npturton Posted September 13, 2015 Share Posted September 13, 2015 Ive just got myself a 1200XL and im puzzled as the L1 and L2 LED alternate Any Ideas PS also got myself a 7800 as well, the collection continues ) Quote Link to comment Share on other sites More sharing options...
Rybags Posted September 13, 2015 Share Posted September 13, 2015 The IO PORTB bits that were used for joysticks 3 and 4 were reassigned for memory management and the LEDs on the 1200XL. On later machines the bits are used exclusively for memory management. If they alternate without user input on a 1200XL it might mean you have a memory expansion beyond 64K inside the machine. If you can download and run software then try some of the SysInfo or MemTest programs. Quote Link to comment Share on other sites More sharing options...
npturton Posted September 13, 2015 Author Share Posted September 13, 2015 Thanks Rybags The 1200XL is a mystery to me, ive been after one for ages, just tested it with some carts and already got my 8 year old hooked. Even the PSU connector is the one from the 400/800/1050. Ive got tons of stuff and still struggling to get it set up I connected to my 32" LED Toshiba TV as well via RCA and after a bit of playing Ive got the picture perfect Quote Link to comment Share on other sites More sharing options...
ACML Posted September 13, 2015 Share Posted September 13, 2015 Ive just got myself a 1200XL and im puzzled as the L1 and L2 LED alternate Any Ideas PS also got myself a 7800 as well, the collection continues ) If you are referring to L1 and L2 alternating during the ROM/RAM memory check, that it normal. The L1 and L2 LEDS will alternate when even and odd "K" RAM is tested. They have other functions when not in test. I think one signifies the international character set and the other is Keyboard disabled. Quote Link to comment Share on other sites More sharing options...
Bryan Posted September 13, 2015 Share Posted September 13, 2015 I think I remember a game that flashed the lights... Lode Runner? Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted September 13, 2015 Share Posted September 13, 2015 Bank switched XE carts, such as Mario Bros., Kareteka, and a few others will trigger the lights. Ram upgrades too. Space harrier on a 8mb cart will set them off as well. Quote Link to comment Share on other sites More sharing options...
Mathy Posted September 13, 2015 Share Posted September 13, 2015 Hello guys I think one signifies the international character set and the other is Keyboard disabled. LED 2 and LED 1 respectively, according to Appendix 12 of Mapping the Atari, revised edition. Sincerely Mathy Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted September 13, 2015 Share Posted September 13, 2015 Why would a bank switched cart affect the LEDs, unless software on said cart actually writes to PORTB? Quote Link to comment Share on other sites More sharing options...
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