SA-1 Hello World

SA-1 boot diagnostic – verifies coprocessor initialization

Build & Run

cd $OPENSNES_HOME
make -C examples/chips/sa1_hello

Then open sa1_hello.sfc in luna (or any SNES emulator).

What You'll Learn

• SA-1 coprocessor cartridge type detection
• I-RAM shared memory between SNES CPU and SA-1
• SA-1 boot status codes and diagnostics
• Using USE_SA1 := 1 in the Makefile

Status Codes

Value	Meaning
$A5	SA-1 booted successfully
$FF	I-RAM access failure
$00	SA-1 timeout (never responded)
$42	I-RAM not cleared (self-test stuck)

Modules Used

Module	Purpose
console	System initialization
sprite	OAM management
dma	DMA transfers
background	BG configuration
text	Diagnostic text display
input	Joypad reading
sa1	SA-1 coprocessor driver