Just got off the phone with a helpful HP support tech.
He pointed out that displaying the clock would contribute to missed keystrokes,
after fiddling with the machine further, it appears that I never miss keystrokes (pressing four '4's very rapidly generates '4444' on the stack) if the stack is clean.
Once the stack gets 3 levels deep, I begin getting 44 instead of the inteded 444, and so forth. So could 'overclocking' the machine resolve this (as VPN suggested earlier)?
If you read this, VPN, could you please help me understand how to accomplish 'overclocking' it? Also, will it cause damage over time to the hardware?
I can't imagine clearing the stack every few calculations..
Eric