A computer with provable immunity against hacking
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Dauug|36 is an open-source minicomputer for critical infrastructure, where the end user has the final say in all design and manufacturing aspects of the hardware.

Unlike contemporary computers that contain non-inspectable, proprietary semiconductor complex logic such as microprocessors, FPGAs, PLDs, and ASICs, the Dauug|36 architecture is built using surface-mount technology using only simple, generic components with dependable characteristics. Inside its security perimeter, a Dauug|36 contains only these logic elements:

*   buffer
    inverter
    AND
    OR
    NAND
    NOR
    XOR
    D flip-flop
    SRAM

It is this last component, synchronous static RAM or SRAM, that makes Dauug|36 a competitive machine for many of today's applications. The architecture is entirely open-source, and physical inspection of an assembled system requires only millimeter-scale visual observation and continuity testing. Only maker-scale assembly tools are necessary, allowing the builder to use hot air hand soldering with tweezers, a reflow oven with a small pick-and-place machine, or any combination. Neither a semiconductor foundry nor purchased VLSI complex logic are involved in sourcing the minicomputer.

Dauug|36 security benefits
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Dauug|36 was designed from scratch to exclude exploitable hardware defects, whether they originate in longstanding custom (e.g. arithmetic wraparound), undue complexity (e.g. RowHammer, Spectre, Meltdown), or intentional backdoors (e.g. Clipper). There is no dependence on foreign countries---regardless of where you are---or semiconductor companies for trustworthiness, because the system owner's own soldering and firmware determines the logical connectivity and operation of the computer. There isn't a microprocessor or anything like one anywhere in the design.

Compare the following Dauug|36 characteristics to any other computer architecture on the planet, and decide for yourself.


*   Sticky, consistent overrange flag for arithmetic
    Stratified opcodes for heterogeneous register signedness
    No privilege escalation via stack
    No access to stack except via `CALL` and `RETURN` variants
    Code and stack memory inaccessible via `LD` and `STO` opcodes
    No branch to addresses not hardcoded in `CALL` or `JUMP`
    Faultless paged virtual memory without overcommit
    No privilege escalation via CPU
    No DRAM or DRAM-associated vulnerabilities
    No VLSI complex logic except in attached peripherals
    Every peripheral isolated to its own bus and buffer memory
    No CPU persistent state except for one firmware IC
    No MEMS oscillator for age- and frequency-selected attacks
    No firmware modification without physical access
    No parts that can’t be hand-soldered and probed afterward
    No secret functionality
    No unexplainable S-box constants
    No vendor lock-in
    No encrypted or closed-source firmware
    No license fees to build, use, or modify
    No purpose-of-use limitations
    No planned obsolescence
    No right-to-repair infringements

Dauug|36 specifications
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T   1 /table want-loose-left /mark

t   -------------------- - ---------------------------
    System classification  solder-defined minicomputer
    Logic family           SRAM with 74AUC
    Memory protection      paged virtual memory
    Multitasking           cooperative or preemptive
    Word size              36 bits
    CPU speed              10 MIPS
    Number of opcodes      190 and counting
    Maximum code RAM       4Mi × 36 bits
    Maximum data RAM       8Mi × 36 bits
    Registers per program  512
    Programs ready to run  256
    I/O buses              planned: SPI and I****2****C
    Hardware license       CC BY 4.0 Intl.
    Firmware license       CC BY 4.0 Intl.
    Operating system       Osmin or owner-supplied
    Design lifespan        30 years
    Manufacturer           anyone

Dauug|36 limitations
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Because Dauug|36 is built at human-visible scale, the speed of light and capability of the underlying components produce a different kind of computer than any other on the planet. Compared to recent single-board computers, a Dauug|36 minicomputer is larger (about 25 x 25 cm), more costly ($1,000--$2,000), slower (about 16 million instructions per second, or MIPS), offers less primary storage (4 Mi x 36 bits code + 8 Mi x 36 bits data), and requires more power (10 watts estimated). Moreover, Dauug|36 breaks compatibility with every prior computer on the planet so that its design can be correct. But for applications where these drawbacks are acceptable (and there are more than most people realize), provable immunity to hacking makes this architecture very attractive.