Graphics are severely distorted
denjhang opened this issue · 4 comments
I've successfully made a Minimal terminal, but I'm finding that the vga output is sporadic and distorted. And it seems that the PS2 keyboard is typing certain characters automatically.
whats the clock speed u're using?
I use a 24.000mhz passive crystal. I checked other issues on github that inspired me. So I used a 24mhz active crystal oscillator and everything was fine.
yep... new atmega328s cannot drive 24mhz... I've tested 24, 20 16 mhz passive crystals but only 16mhz works.
So... only active crystals can be now used to overclock the atmega328.
The ATMega328s I had used for development and testing were indeed a couple of years old. I've never had any problems with overclocking them up to 24MHz passively. Anyway, thanks for digging into this, guys. This can be a valuable information for anyone rebuilding this little terminal.
Cheers, slu4