reifsnyderb Posted September 19, 2023 Author Share Posted September 19, 2023 After looking at the schematics, this board should work for either a 400 or 800. A 400 will have R4 and R5 installed and the programing of U1 will be different from the 800. An 800 will still need a jumper board, of course. 🙂 I'll order these once I am low on stock of either the 400 or 800 boards. I'll have to put a sticker on the board to indicate which Atari the board is configured for. 2 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted September 20, 2023 Author Share Posted September 20, 2023 (edited) Presently, I have 4 different boards to keep in stock for the Atari 400's and 800's. Each computer has slightly different select lines going to the socket and the 48k boards are essentially stripped down 1056k boards. It would be ideal if a single board could be used and just re-configured for any use. So, here it is: To use as a 48k board, only U10, C10, U1, and C1 are needed. In U1, a 20 pin ATF16V8 would be installed and it's programming would dictate as to whether it was for a 400 or 800. The solder jumper would be set to 48 so as to be able to use the ATF16V8. For a 1056 board, all components are required, the solder jumper would be set to 1056, and a ATF20V10 would be installed in U1. Once again, the programming of U1 would dictate as to whether it was for a 400 or 800. I am looking forward to trying this one out. 🙂 Edit to add: R4 and R5 are needed for Atari 400's. Edited September 20, 2023 by reifsnyderb 8 Quote Link to comment Share on other sites More sharing options...
invisible kid Posted September 20, 2023 Share Posted September 20, 2023 Awesome! Nice work. 1 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted January 17 Author Share Posted January 17 I am almost out of glue logic Atari 400 48k cards. But, that's not a problem anymore. 2 Quote Link to comment Share on other sites More sharing options...
+scorpio_ny Posted January 17 Share Posted January 17 It is nice to see that the Atari 400 getting some attention. I have one of your earlier memory boards and Svideo personality card in mine. Works great! 1 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted January 18 Author Share Posted January 18 11 hours ago, scorpio_ny said: It is nice to see that the Atari 400 getting some attention. I have one of your earlier memory boards and Svideo personality card in mine. Works great! It's good to hear your boards are working great! 🙂 When upgraded, the 400 had a lot of capability. Quote Link to comment Share on other sites More sharing options...
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