HopStation vs no$psx

HopStation is a work-in-progress PlayStation emulator written in C++, shared chiefly as a reference for emulator developers rather than as a primary way to play games. It emulates the R3000 CPU, GPU, DMA and interrupt controllers, CDROM, GTE, SPU, MDEC, and memory cards. The project provides a windowed application and a headless command-line mode, with tools including a disassembler, executable sideloading, USB controller input, configurable logging, a VRAM viewer, and ImGui introspection windows. It accepts BIN/CUE disc images, but support is buggy: CUE parsing prevents many games from loading, and inaccurate CDROM emulation also limits compatibility. The SPU lacks features such as volume sweep and dynamic ADSR. A PlayStation BIOS is required; only SCPH1001, the original US launch version, has been tested. HopStation builds for Windows, Linux, and macOS and is free under the MIT License. Some builds need additional shader libraries. The author describes it as an unfinished personal learning project and says feature contributions are unlikely to be accepted.

no$psx is freeware for Windows that emulates and debugs PlayStation 1 and PSone software. It is intended to run without special video drivers, plug-ins, virtual CD-ROM drives, a system BIOS, or per-game configuration. Supported disc images include CCD+IMG, CDI, CUE+BIN, MDS+MDF, CHD, NRG, and ISO, alongside raw EXE files and ECM/CDZ decompression. Real CD-ROM drives require wnaspi32.dll, with the maker noting problems on Windows NT/2000 and later. Development tools include a disassembler, debugger, profiler, code and memory breakpoints, assembler, I/O map viewer, VRAM viewer, polygon viewer, TTY console, and PSX hardware specifications. The free BIOS clone may have compatibility issues; an original PSX-BIOS.ROM can be placed in the program folder. The maker says many games have not been tested and compatibility problems may occur. The listed v2.3 Windows 32-bit release adds pixel-accurate GPU rendering, texture/CLUT cache emulation, and timing reproduction. The plan price is free.