The Page Registers can then be manipulated by the Operating System using orders which do not involve the Queue, or, if a process change is required, the whole of the Queue and its associated buffer registers can be preserved (for subsequent restoration) in the store, thereby unblocking the Queue and allowing other processes to be run. The inclusion of a Queue in the design generates additional problems because of the different types of operand to be sent to the A-unit. ACC orders using named variables are ready for execution at the end of PROP, but since orders must be obeyed in correct program sequence, they cannot be allowed to overtake ACC orders awaiting secondary operands.

3 ECL Circuits More complex functions are obtained by joining the collectors of the reference transistors of two or more basic gate circui ts together and inserting an additional transistor as a diode across the common load resistor to limit the voltage drop. 4(a)-(d). 5. If the CLOCK and GATE signals are both held at logic 1, then the SET/RE-SET inputs are locked out and the output follows the DATA input. When CLOCK and GATE become 0, the output remains static, independent of DATA, but can be changed by application of SET or RE-SET.

Word 1, which is identical to the interrogate word, has no current flowing, and word 2 has one unit of current flowing. Equivalence is therefore recognised by the absence of current in a Word Line. 8 Model of an Associative Memory Matrix The associative memory matrix used in the MU5 associative stores is described in detail in [8]. Each matrix consists of eight elements arranged as four words of two bits within one integrated circuit, and four such circuits are mounted on one module to form an 8-word by 4-bit array.

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