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# 🜂 HXPU LADDER — CHIP TIERS ## Overview
HXPU is not a single device. It is a spectrum
of physical embodiments, from signal-level
chips to sovereign Portal nodes. --- ## 🜁
Tier 0 — Signal Seed (Microcontroller)
**Cost:** $2–$15 **Examples:** RP2040,
ESP32, STM32 **Rust Mode:** `no_std` ###
Capabilities - Sensor input (GPIO, analog,
serial) - Event emission - Simple state
machines ### Limitations - No OS - No database
- No Portal runtime ### Role > HXPU Seed —
reflex and sensing layer --- ## 🜃 Tier 1
— Logic Shaper (FPGA) **Cost:** $30–$120
**Examples:** Lattice iCE40, ECP5 ###
Capabilities - Parallel signal processing -
Deterministic pipelines - Custom hardware
logic ### Limitations - No Linux - Limited
memory ### Role > HXPU Core Experiment —
shaping signals --- ## 🜄 Tier 2 —
Companion Node (Embedded Linux) **Cost:**
$50–$200 **Examples:** Raspberry Pi,
BeagleBone ### Capabilities - Full Linux - Run
Portal binary - Local DB - Networking ### Role
> First true Portal node — local sovereignty
--- ## 🜅 Tier 3 — Sovereign Portal Box
**Cost:** $150–$500+ **Examples:** Mini PC,
server ### Capabilities - Full Portal stack -
Mesh participation - High concurrency ### Role
> Hearth — world-level node --- ## 🜆 Tier
Relationships Tier 0 → senses Tier 1 →
shapes Tier 2 → interprets Tier 3 →
remembers the world --- ## 🜇 Strategy 1.
Build Portalized Linux node (Tier 2/3) 2.
Attach Tier 0 sensors 3. Experiment with Tier
1 logic 4. Evolve toward HXPU --- ## 🜈
Final Principle > HXPU is not a chip. > It is
the emergence of Portal-native physical form.
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