I don't
currently have a DRX2, but I do have a DRX, which is essentially
the
same thing without the clock doubled core. The
L1 cache made it about 20%
faster than an equivalently clocked 386. You had to explicitly turn on
the
cache, and set regions as uncachable. (Caching
the video card usually
made
for problems.)
Guess I want the DRX2 then. No sense in spending all that time on something
just to have it be less than optimal. I'll have to dig up reference sheets
on 'em.
BTW, what do you run on the DRX? I'm upgrading an IBM P70 luggable, the
target OSes are AIX-PS/2 and Solaris in particular, and then as many others
as will work.
Sorry for the delayed response. I've used Linux, OS/2 Warp and Win3.1 on them.
Right now it's an OpenDOS machine.
Turning on internal cache requires ring 0 access. OS/2 required a device driver at
startup. Win 3.1 and DOS run a program from autoexec.bat. ISTR that the linux
kernel had support built in for the DRX. I don't know about AIX and Solaris.
There are also later model BIOS versions that turn on the cache at boot. I
don't know if the P70 would have that l turn on the cache at boot. I don't
know if a P70 would have an appropriate BIOS.
Eric