vectrex! Posted June 13, 2021 Share Posted June 13, 2021 Hello, I've got an Atari 800 that I've been trying to get working. Id like to try playing some games on it so I made myself an sio2pc cable. I've had no luck using that so I decided to test if the SIO port is even working. To test I'm just trying to print using the 820 printer. After typing Lprint "test" all I get is error code 138 which means device timeout. So far I've tried reseating all of the socketed chips, I've reflowed the solder joints to the SIO port, I've tested the cable and insured that it has continuity in all pins. Still the same error, Like there's nothing plugged in at all. Any help would be appreciated, thanks. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted June 13, 2021 Share Posted June 13, 2021 Could be a damaged POKEY or PIA chip. Quote Link to comment Share on other sites More sharing options...
+bob1200xl Posted June 14, 2021 Share Posted June 14, 2021 Does the 820 work in another 800 /XL...? Do you have any other SIO devices? Quote Link to comment Share on other sites More sharing options...
Rybags Posted June 14, 2021 Share Posted June 14, 2021 Only saw this here recently... I replied in the other one in programming. Additional to what I said there, I'd recommend also checking continuity from the relevant chip connections to the SIO pins for data in, data out and Command. Quote Link to comment Share on other sites More sharing options...
DavidMil Posted June 14, 2021 Share Posted June 14, 2021 Doesn't Best Elec. sell a SIO loop back tester? Seems like I remember seeing a design for one a long time ago. However, there was no software for it. If someone has the schematics I can build one and write the software. DavidMil Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted June 15, 2021 Share Posted June 15, 2021 9 hours ago, DavidMil said: Doesn't Best Elec. sell a SIO loop back tester? Seems like I remember seeing a design for one a long time ago. However, there was no software for it. If someone has the schematics I can build one and write the software. DavidMil Pretty sure the SALT/Super SALT carts test this. Quote Link to comment Share on other sites More sharing options...
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