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

[BarryMead]

(01-30-2015 10:38 AM)Bruce Larrabee Wrote:  Hi - I have no trouble flashing with calc.bin but can not get calc_ir.bin or calc_xtal.bin to flash. Anyone have any idea what I might be doing wrong?

Do you have the 32768 Hz Crystal and two 18 pf caps installed in the calculator you are attempting to flash? For these flash images to work the crystal must be installed. As shipped from the factory the HP-30B does not include this crystal. The firmware uses this crystal to implement the Stopwatch and Time keeping functions. So if you try to flash either calc_xtal.bin calc_xtal_full.bin, calc_ir.bin, or calc_ir_full.bin
the firmware will LOCK-UP (Appear to be dead) unless the crystal is installed.