From Wikipedia:

DayStar Digital, Inc., was founded in 1983 by Andrew Lewis as a
subcontract manufacturer of electronic assemblies and circuit boards.
In 1986, the company released memory upgrades for Apple Macintosh
Computers, its first product. In 1987 the company began to market
processor upgrades exclusively for the Mac, the first one for the
Apple Macintosh II computer. The company focused exclusively on this
market for the full range of Mac computers through 1995, utilizing the
Motorola 68030, 68040 and PowerPC 601 processors. These upgrades
installed in various Macintosh platforms either in the PDS slot
directly, as on the Macintosh IIci, or via an adapter. DayStar became
known as the leading "speed shop" for Macintosh computer systems.
DayStar won virtually every Mac editorial award given for product
excellence and had the top rated brand among peripheral manufacturers.

The uploaded file is the original floppy disk in Disk Copy 4.2 format,
compressed in friendly pre-5.x StuffIt format. Includes PowerCentral
2.0 control panel and DayStar PowerDemo 5.4 application.

Added the Daystar Universal Power Cache demo movie as second DL.
Still working with MacOS 7.6 and SheepShaver.

Download 3 has PowerCentral v2.2

Download 4 is FastCache 2.2

Go [here][1] for up to date drivers for your legacy DayStar product.

Compatibility
Architecture: 68k

Any mac with DayStar '030 PowerCache card installed.

  [1]: http://web.archive.org/web/20080511123533/http://daystartechnology.com/Daystar_Technology_Mac_Support/Daystar_Technology_Mac_Downloads/Daystar_Digital_Mac_Downloads/software/b_dsd_software_download1.html