I also got into a state where the arrow keys did nothing. But after a reset, they worked again. Another time I got into a state where left arrow would type +, right arrow would type *, up arrow would type slash, and down arrow would type =. I think maybe I got this to happen by holding down the arrow keys until the key repeat action kicked in, but not sure.

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I'm trying to reproduce this and the capslock one, and can't at the moment. It may be related to the keyboard and the keyboard generated autorepeat stuff. I'll try to get some additional ps2 keyboards to test with.

The capslock one, I can see that happening if a key down/up event was missed somewhere along the way. Actually, holding down capslock with other keys pressed might cause it, the pre-ADB keyboard buffer is shallow and might be fixed with using the buffering I'm using with the ADB keyboard.

You can make the code if using a keyboard AND mouse with the adapter, to send a Control-click with the right click

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Yeah, I've thought about doing this and some other fancy stuff, particularly when enabling the PS2 intellimouse extensions for the scrollwheel and extra buttons, then you can use the extra buttons for all kinds of crazy macros and the scroll wheel for arrow up/down or page up/down. Then the next step is a macos control panel to customize those, which then gets into other issues.

At this point, a grand total of 5 people in the universe have these (6 tomorrow, if USPS doesn't mess it up even more), I've only heard from BMOW, and there's a laundry list of things to look at. So, I'd like to focus on those before getting too far ahead on macros.