SlimeNENC — Legacy Modernization Transpiler Family
Deterministic, audit-grade, bit-exact modernization from legacy to modern languages.
SlimeNENC is an umbrella brand for nine products. They modernize 30+ year-old legacy assets in finance, pension, healthcare, and public-sector systems with bit-exact correctness and audit chains.
Same-language parallelization on the migrated target is offered as a peer independent product, PSDP (not a SlimeNENC subset).
Try the service (cross-language conversion) → Request Materials / Contact
All 8 SlimeNENC backend wasm modules (S1-S8) re-implemented in Rust 1.93 + wasm32-wasip1 (no unsafe, panic=abort, strip=symbols, with wasm-opt -Oz post-processing).
Total 637 KB — 29% of the C build's 2.16 MB.
NIST 459 + Portfolio 42 + 14 expansion clones 915 + ACAS 3.01.07 (UK commercial since 1976, GPL) 268 + US federal CMS Medicare Pricer 7 systems 114 + baseline 20 = 1,818 unique COBOL files × 8 stages = 14,544 comparisons passed sha256 byte-exact 100.000% (zero regressions, complete C-version interoperability preserved). Rust bounds checking + monomorphization + symbol stripping additionally raises reverse-engineering resistance — and the move returns the codebase to its original Lisp → Rust lineage.
2026-05-19 update — 10-corpus external WASI benchmark: 3,910 / 3,910 byte-exact = 100.000%
The flagship SlimeCOBOL (Subset A) was put through a 127.0.0.1-only WASI service (wasmtime 40.0.0) against 782 files across 10 external COBOL corpora, and the HTTP response was confirmed SHA-256 byte-exact with the direct ELF emit result for every one of the 782 × 5 languages = 3,910 tests (2026-05-19). Corpora: NIST CCVS85 (FIPS 21-3) 459 + AWS CardDemo 44 + IBM CBSA 29 + Rocket BankDemo 81 + sentientsergio 42 + defects-suite 53 + DOGECICS (EXEC CICS / pseudo-conv / commarea / VSAM) 5 + writ3it / neopragma / michelou 69 = 782 files total. The April-23 dialect-verify 18/18 × 5 languages = 90/90 bit-exact cells are also preserved (regression 0). See the metrics table on the SlimeCOBOL page →
Ten-product portfolio
All ten share the same Slot IR + language-independent S2-S5 / S7-S9 pipeline; only S1 (front-end) and S6 (emitter) change to extend coverage.
SlimeCOBOL
SlimeJCL 2026-Q3
SlimeMUMPS
SlimePL/I
SlimeRPG
SlimeFORTRAN
SlimeNatural
SlimeASM
SlimeASM-rev
Common safety mechanisms (across all products)
| Bit-exact | Output matches input behavior down to the bit; same input → same sha256. |
|---|---|
| Round-trip | Convert + reverse-convert produces token-identical source. Formal proof of zero information loss. |
| Audit chain | SHA-256 monotonic chain over every conversion step. Detects single-byte tamper. |
| Rollback | Tombstone-based; chain is append-only, full prior state recoverable. |
| Determinism | Stable across parallel and GPU execution (Hilbert ordering + indexed lookups). |
| Hallucination | Trigram + bigram detect 95% of mistranslations; silent-pass under 1.1%. |
| Build-time LLM | LLM is used only at rule-construction time; runtime is deterministic rules — basis of the 100.000% claim. |
Land-and-expand path
- Phase 1: Migration tool — SlimeCOBOL / SlimeMUMPS prove "bit-exact convertible" with audit chain
- Phase 2: Same engine for batch JCL — Add SlimeJCL, single-tool project completion
- Phase 3: Parallelize on the modern target — independent product PSDP makes existing Java/Rust batches parallel, output unchanged. SlimeNENC customers get the PSDP tool bundled; see the PSDP price table for the four introduction paths.
Each product is an independent SKU; no bundling.
License model
| Pricing | US$ 9.95 per LOC (per source line converted; one-time) |
|---|---|
| Source policy | Source-free — generated source code is the customer's asset, perpetual deploy, no royalty |
| Method | Ed25519-signed license + 3-hop air-gap activation (for finance) |
| Editions | Trial / Individual / Corporate / OEM |
| License server | license.javatel.jp (AWS Lightsail, HSTS / OCSP stapling) |
Related products
PSDP — Same-Language Parallelization
Inject deterministic parallelization into Java assets migrated by SlimeNENC, bit-exact, runtime-billed.
Sold separately, with a bundled rate for SlimeNENC customers — see the PSDP price table. PSDP is a peer independent product, not a SlimeNENC sub-product.
Resources
Try the service (cross-language conversion) → Contact / Materials SlimeCOBOL SlimeMUMPS SlimePL/I SlimeRPG SlimeFORTRAN SlimeNatural SlimeJCL SlimeASM SlimeASM-rev PSDP (independent)