Tiny386 is a x86 PC emulator written in C99. It now boots Windows 9x/NT on ESP32-S3 dev board JC3248W535. The core of the project is a built-from-scratch, simple and stupid i386 cpu emulator. Some features are missing, e.g. debugging, hardware tasking and some permission checks, but it should be able to run most 16/32 bit softwares. To boot modern linux kernel and windows, some 486 and 586 instrutions are added. The cpu emulator is kept in ~6K LOC. There is also an optional x87 fpu emulator. To assemble a complete PC system, we have ported many peripherals from TinyEMU and QEMU, it now includes: - 8259 PIC - 8254 PIT - 8042 Keyboard Controller - CMOS RTC - ISA VGA with Bochs VBE - IDE Disk Controller - NE2000 ISA Network Card - 8257 ISA DMA - PC Speaker - Adlib OPL2 - SoundBlaster 16