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xlar54
 Post subject: Noob on 6522
PostPosted: Mon Aug 16, 2021 12:42 pm 
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Posts: 28
Can someone explain how to use the 6522 to a noob like me? Not exactly sure what it does and how it works.
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BigEd
 Post subject: Re: Noob on 6522
PostPosted: Mon Aug 16, 2021 1:10 pm 
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Garth's primer is often a good place to start, in this case perhaps at
https://wilsonminesco.com/6502primer/IO_ICs.html

You'll notice it points you to the datasheets - always a good idea to have a datasheet in front of you, and to have familiarised yourself with it.

And, he notes that his Tip of the Day topic mentions many 6522 tricks:
viewtopic.php?f=7&t=342
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BigDumbDinosaur
 Post subject: Re: Noob on 6522
PostPosted: Mon Aug 16, 2021 3:12 pm 
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xlar54 wrote:
Can someone explain how to use the 6522 to a noob like me? Not exactly sure what it does and how it works.

The 6522 (or 65C22, the current incarnation) is a general-purpose I/O device, incorporating two parallel I/O registers, one serial I/O register, two precision timers, and various control and status registers. Some of the possible uses of this device are:

  • Drive a Centronics printer.

  • Generate discrete outputs that can control a machine, turn on/off "lights" (LEDS, for example), start the morning coffee, etc.

  • Transfer data to/from another computer.

  • Act as an input or output to a MIDI device.

  • Acquire data for scientific purposes.

  • Accurately time events and cause the computer to do something at a certain point in time.

The site Ed referred you to can give you many more ideas. As always, the data sheet is your friend.

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xlar54
 Post subject: Re: Noob on 6522
PostPosted: Mon Aug 16, 2021 3:38 pm 
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Joined: Wed Oct 18, 2017 1:26 am
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Thanks. I will admit much of this is above my head right now, so even the datasheet isnt very helpful. But not giving up. Thanks for the replies!
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BigEd
 Post subject: Re: Noob on 6522
PostPosted: Mon Aug 16, 2021 4:24 pm 
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Location: England
You might find good explanations in a nice old book about 6502 interfacing, for example on the Internet Archive...

Programming & interfacing the 6502, with experiments by De Jong, Marvin L
Programming the 6502 by Zaks, Rodnay
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gfoot
 Post subject: Re: Noob on 6522
PostPosted: Mon Aug 16, 2021 6:22 pm 
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Joined: Fri Jul 09, 2021 10:12 pm
Posts: 741
I'd suggest you focus on one bit of it at a time, don't try to learn it all at once. You could play with the timers for example, or the I/O ports, whatever you fancy - but you only really need to understand how each subsystem works independently for most things.
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GARTHWILSON
 Post subject: Re: Noob on 6522
PostPosted: Mon Feb 07, 2022 6:24 am 
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Joined: Fri Aug 30, 2002 1:09 am
Posts: 8546
Location: Southern California
xlar54, are you making progress?

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
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