Apple Rhapsody Developer Release 1

Apple Rhapsody Developer Release 1 is the first Developer Preview of the Apple Rhapsody operating system, released to developers in September 1997. This build is the first available Mac OS build to be based on the NeXTSTEP codebase following Apple's acquisition of NeXT to create a transitional operating system between the classic Mac OS system and a then-upcoming new generation of Mac OS operating systems that would later be known as Mac OS X.

System requirements
According to the installation documentary, Rhapsody requires the following: To use this version of Rhapsody, your computer must have:
 * A 486, Pentium, or Pentium Pro microprocessor
 * ISA, EISA, VL-Bus, or PCI expansion bus
 * A 750 MB or larger hard disk
 * At least 32 MB of RAM (48 MB is recommended)
 * A supported graphics adapter (video display card)
 * A supported IDE or SCSI adapter
 * IDE or SCSI CD-ROM drive
 * One 3.5-inch floppy disk drive