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mro83
Joined: 06 Oct 2004
Posts: 227
Helped: 18
Location: Mashad
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 02 Jan 2005 22:03 keyboard interface to 8086 |
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hi to all
I want to interface a keyboard (preferrably an AT type) to 8086 or z80 microprocessor. connection is serial and i might use an interface ic such as 8255.
i will be pleased if anyone can help me with his instructions about timing, interface ic, asm program needed &etc.
cheers.
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checkmate
Joined: 25 Feb 2004
Posts: 489
Helped: 35
Location: Toilet Seat
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| 02 Jan 2005 23:08 Re: keyboard interface to 8086 |
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| The standard AT keyboard uses a serial protocol. No interface ICs are required other than the standard 8255. www.beyondlogic.org gives a pretty complete description of the protocol and connections.
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IanP
Joined: 05 Oct 2004
Posts: 6346
Helped: 1505
Location: West Coast
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| 03 Jan 2005 2:33 Re: keyboard interface to 8086 |
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Here is another example from Philips. This one is closer to 80-families and also includes all look-up tables. You can easily identify sections of code that will be useless for you (I2C subroutines for example).
http://www.semiconductors.philips.com/acrobat_download/applicationnotes/AN434.pdf
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