calc.bin flashes calc_ir.bin calc_xtal.bin doesn't?

[BarryMead]

(01-30-2015 07:56 PM)Bruce Larrabee Wrote:  Oh - I should mention that yes I have the crystal installed.

Has this calculator EVER been flashed with a version of firmware that confirms that the crystal is installed correctly? Perhaps there is a cold solder joint on the crystal, or one of the two 18pf capacitors that go with it. To confirm that the crystal works, you could flash calc.bin then use the keyboard option (ON)+(C)+(C) to turn on the crystal and see if it locks up (See page 208 of your 244 page manual).