CHIP-8

CHIP-8 is an interpreted programming language developed in the mid-1970s by Joseph Weisbecker for the COSMAC VIP and Telmac 1800 microcomputers. It was designed to make game programming easier. Programs are run on a virtual machine with a 64×32 pixel monochrome display, 16 input keys, and a simple sound timer.

SuperChip (S-CHIP) extends CHIP-8 with a 128×64 high-resolution mode, 16×16 sprites, scrolling, persistent flag registers, and a larger font. Select "SuperChip (Legacy)" for original HP-48 behavior or "SuperChip (Modern)" for updated quirks.

S-CHIP Flag Registers (RPL User Flags): These are 8 persistent 8-bit registers (R0-R7) separate from the V-registers. On the original HP-48 calculator hardware, these survived power cycles. In this emulator, they are saved to localStorage so they persist across sessions — just like the real hardware. The opcodes FX75 (store) and FX85 (load) access these registers.

Keyboard mapping: 1234 / QWER / ASDF / ZXCV → CHIP-8 keys 123C / 456D / 789E / A0BF

Quirks by mode:

• CHIP-8: VF reset ✓, Memory increment ✓, Display wait ✓, Shift from VY, Jump V0+NNN
• S-CHIP Legacy: No VF reset, No memory increment, Display wait ✓, Shift from VX, Jump VX+XNN
• S-CHIP Modern: No VF reset, No memory increment, No display wait, Shift from VX, Jump VX+XNN