The 8259 A is contained in a 28 dual -in-line package that requires only +5V supply voltage. The 8259A is upward compatible with 8259. The main difference between the two is that the 8259A can be used with Intel 8086/8088 processor. It also in cludes additional features such as level triggered mode, buffered mode and
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8259 can be set up as master or slave by pin in non-buffered mode or by software if it is to be operated in the buffered mode of operation. 8259A PIC- CASCADE BUFFER/ COMPARATOR CAS 0-2 For master 8259 these pins are outputs and for slaves these are inputs. When 8259 is a master the CALL op-code is generated by master in response to the first
Slave program/Enable buffer (�𝐏/�𝑵): This pin is a dual function pin, when the 8259A is in buffered mode, this is an output that controls the data bus transceivers in a large microprocessor based system. When the 8259A is not in the buffered mode, this pin programs the device as a master (1) or a slave(0).
8259-Programmable Interrupt Controller (8259-PIC)
8259 Programmable Interrupt Controller - EEEGUIDE.COM Aug 22, 2018 8259 Interrupt Controller - LinkedIn SlideShare Dec 03, 2018 : how many priority modes are available in 8259? explain