U1
NEC VR4300
CPU
Main CPU
About this component
The VR4300 runs game code and does geometry set-up work alongside the RCP, connecting to it over a 32-bit external bus. It has 16 KB instruction and 8 KB data cache and an on-chip FPU. The N64 version differs from the catalogue VR4300 in the position of six pins, so a stock part is not a drop-in replacement. CPUs in early consoles can have a floating-point multiply bug that later steppings fixed.
What it does on this board
MIPS R4300i-based 64-bit CPU @93.75MHz.
Pinout & readings
No pinout or reference readings yet — these show what each pin does and what a healthy part should measure.