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How to connect an IO device to a 8086 CPU

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khorram

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Hi everyone,

Please let me know how i can connect an IO device to a 8086 CPU without PIC 8259. Is it possible? If so, how interrupt vector number should be determined for the CPU?

regards,
khorram
 

Sure it is possible to connect an I/O device to the 8086 CPU without PIC. U need buffers (like 74245) and latches (like 74373). U dont essentially need to use the interrupt vector table unless u have a HUGE task to perform. Simple IN and OUT instructions can be used to move data from I/O devices
 

Hi,

You can also use a dedicated chip, the 8255 PPI :

h**p://support.intel.com/design/archives/periphrl/docs/7190.htm

h**p://support.intel.com/design/archives/periphrl/docs/7012.htm

Datasheet :

h**p://support.intel.com/design/archives/periphrl/docs/23125604.htm

Repkace * by t
 

you can connect an IO device to the 8086 CPU by using both the 8255 and 74244 ICs.
the 8255 is a three port I/O controller designed for 8086 systems, it is connected to the databus and control bus of the 8086, it contains three controlable ports(A,B,C) that can be programmed -each- either as an input or output.
the 74244 is buffer line IC that is used to catch readings and latch it till it is required.
 

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