• It is available in 5 MH, 8MHz and 10 MHz.
• It can operate in two modes, i.e. single processor (minimum mode) or multiprocessor moth (maximum mode) configuration.
• The signals are categorized in three groups as follows
(i) Common signal, which are used in minimum as well as maximum mode
(ii) Signal for minimum mode
(iii) Signals for maximum mode.
• The pin diagram for 8086 processor is shown in fig.
• The signals common for both maximum & minimum modes are:
Pin From 24 to 31 in Minimum Mode:
INTA (Interrupt Acknowledge) Output: This indicates recognition of an interrupt request.
HOLD input, HLDA output:
• A HIGH on HOLD pin indicates that another master (DMA) is requesting to take over the system bus.
• On receiving HOLD signal processor outputs HLDA signal HIGH as an acknowledgment.
• At the same time, processor tristates the system bus.
• A low on HOLD gives the system bus control back to the processor. Processor then outputs low signal on HLDA.
Pin Definitions (24 to 31) In Maximum Mode:
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