Current version :

PCem v17 for Windows
PCem v17 for Linux

Old versions :

PCem v16 for Windows
PCem v16 for Linux
PCem v15 for Windows
PCem v15 for Linux
PCem v14 for Windows
PCem v14 for Linux
PCem v13.1 for Windows
PCem v13.1 for Linux
PCem v13 for Windows
PCem v13 for Linux
PCem v12 for Windows
PCem v12 for Linux
PCem v11 for Windows
PCem v11 for Linux
PCem v10.1 for Windows
PCem v10.1 for Linux
PCem v10 for Windows
PCem v10 for Linux
PCem v9 for Windows
PCem v9 for Linux
PCem v8.1 for Windows
PCem v8 for Windows
PCem v0.7 for Windows
PCem v0.6 for Windows
PCem v0.5 for Windows
PCem v0.41a for Windows
PCem v0.41 for Windows
PCem v0.4 for Windows
PCem v0.3 for Windows
PCem v0.2a for Windows
PCem v0.1 for Windows

Useful downloads :

Generic clone XT BIOS ROMs
There appears to be no copyright on this BIOS at all so I have no issues with distributing it.

XTIDE Universal BIOS
The XTIDE Universal BIOS is licensed under the GPLv2. Source code is at https://code.google.com/archive/p/xtideuniversalbios/. This archive contains the three builds used by PCem - XT, AT, and AT v1.1.5 (used by PS/1 Model 2011).