no$psx
problemkaputt.de
What it is
no$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.
Spec sheet
- Product
- no$psx is a PlayStation 1/PSone emulator and debugger.Read 4 Oct 2026 · problemkaputt.de
- Audience
- The maker says homebrew programmers have found the debugging functions useful.Read 4 Oct 2026 · problemkaputt.de
- Integrations
- The v2.3 release notes say i-mode HTTP messages can be redirected to the real internet.Read 4 Oct 2026 · problemkaputt.de
- Support
- The maker invites bug reports and lists email and no$psx forums as contact options.Read 4 Oct 2026 · problemkaputt.de
- Maker
- The product page attributes no$psx to Martin Korth; the maker’s donation page identifies Hamburg, Germany in its banking information.Read 4 Oct 2026 · problemkaputt.de
- BIOS
- The emulator uses a free, faster BIOS clone that may have compatibility issues; the maker suggests placing an original BIOS copy named PSX-BIOS.ROM in the no$psx folder if needed.Read 4 Oct 2026 · problemkaputt.de
- 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.Read 4 Oct 2026 · problemkaputt.de
- 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.Read 4 Oct 2026 · problemkaputt.de
- 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.Read 4 Oct 2026 · problemkaputt.de
- 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.Read 4 Oct 2026 · problemkaputt.de
- 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.Read 4 Oct 2026 · problemkaputt.de
- Latest listed release
- The download page lists no$psx v2.3, a Windows 32-bit version dated 05 Jun 2026, and a cut-down gaming version.Read 4 Oct 2026 · problemkaputt.de
- Performance requirement
- The stated minimum requirement is around a 1–2 GHz Pentium 3.Read 4 Oct 2026 · problemkaputt.de
- Real CD drives
- Reading from real CD-ROM drives is supported and requires wnaspi32.dll; the maker notes this appears problematic on Windows NT/2000 and later.Read 4 Oct 2026 · problemkaputt.de
- Security and compliance
- The opened product and maker pages do not state security certifications or compliance claims.Read 4 Oct 2026 · problemkaputt.de
Plans and prices
no$psx Free Freeware; Windows 32-bit download; gaming version is cut down Read 4 Oct 2026 · problemkaputt.de
Strong points and limits
Strong points
- Freeware with 0.00 USD plan price
- Supports multiple disc-image formats
- Includes extensive debugging and viewing tools
- No BIOS required by default
- Windows 32-bit v2.3 release listed
Limits
- Compatibility problems may occur
- Real CD drives need wnaspi32.dll
- Later Windows versions may have drive issues
- Gaming version is cut down
Who it suits
It suits Windows users running PS1 software and homebrew programmers who need PlayStation debugging tools.
Verdict
no$psx combines PlayStation emulation with unusually detailed development and debugging tools at no cost. Its untested game compatibility and real-drive limitations should be considered before relying on it for particular software.
Where Specifiction places it
- PlayStation Emulators#10 of 257.7