hueyjones70 Posted March 24, 2023 Share Posted March 24, 2023 My 1200XL has suddenly developed boot problems. If I insert a cart and turn the computer on, I get a buzz like the one you would get if you were trying to load a cassette. Occasionally, the cart will boot but not very often. Also, If I press option and turn the computer on, it shows the Self Test screen as it should. If I press select, the self test jumps to the audio voice test. If I press help, the self test menu screen flashes for a split second and the computer goes directly to the memory test. This computer has the 800XL/OnniviewXL operating system and a BASIC chip. I haven't taken it apart to see if the OS chip has gone bad or if maybe SALLY is acting up. Quote Link to comment Share on other sites More sharing options...
ACML Posted March 24, 2023 Share Posted March 24, 2023 Can you get the ROM/RAM self test to run (800XL OS)? If so, and the two ROM bars are green, it's probably elsewhere. Is your SALLY a Rockwell (-12)? If so and you have a non Rockwell SALLY, try the swap and see if that works. This past 18 months, I've had to replace two Rockwell SALLYs because of booting issues with cartridges. Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted March 24, 2023 Share Posted March 24, 2023 If it's not the CPU, that leaves the keyboard, it's matrix chips and the Console key selection to Pokey, PIA, MMU/emmu in that order to check Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted March 24, 2023 Author Share Posted March 24, 2023 The two ROM/Ram bars are green. Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted March 24, 2023 Author Share Posted March 24, 2023 After the RAM test completes, the program stops. I just tried a couple of things and this time Ms PAC MAN, SPACE INVADERS, AND MINER 2049ER all loaded. POLE POSITION would not boot. I loaded my ATARIWRITER PLUS 80 column version and it loaded the menu screen but would not respond to any other inputs. I loaded DOS 2.5, got a menu screen and tried to load a program; got a "file not found" error. Tried to get a disk directory and I got a row of hearts. I have a 512K memory upgrade v 4.5 installed. Quote Link to comment Share on other sites More sharing options...
Havok69 Posted March 24, 2023 Share Posted March 24, 2023 First thing I would do is put it back to stock. If the problem persists, follow the doctor's orders... Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted March 28, 2023 Author Share Posted March 28, 2023 After taking the 1200XL apart, I noticed that the chroma wire from my UAV was under the shield and had a spot where the insulation had worn through. This will require more testing but so far all of the boot issues have disappeared. 1 Quote Link to comment Share on other sites More sharing options...
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