no$psx
no$psx is a free Windows emulator and debugger for PlayStation 1 and PSone software.
What no$psx is
no$psx is a free Windows emulator and debugger for PlayStation 1 and PSone software. It is designed 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; it also accepts raw EXE files and ECM/CDZ decompression. Real CD-ROM drives are supported with wnaspi32.dll, though the maker notes problems on Windows NT/2000 and later. Development tools include a disassembler, debugger, profiler, code and memory breakpoints, assembler, I/O map and VRAM viewers, polygon viewer, TTY debug console, and PSX hardware specifications. The emulator uses a free BIOS clone that may create compatibility issues; an original BIOS copy can be placed in the program folder if needed. The maker says it has not been tested with many games, so compatibility problems may occur. The listed v2.3 Windows 32-bit release includes pixel-accurate GPU rendering and related graphics updates; a cut-down gaming version is also listed.
Good
- Freeware for Windows.
- Supports numerous disc-image formats.
- Includes debugger, profiler, and breakpoints.
- Designed to work without a system BIOS.
- Listed v2.3 release includes GPU rendering updates.
Watch out
- Compatibility problems may occur with games.
- BIOS clone may cause compatibility issues.
- Real-drive support has noted issues on newer Windows versions.
- Gaming version is cut down.
Who it suits
It suits Windows users who want PlayStation emulation alongside debugging and development tools. Homebrew programmers may find its debugging functions useful, though game compatibility is not assured.
Verdict
no$psx combines PlayStation emulation with a broad set of development and debugging tools. Its maker warns that compatibility may vary, and real-drive use has a stated Windows caveat.
Plans and prices
From no$psx's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| no$psx | Free | Freeware; Windows 32-bit download; gaming version is cut down |
The facts
Each one read from no$psx's own pages, with the date it was checked.
What it does
- Audience
- The maker says homebrew programmers have found the debugging functions useful.checked 4 Oct 2026
- Development tools
- Debugging and development functions include a disassembler, debugger, profiler, code and memory breakpoints, assembler, I/O map viewer, VRAM viewer, polygon viewer, TTY debug console, and PSX hardware specifications.checked 4 Oct 2026
- Disc and executable formats
- It supports CD-ROM images in CCD+IMG, CDI, CUE+BIN, MDS+MDF, CHD, NRG, and ISO formats, plus raw EXE files and ECM/CDZ decompression.checked 4 Oct 2026
- Emulation
- The maker says the emulation is intended to implement all hardware features, but notes it has not been tested with many games and may have compatibility problems.checked 4 Oct 2026
- Graphics update
- The v2.3 release notes list pixel-accurate GPU rendering, texture/CLUT cache emulation, and reproduction of average pixel and polygon rendering timings.checked 4 Oct 2026
- Integrations
- The v2.3 release notes say i-mode HTTP messages can be redirected to the real internet.checked 4 Oct 2026
- Intended use
- The program is intended to work out of the box without special video drivers, plug-ins, virtual CD-ROM drives, a system BIOS, or per-game configurations.checked 4 Oct 2026
- Latest listed release
- The download page lists no$psx v2.3, a Windows 32-bit version dated 05 Jun 2026, and a cut-down gaming version.checked 4 Oct 2026
- Performance requirement
- The stated minimum requirement is around a 1–2 GHz Pentium 3.checked 4 Oct 2026
- Product
- no$psx is a PlayStation 1/PSone emulator and debugger.checked 4 Oct 2026
- Real CD drives
- Reading from real CD-ROM drives is supported and requires wnaspi32.dll; the maker notes this appears problematic on Windows NT/2000 and later.checked 4 Oct 2026
- Security and compliance
- The opened product and maker pages do not state security certifications or compliance claims.checked 4 Oct 2026
- Support
- The maker invites bug reports and lists email and no$psx forums as contact options.checked 4 Oct 2026
Where it runs
- BIOS
- The emulator uses a free, faster BIOS clone that may have compatibility issues; the maker suggests placing an original BIOS copy named PSX-BIOS.ROM in the no$psx folder if needed.checked 4 Oct 2026
The company
- Maker
- The product page attributes no$psx to Martin Korth; the maker’s donation page identifies Hamburg, Germany in its banking information.checked 4 Oct 2026