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Re: I/O with the 1802

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  • jdrose_8_bit
    Very impressive. With a few A/D port circuits the 1802 could be a microcontroller that could easily do the job that moderm 8 bit microcontrollers do. I am
    Message 1 of 9 , Mar 8 4:31 AM
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      Very impressive.

      With a few A/D port circuits the 1802 could be a microcontroller that could easily do the job that moderm 8 bit microcontrollers do.

      I am impressed by the 1802's built-I/O and DMA capability. Very forward thinking for it's time.

      --- In cosmacelf@yahoogroups.com, rileym65 <no_reply@...> wrote:
      >
      > You can do something similar to what I did here:
      >
      > http://elf-emulation.com/hardware/portExtender.html
      >
      > My IDE interface also uses a similar technique. Essentially you need to i/o operations for each real i/o. First to set the port you want to read/write, and then another to actually read/write the selected port.
      >
      > Mike
      >
      >
      > --- In cosmacelf@yahoogroups.com, ruud@ wrote:
      > >
      > > Hallo allemaal,
      > >
      > >
      > > I'm studying the ML of the 1802 and I have a question about its I/O
      > > capabilities. For I/O hardware operations you have to use the
      > > outputs N0, N1 and N2. But that means you only have a range of eight
      > > bytes. If you want to use a keyboard, LPT-port, harddisk etc. etc.
      > > eight bytes is much too less.
      > > The only other thing I can think of is the use of memory mapped I/O.
      > > Unless I missed something.
      > >
      > > Any comment is welcome!
      > >
      > >
      > > Met vriendelijke groet / kind regards, Ruud Baltissen
      > >
      >
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