The Usenet Oracle has pondered your question deeply.
Your question was:

> Our Oracle who art in Indiana, hallowed be thy domain name, please tell
> me:
>
> What are the 15 Workstations of the Cross?

And in response, thus spake the Oracle:

No such thing.  But here are the Greater Trumps ...

0. The FOOL: a manager using a SPARCStation 413,1432 to run a
   screensaver.

1. The MAGICIAN: a hacker with a Mac, a Pentium box, a Sparc, and a
   Cray on the table in front of him --- all running the same program
   with the same GUI.  An infinity sign is over his head.

2. The HIGH PRIESTESS: a woman holding the Documentation, closed and
   concealed.  The crescent moon is showing on an Indigo behind her.

3. The EMPEROR: Steve Jobs sitting on a NeXT cube, holding an optical
   disk vertically in his hand.

4. The EMPRESS: A secretary with a NeXT Machine.

5. The HEIROPHANT: Bill Gates with two flunkies kneeling before him,
   their faces averted, offering him floppy disks.  He wears a laptop
   computer on his head.

6. The LOVERS: a PowerMAC and an IBM Power PC exchanging software as
   an angel bathed in glory regards them.

7. The CHARIOT: A man in a chariot, hurtling up an exponential curve,
   drawn by the twin sphinxes of Technology (black) and Culture
   (white).

8. STRENGTH: A woman holding the entire design and implementation of
   Microsoft Excel in her mind as she corrects the final error.  An
   infinity sign is over her head.

9. The HERMIT: An old hacker, white-bearded,  burns the midnight oil;
   its Star-of-David flame illuminates his keyboard.

10. The WHEEL OF FORTUNE: A rotating wheel.  Cray is on the side going
    down, despite its good technology; Smalltalk is opposite it, and
    C++ is sitting on top.  Four winged beings -- a mouse, a turtle, a
    dog-cow, and a human -- look on.

11. JUSTICE.  A cold-faced woman holds a calculator in one hand and a
    delete-key in the other.

12. The HANGED MAN: A programmer is tied by his ankle to a cable duct.
    His phase is completely shifted: he awakens at sunset, he sleeps
    at dawn.  His monitor is reverse-video.  He programs on,
    flawlessly, oblivious to his circumstances.

13. DEATH: A skeleton weilding a scythe surveys a field, on which are
    scattered PDP-11s, Apple ]['s, IBM 360/91's, Xerox Alto's, and
    many other machines.

14. TEMPERANCE: An angel stands with one foot on her chair and one on
    the floor, as she copies files from one disk to another.  A cursor
    blinks from her chest.

15. The DEVIL: The goat-headed Lord of the Pit stands on a pile of
    Windows manuals, holding an inverted torch in one hand.  Two
    humans, male and female, are in chains at his feet.

16. The TOWER: An ivory tower is struck by a bolt of lightning.  Two
    robed figures, denied tenure, are hurtled to the ground.

17. The STAR: A Mac is running its `warp' screen saver, in a transient
    fragile moment of peace.

18. The MOON: A wolf and a jackal are typing at two PC's.  A crayfish
    crawls out of a pool, offering suggestions that may ultimately
    prove deadly.  The moon shines through a window.

19. The SUN: A naked child riding a winged rocking horse programs
    clever applications on a high-quality workstation.

20. JUDGEMENT: An angel blows a trumpet; all over the net, web pages
    arise, to be rated Cool or not.

21. The WORLD: A woman dances on the clouds, unclothed, unencumbered,
    in a ring of clouds, a 3-d mouse in each hand.  The four winged
    beings from the Wheel of Fortune surround her.