Jani collected information about diagnostic cartridges. You can find manuals, software and schematics for the C-64 Dead Test Kit, C-64 Diagnostic Assembly Kit, C-64 Diagnostic Rev 4.1.0, C-64 Diagnostic, C-128 Diagnostic, C-128 Diagnostic Assembly Kit, C-128 Diagnostic Rev 1.1 & 1.4 and C-128 DCR Integral Diag 1.0.