PASS: GNU Chess6.3.0.12 EN /6.3.0.13 DE in verified8086 instruction-compatibility emulation.
EN 2676a6fb7f2539399a184718cc8aa15b29ab146fe6d5efe281e439ffe31acb70
DE 4e18a9d01870d7e9b78acf568b5a1b346de19a074dc10c94e0c75ce0b4a10b9e

Official DOSBox-X2024.03.01SDL2, core=normal,cputype=8086,640KiB conventional BIOS memory, XMS/EMS/UMB disabled, disk.geo swapping only. Same probe under386 is a negative control; PUSHSP and CL32 distinguish both models.
Both editions normal manager launch, mouse and depth4keyboard replyg8f6, Engine/Computerzug, Undo/New, maximize and lifecycle/nativeExitDOS pass. EN manual resize tocell24 works. Maxcell43 Undo incremental/full expose RGB difference0.
No physical hardware/bus timing claim. Kernel CPUbyte and heap were not directly observed from stripped binary. No new minimum-RAM guarantee.
