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no$psx
What it is
no$psx is a free Windows emulator and debugger for PlayStation 1 and PSone software. It is designed to start without special video drivers, plug-ins, virtual CD-ROM drives, a system BIOS, or per-game configurations. It supports CD-ROM images in CCD+IMG, CDI, CUE+BIN, MDS+MDF, CHD, NRG, and ISO formats, as well as raw EXE files and ECM/CDZ decompression. Real CD-ROM drives are also 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 hardware specifications. The emulator uses a free, faster BIOS clone that may have compatibility issues; an original BIOS copy named PSX-BIOS.ROM can be added to the program folder if needed. The maker says the emulation is intended to implement all hardware features but has not been tested with many games, so compatibility problems may occur. The listed v2.3 Windows 32-bit release is dated 05 Jun 2026 and includes graphics updates. A cut-down gaming version is also listed.
For and against
For
- Supports multiple disc-image formats
- Includes debugger, profiler, and breakpoints
- Runs without a system BIOS by default
- Freeware for Windows
Against
- Compatibility problems may occur with games
- Real CD drive support has noted Windows NT/2000-and-later issues
- Gaming version is cut down
The verdict
no$psx combines PS1/PSone emulation with a broad set of debugging tools and supports several disc-image formats. The maker cautions that game compatibility may vary, and real-drive support has a stated Windows caveat.
Who it suits
no$psx may suit Windows users exploring PS1/PSone software or homebrew programmers who want debugging and development tools. Readers should account for the maker’s compatibility caveat.
Plans and prices
no$psx
Freeware; Windows 32-bit download; gaming version is cut down
Read 4 Oct 2026 · problemkaputt.de
On the record
- Audience
- The maker says homebrew programmers have found the debugging functions useful.problemkaputt.de · read 4 Oct 2026
- BIOS
- The emulator uses a free, faster BIOS clone that may have compatibility issues; the maker suggests placing an original BIOS copy named PSX-BIOS.ROM in the no$psx folder if needed.problemkaputt.de · read 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.problemkaputt.de · read 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.problemkaputt.de · read 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.problemkaputt.de · read 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.problemkaputt.de · read 4 Oct 2026
- Integrations
- The v2.3 release notes say i-mode HTTP messages can be redirected to the real internet.problemkaputt.de · read 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.problemkaputt.de · read 4 Oct 2026
- Latest listed release
- The download page lists no$psx v2.3, a Windows 32-bit version dated 05 Jun 2026, and a cut-down gaming version.problemkaputt.de · read 4 Oct 2026
- Maker
- The product page attributes no$psx to Martin Korth; the maker’s donation page identifies Hamburg, Germany in its banking information.problemkaputt.de · read 4 Oct 2026
- Performance requirement
- The stated minimum requirement is around a 1–2 GHz Pentium 3.problemkaputt.de · read 4 Oct 2026
- Product
- no$psx is a PlayStation 1/PSone emulator and debugger.problemkaputt.de · read 4 Oct 2026
- Real CD drives
- Reading from real CD-ROM drives is supported and requires wnaspi32.dll; the maker notes this appears problematic on Windows NT/2000 and later.problemkaputt.de · read 4 Oct 2026
- Security and compliance
- The opened product and maker pages do not state security certifications or compliance claims.problemkaputt.de · read 4 Oct 2026
- Support
- The maker invites bug reports and lists email and no$psx forums as contact options.problemkaputt.de · read 4 Oct 2026