Re: joystick ports

From: Julian Perry <>
Date: Mon, 9 Sep 2013 00:16:59 +1000
Message-ID: <>
Just a couple of clarifications.
My reference to the 6522/6526 timers referred to timers restarting,
or latches containing data being cleared once read.
I was NOT referring to anything sitting on a data buss somewhere
affecting their operation. (it's late here, that's my excuse!)


Monday, September 9, 2013, 12:07:30 AM, you wrote:

> Gerrit, HÁRSFALVI.

> Thanks both for your explanations - I'm getting there, I think.

> From what I gather:
> When a WRITE is written to the TED keyboard latch, during the same 1/2
> cycle that the CPU has the buss (and Data is still valid), the TED
> latches the contents of the TED input keyboard port. The actual BYTE
> written is not looked at by the TED - it is only used to assert the
> appropriate signals on the data buss (in the same way 6522/6526
> timers are (re)started by a read.)

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Received on 2013-09-08 15:01:14

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