Part of the TempleOS-web family: TempleOS-web (the site, assembles this repo at build time) · holyc-wasm (clone as a SIBLING ../holyc-wasm — build.mjs, the JIT and every harness import it from there) · TerryADavis-archive-transcriber.

Harnesses expect /tmp/live.bin (gunzipped live.bin.gz) and /tmp/templeos.raw (the site's vendor/images/templeos-hd.qcow2.gz, flattened).

A clean-room, debloated, TempleOS-only x86-64 emulator, written almost entirely in HolyC and compiled to WebAssembly by holyc-wasm (sibling checkout: ../holyc-wasm). It replaces qemu-wasm.

Where QEMU is a generic, multi-architecture, every-device hypervisor (~6,900 C/H files, ~24 CPU targets), hemu emulates exactly one machine: the PC that TempleOS V5.03 runs on — x86-64 + VGA + ATA + PS/2 + PIC/PIT/RTC — and nothing else.

• x86-64 only, TempleOS's graphics format only, everything else deleted.
• < 100,000 lines total.
• >= 91% of the code is HolyC. Only the irreducible host boundary (canvas, keyboard/mouse, disk image, and—if/when we JIT—WebAssembly instantiation) is JS.
• Native where possible: the core runs as real compiled WASM (holyc-wasm), and TempleOS's own hot routines are recognized and run natively (HLE) instead of being emulated instruction-by-instruction.

• src/ — the emulator, in HolyC (CPU, memory, decode/execute, devices)
• host/ — the thin JS shim (display/input/disk/loop), on holyc-wasm's runtime
• tools/ — build + measurement scripts
• examples/ — hand-assembled x86-64 test programs for the core

1. Debloat qemu-wasm -> bare bones (see DEBLOAT.md).
2. x86-64 CPU in HolyC -- full integer ISA + SSE2/F64 + x87 FPU + string/bit/LOOP ops + CMPXCHG/XADD, validated vs real clang code, 31/31 tests.
3. Memory model sized for TempleOS (384 MiB MAlloc'd), identity-mapped, flat segments.
4. Devices: PIC (8259x2), PIT (IRQ0 scheduler tick), CMOS RTC (advancing clock), LAPIC/HPET MMIO, PS/2 keyboard (IRQ1) + mouse (IRQ12); VGA presented by HLE (read gr.dc2->body) instead of planar emulation.
5. System/long-mode: control regs, MSRs (FS/GS base), IDT/GDT, INT/IRETQ, CPUID, RDTSC/RDMSR/WRMSR, HLT-idle + IRQ wake.
6. Boot real TempleOS V5.03 from a VM-paused qemu snapshot (tools/bootdump6.py -> tools/bake-regs.mjs -> src/snapregs.HC). hemu runs it continuously and stably -- 64M+ instructions, ~3200 timer IRQs, jiffies/RTC advancing, no faults -- renders the desktop, and the real GrUpdateScrn composite pipeline runs (HLE-called).
7. Input path: injected PS/2 keyboard/mouse events deliver IRQs whose handlers wake the focus task (verified: a keypress triggers ~35k-390k guest instrs of processing).

• The snapshot captures the content tasks (clock, shell, WinMgr) blocked in TempleOS IPC message-waits, so they don't redraw -> the on-screen content is static even though the system is fully live (timer/scheduler/input all run). Waking them needs either a cleaner capture point or delivering the IPC messages they await.
• Sound (PC speaker via PIT ch.2 / port 0x61) is not yet wired; it only fires from a running task, which hits the same blocked-task limitation.
• Optional HolyC JIT (reuse holyc-wasm's WASM emitter as the backend) -- future.

• node tools/measure.mjs -- the 31-check CPU battery.
• node --max-old-space-size=3072 tools/snap-run.mjs -- boot the TempleOS snapshot headless; writes the rendered desktop to /tmp/hemusnap/screen.ppm.