Marius Posted October 31, 2021 Share Posted October 31, 2021 (edited) 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 October 31, 2021 by Marius typo Quote Link to comment Share on other sites More sharing options...
marauder666 Posted October 31, 2021 Share Posted October 31, 2021 On my 600XL with Lotharek simple stereo, and U1MB with FJC firmware, it works as expected. Different values for each paddle in both ports. Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted October 31, 2021 Share Posted October 31, 2021 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? Quote Link to comment Share on other sites More sharing options...
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