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Marius

Problems with Paddles (and touch tablet XC77)

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Hi all,

 

In my Stereo 800XL (Stereo upgrade Lotharek) I have a very odd problem. On the 800XL port 1, the Paddles, and the touchtablet have both x and y movement the same output.

 

So in a basic program:

 

10 PRINT PADDLE(0), PADDLE(1):RUN

 

The result of PADDLE(0) and PADDLE(1) are the same at the same time, no matter whether I turn the knob on the left OR right paddle. Both values increase and decrease at the same time. 

 

When I attach the same paddles to the 800XL port 2 and I change the basic program into this:

10 PRINT PADDLE(2), PADDLE(3):RUN
 

Then the problem does not occur, and both paddles result their own value separately.

So the question here is:

Who can test this for me on their 800XL with Stereo upgrade? 
The 800XL also has an Ultimate Upgrade with BIOS by @flashjazzcat but I can not imagine this has something to do with it.

 

Normally I would swap the pokeys, but this atari has been opened and closed so many times, that I am a bit cautious in doing. So if someone else can confirm that there is also a problem with the paddles (or touchtable) on their XL computer on PORT 1, I would be pleased to hear. 

 

It did not matter when I switched the Stereo to MONO setting.

 


 

Edited by Marius
typo

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On my 600XL with Lotharek simple stereo, and U1MB with FJC firmware, it works as expected.  Different values for each paddle in both ports.

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2 hours ago, Marius said:

So in a basic program:

 

10 PRINT PADDLE(0), PADDLE(1):RUN

 

The result of PADDLE(0) and PADDLE(1) are the same at the same time, no matter whether I turn the knob on the left OR right paddle. Both values increase and decrease at the same time. 

 

When I attach the same paddles to the 800XL port 2 and I change the basic program into this:

10 PRINT PADDLE(2), PADDLE(3):RUN
 

Then the problem does not occur, and both paddles result their own value separately.

Can you check, if there is (or not) a short between pins 14 and 15 on the main POKEY chip?

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