Seems overclocking the ATMEGA8515 works but some chips have strange side effects. I've decided to drop any remaining kits down to 16mhz for now and work on a replacement CPU adapter board.
If you kit suffers from not loading BASIC and running correctly, or other issues email me and I'll see if it fits in the description of the issues I've run into. If it does, you can send in the CPU for reprogramming and I'll send with it a 16mhz crystal to swap out on the board.
If you system works fine, I'd leave it go, this only will apply to people who can't get their board to function correctly. Email me at vince@brielcomputers.com and I can help work out issues.
Next month I'll work out a daughter board with a new CPU (If it is compatible) and it is native 20mhz so it can handle it with 0 issues! Sorry guys, sometimes these things don't pop up until a few units roll out. The only advantage to the new CPU upgrade board will be the stable 20mhz speed, so if your Altair micro is working good, then your CPU is stable at the 20mhz speed and you won't need the board.
Feel free to ask me any questions about this.
Vince