Jet Black Special Pre-Alpha Test 01

Jet Black Special Pre-Alpha Test 01 is an OS released my Microsoft Corporation in late 1977. Its slogan was "One step closer to the future: Jet Black Pre-Alpha." "One step closer to the future" refers to the new OS scheduled for release in 1985 called Windows.

Chronology
Proceeded By: Codename Jetblack

Succeeded By: Jet Black Special Pre-Alpha Test 02