256 colors Posted June 12, 2018 Share Posted June 12, 2018 I bought a 800XL from eBay with this switch from left to right in 3 positions i get 1st position 64XL with blue ready screen which pass all the tests for ram/sound/keyboard all okay 2nd position i get ether a red or yellow blank screen 3rd position i get black screen with i can type text on too I'm guessing the switch is for xl/os b/os a in that order am i doing something or does the switch job sound like it's been botched job? Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted June 12, 2018 Share Posted June 12, 2018 (edited) Sounds line a common switch between 2 OS ROM's. Usually between the stock XL OS, and the other for compatibility with 800 OSb. Sounds like yours has a 3 position switch, where the centre position is not connected. red/yellow screen is a common symptom of a missing/bad OS ROM, which the centre position would simulate. Inside I expect you would see a 2nd chip soldered on top of the first. With the switches' wires connected to the power pins of each. I don't immediately recall a particular OS that used a black background. Maybe you could run a utility to dump the OS to a file, and upload here... Edited June 12, 2018 by Nezgar 1 Quote Link to comment Share on other sites More sharing options...
256 colors Posted June 12, 2018 Author Share Posted June 12, 2018 Sounds line a common switch between 2 OS ROM's. Usually between the stock XL OS, and the other for compatibility with 800 OSb. Sounds like yours has a 3 position switch, where the centre position is not connected. red/yellow screen is a common symptom of a missing/bad OS ROM, which the centre position would simulate. Inside I expect you would see a 2nd chip soldered on top of the first. With the switches' wires connected to the power pins of each. I don't immediately recall a particular OS that used a black background. Maybe you could run a utility to dump the OS to a file, and upload here... Okay thank you i not able to do any more tests as it's a bare bones setup at the moment with only 800XL/Atari power supply/RF cable/joystick and no software I've yet to add a 1010 or a 1050 with replacement power supply so I'm quite limited to what i can do Quote Link to comment Share on other sites More sharing options...
BillC Posted June 12, 2018 Share Posted June 12, 2018 Sounds line a common switch between 2 OS ROM's. Usually between the stock XL OS, and the other for compatibility with 800 OSb. Sounds like yours has a 3 position switch, where the centre position is not connected. red/yellow screen is a common symptom of a missing/bad OS ROM, which the centre position would simulate. Inside I expect you would see a 2nd chip soldered on top of the first. With the switches' wires connected to the power pins of each. I don't immediately recall a particular OS that used a black background. Maybe you could run a utility to dump the OS to a file, and upload here... This machine could have a RamrodXL which has sockets for 3 individual OS chips, this upgrade uses a 3-position switch to select the active OS. 1 Quote Link to comment Share on other sites More sharing options...
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