Commodore 64 Multi Test cartridge Diagnostic / DEAD TEST/DesTestMAX/1541 Diag...
More info here: here. DesTestMAX v0.1. 1541 DIAGNOSTIC WORLD OF JANI. Test 4 is for testing your 1541 drive. C-64 DIAGNOSTIC 324528-02 REV 324518. C-64 DEAD TEST STIO 1.2.0. C-64 DEAD TEST 781220.