Re: Help with SX64 User Port?

From: HÁRSFALVI Levente <publicmailbox_at_harsfalvi.net>
Date: Mon, 26 Oct 2015 23:09:54 +0100
Message-ID: <562EA4B2.3020502@harsfalvi.net>
The 4066 merely contains CMOS transfer gates - that is, simple switches 
whose series resistances (when open) are in the order of some 1-200 
ohms. There are no buffers in the 4066. In the theoretical experiment 
below, the open 4066 gate could just be substituted by a regular 1..200 
ohm resistor.


On 2015-10-26 22:03, Leif Bloomquist wrote:
> What happens if both sides of a 4066 channel are connected to an
> output though?   (since it's possible to configure both the Arduino
> and CIA as outputs).
>
>
>
> On Sun, Oct 25, 2015 at 1:17 PM, Gerrit Heitsch
> <gerrit@laosinh.s.bawue.de> wrote:
>> On 10/25/2015 06:05 PM, Leif Bloomquist wrote:
>>>
>>>
>>> I looked into buffers but was unable to find a through-hole
>>> *bidirectional* buffer, so I'll stick with this approach unless
>>> someone has a different solution?
>>
>>
>> How about a 4066? Yes, it's a switch, but if you just tie the Enable signal
>> to +5V it becomes a buffer. If it's fast enough for controlling access to
>> the color RAM in the C64, it should be fast enough anything I/O-related.
>>
>>   Gerrit
>>
>>
>>
>>
>>        Message was sent through the cbm-hackers mailing list
>
>         Message was sent through the cbm-hackers mailing list
>


       Message was sent through the cbm-hackers mailing list
Received on 2015-10-26 23:00:08

Archive generated by hypermail 2.2.0.