Yep, Y1 is 4 MHz -- you can go higher based on the CPU included with your kit, some of them can run with a 10 MHz crystal. The USART clock is separate (that's what Y2 is for) so upping CPU speed won't mess up baud rates. Thanks, Jonathan On Sun, May 27, 2018 at 5:57 PM, Ethan O'Toole via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:

Just verifying, everything is soldered except the xtal. I'm guessing y1 is the 4mhz?

- E