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akadata edited this page Feb 14, 2026 · 2 revisions

Amiga Platform

PiStorm64 on Amiga focuses on the 68k bus engine, FC/BERR plumbing, and Z2/Z3 memory/RTG features. The emulator runs on the Pi and exposes devices to the Amiga via the CPLD and Zorro bus.

Kernel module (pistorm.ko)

Stable Pi4 setup (current default clocking, ~200 MHz GPCLK0 from PLLC):

sudo modprobe pistorm gpclk_src=5 gpclk_div=6 berr_reset_input=1 run_batch_enable=1

Emulator launch

Non-JIT (Musashi, default)

Enable the batching queue:

PISTORM_ENABLE_QUEUE=1 ./emulator

Optional batch hint (default 2048):

PISTORM_ENABLE_QUEUE=1 PISTORM_BATCH_BITS=2048 ./emulator

Batch hints are capped at 2560 for stability; higher values may regress performance.

UAE JIT (experimental)

Build and run the UAE JIT backend:

make USE_UAE_JIT=1 uae-jit
PISTORM_ENABLE_QUEUE=0 ./emulator --jit

Keep the initial JIT bring-up config minimal (ROM + chip RAM + platform) and add devices incrementally. See UAE-JIT-Status for the current state and known limitations.

Notes

  • FC is treated as a full 3‑bit value end‑to‑end (0–7).
  • BERR is multiplexed onto GPIO5 when berr_reset_input=1.
  • Pi4 stability is currently best at GPCLK div=6 (~200 MHz).
  • Current testing coverage: Pi4 8 GB and Pi Zero 2 W.
  • UAE JIT backend is experimental; see UAE-JIT-Status for current bring-up state and known limitations.

Only the Amiga Makes it Possible.

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