The board breaks out all of the pins; exactly what would be expected. The only issue that I had was that the JTAG port is close enough to the processor that it had some slight mechanical interference with the JTAG adapter. I took some sandpaper to the JTAG adapter's connector and now there is no interference.
I got both the ATtiny 84 and the ATtiny85 development boards. Both work well. They were easy to assemble. However, if your eyes are on the older side, then you may want to get the assembled version (if available). By their nature, you are soldering some small components.
After identifying the pins on the SPI connector and connecting a ISP device (USBASP or Arduino as ISP), one can easily burn a "boot" loader or application sketch. I found with the raw devices that one has to "burn" a boot loader to ensure the Arduino ISP timing functions work properly. The Arduino IDE "burns" a generic boot loader to the raw ATtiny84 (or 85). The Arduino IDE generic boot loader does not support programming by a serial or USB connection. But, it does work. With the generic boot loader, one needs to use a SPI connection. The raw devices have this SPI functionality built in.
The documentation does cover assembling the board. It needs to have diagram showing the SPI pin locations. This is not a major problem, if one has Volt Ohm meter to to determine the pins.
I am happy that I got these boards. They work well and come quickly in the mail
Stated accuracy in terms of percent and in terms of frequency deviation don't jibe.
Spec states accuracy of "0.005% or 0.03 Hz" but 0.005 percent of 60 Hz =0.003 Hz, and 0.03 Hz would mean an accuracy of 0.05%. Which is it? And from what are you stating this accuracy? Is it from the spec of a quartz crystal you are using?
Howard, thanks for pointing out my goof. The correct spec is 0.005% (0.003Hz at 60Hz).
I've updated the project description and documentation wiki to fix the goof and add detail on the accuracy spec.
After measuring every strobe I've produced so far with a Saleae Logic analyzer, all have measured within 0.005%.
The crystal specs at +-30ppm at 25C or +-0.003% which is 0.006% total. I confess I misread the spec as 30ppm absolute and so I have updated the description to use the cyrstal specs rather than my measurements.
Thanks again, Michael