Talk:83Plus:Ports:3A

Hi guys,

Does anyone have even the faintest clue what this port is about? I've been having some issues with usb8x working on my 84P Black and not working on my 84P Silver. One of the few differences between the two is that my 84P Black has boot version 1.02 (as opposed to 1.00). There's some USB code (in the 1.02 boot) that checks port 3A and branches depending on the value of bit 3, which is 1 on my 84P Silver and 0 on the Black. I'm trying to figure out if this is a software issue or a hardware issue. Any insights would make you a hero.

Also, does anyone have an 84P Black with boot other than 1.02 or 84P Silver with boot other than 1.00? If so, what is the value read from port 3A?

Thanks --Dan Englender 15:01, 7 September 2006 (PDT)

Someone with an 84P Silver calc with 1.02 boot just tested and the value of port 3A is 0 on his calculator as well. So either there's a hardware difference (which I'm guessing is the most likely explanation) which 1.02 was meant to handle, or the boot code does something differently on 1.02 which causes the different value on port 3A. Either way, I still have no idea what it means. --Dan Englender 15:20, 7 September 2006 (PDT)