Download it
The patch:
Patch to Second Reality
This patch fixes the slow-down bug in Second Reality:
In some machines (especially new fast ones) the demo seemed
to crawl at an incredibly slow rate (1-5 frames/sec). This
was caused by differences in motherboard timer operation.
Once we found a single motherboard with this bug, we were
able to fix it.
More info
Excerpt from the info file
HARDWARE REQUIREMENTS AND OPTIONS
---------------------------------
This demo requires a 80386 processor and 570 000 bytes of
free conventional memory.
With Sound Blaster and Sound Blaster Pro you will need an
additional 1 megabyte of EMS. With the Gravis UltraSound
and the No Sound-option no EMS is needed. You can choose
the desired sound card and the mixing frequency from the
SETUP screen when you run the demo.
To be able to really experience this demo, we recommend that
you have a 486-based machine, a fast VGA card and a sound card.
If your machine is 386-based, the demo will work, but many
parts slow down and the demo simply looks worse.
If you have a DOLBY SURROUND decoder/amplifier hooked up to
your hi-fi set, have it on-line while running this demo and
you will get some cool surround sound effects.
(Surprisingly, does not work with the normal Sound Blaster).