Original MTE 201 test cartridge for Intellivision consoles from the 1980s, recovered from a warehouse stock by the Blue Sky Rangers, the group of Intellivision game programmers who worked for Mattel Electronics in the early 1980s, and labeled in December 2019. These kind of cartridges were for testing Intellivision consoles. This one was found, unlabelled, and the label was created by the Blue Sky Rangers to identify it. Cartridge is vintage and the label is new.

Mattel's test cartridges were used by Mattel to diagnose malfunctioning Intellivision consoles. There are 7 known Mattel test cartridges and they vary by 2 aspects:

•  Version of the test code
•  Whether a game plays at the end

Version   Displayed   Successful
Name      Version     Ending                      Original Label
-------   ---------   ----------                  --------------
v1.0      <none>      no game, "PASS-PASS-PASS"   VIDEO TEST CARTRIDGE
v1.0a     V1A         no game, "PASS-PASS-PASS"   ?
v3        V3          Baseball                    MTE 201 TEST CARTRIDGE
v3b       V3          Night Stalker               ?
v3.3      V3.3        blank green screen          ?
v4.1a     V4.1        blank green screen          ?
v4.1b     V4.1        Night Stalker               ?

FEATURES:
"Loose" Cartridge only