Caple C871i Manual do Utilizador descarregar pdf (Página 213)

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Apple II Computer Info

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From: Erick Wagner <[email protected]>

Newsgroups: comp.sys.apple2.programmer

Subject: Re: Q: I/O 32 card from Applied Engineering

Date: 5 Dec 1995 15:53:02 GMT

Organization: PRC

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Recently Dave Lyons and John Bowling asked about the AE I/O 32 card.

I sent Dave some info via email but thought I should post so others

could benefit from it too.

>I suspect that the AE card used a couple of 6522's

Good guess but wrong :) AE used a pair of Motorola 6821 chips.

MicroDimensions also used the 6821 chip in at least one of their

I/O boards and the John Bell Engineering board uses the 6522. If you

have a choice over which I/O to use, I'd lean towards the 6522. It

seems to be a little more straightforward in terms of setting it up

for I/O and it has some wonderful built-in timers that can prevent

you from writing some fairly complex code.

Well, here's the info I sent to Dave:

======================================

Applied Engineering I/O 32 Information

======================================

If a bit in the Data Direction Register is 1, the

corresponding bit of the Port is an output; otherwise,

it is an input.

The procedure for writing to an output is:

(1) Write a 0 to bit 2 of the Control Register

(2) Write 1's to the Data Direction Register of each

output bit

(3) Write a 1 to bit 2 of the Control Register

(4) Write data to the Port

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 213 of 572

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