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urgent! Does anyone know 26-pin or 40-pin 8255??

Former Member

hi, i'm doing a project and need a 26-pin 8255 microprocessor(i'm not sure whether its called "microprocessor") i tried many method but still cannot find it. Does anyone know any information about it!!!?

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  • Hi,

     

    The 8255 was indeed a parallel port for Intel and came in a 40 pin DIP package.  Yes I do have some and they may still work.  There was a serial port chip, the 8251 which was 24 pins in the same era.

    There were a bunch of micro-controllers in that era that combined a 8085 MCU with integrated serial I/O and parallel I/O, but most of them were 40 pin packages.  If you can clarify your requirements, I might be able to find you both chips and pinouts.

    Thanks,

    DAB

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  • Hi,

     

    The 8255 was indeed a parallel port for Intel and came in a 40 pin DIP package.  Yes I do have some and they may still work.  There was a serial port chip, the 8251 which was 24 pins in the same era.

    There were a bunch of micro-controllers in that era that combined a 8085 MCU with integrated serial I/O and parallel I/O, but most of them were 40 pin packages.  If you can clarify your requirements, I might be able to find you both chips and pinouts.

    Thanks,

    DAB

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