Boots the HP-12C to its RPN display showing 0.00, ready for entry. Type on the on-screen HP-12C keyboard, or use your physical keyboard for the digits, . , + − × ÷, ENTER, ← (CLx / back) and ESC (= ON). The f (gold) and g (blue) prefix keys reach the financial functions printed above and below each key. Open the debugger to single-step the HP Nut processor, read and write its A/B/C/M/N field registers and nibble RAM, set breakpoints and RAM write-watchpoints. The HP-12C system ROM (NUT microcode) is copyright Hewlett-Packard; the redistributable dump is self-hosted for emulation.