Date   : Mon, 18 Sep 2006 11:16:51 +1000
From   : "Bob Devries" <bdevries@...>
Subject: Re: AMX mouse wiring

Regardsless of which numbering convention you use, I have the wiring done 
correctly according to information I have gleaned from websites:
+5V goes to mouse pin 7
0V to pin 8
CB1 to pin 4 (mouse Hquadrature)
CB2 to pin 3 (mouse Vquadrature)
D0 to pin 2 (mouse H)
D1 to pin 1 (mouse V)
D5 to pin 6 (left mouse button)
D6 to pin 5 (middle mouse button)
D7 to pin 9 (right mouse button)

The buttons work fine, but the horizontal direction is reversed, and the 
vertical direction only goes one way towards the top of the screen.

My guess is that the information I have is somehow incorrect, but where do I 
find a reliable connection diagram?

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Philip Pemberton" <philpem@...          >
To: <bbc-micro@...         >
Sent: Saturday, September 16, 2006 8:07 PM
Subject: Re: [BBC-Micro] AMX mouse wiring


> Bob Devries wrote:
>> More info on my mouse problem:
>> I swapped the two VIA chips, and found no difference.
>> The BBC in question has a Revision 4 motherboard. It is fitted with the 
>> 8271 floppy disc controller, and the speech chips, but no econet.
>> I hope I have the correct pinout for the user port Pin 1 is at the east 
>> side and the pins number 1 to 10 along the north edge, and then 11 to 20 
>> starting at the pin 1 end again. If this is not correct, please let me 
>> know.
>
> That pin numbering scheme is completely wrong.
> IDC connectors are numbered like this:
>
>   1 3 5 7 9 11 .... 19
>          +---+
> +--------+   +--------+
> | o o o o o o o o o o |
> | o o o o o o o o o o |
> +---------------------+
>   2 4 6 8 10 ...... 20
>
> The little arrow on the connector denotes pin one -- normally the red line 
> on the cable. If you pull the back off the connector (assuming you've got 
> an uncrimped one), you'll notice that the pins are interleaved. Near the 
> arrow, there will be one pin that's closest to the outside of the 
> plastic - that's the IDC tag for pin one. Pin two is the one below it, 
> about 0.05" (1.27mm) to the right. Pin three is then on the same row as 
> pin one, 0.05" further along than pin two. This continues to the edge of 
> the connector.
>
> Thanks.
> -- 
> Phil.                         |  (\_/)  This is Bunny. Copy and paste 
> Bunny
> philpem@...                   | (='.'=) into your signature to help him 
> gain
> http://www.philpem.me.uk/     | (")_(") world domination.
>
>
>
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