4 Jan
2007
4 Jan
'07
11:08 a.m.
Peter C. Wallace wrote:
Actually, now that I think about it, that's true -- partly. It just
didn't work properly in 64-bit mode, and so all the systems it was ever
used in (SGI Crimson and Indigo, mainly) are 32-bit systems and the CPU
is fixed in 32-bit mode, with 32-bit registers and a 32-bit bus.
The R4400 and R4600 were fixed, but the only R4400 system I know of that
was 64-bit capable was the top end SGI Challenge, and I don't know if it
was ever supported in that mode (the R8000 Challenge and Onyx systems
were the first ones with 64-bit support). I don't know of any R4600
64-bit systems, and the later R4xxx devices are mostly 32-bit chips
anyway (like R4300).
--
Pete Peter Turnbull
Network Manager
University of York
On Thu, 4 Jan 2007, Pete Turnbull wrote:
Sridhar
Ayengar wrote:
No, The R4000 is 64 bits and probably the first 64 bit Microprocessor... Eric J Korpela wrote:
R4000 is only 32-bit, though. Has any 64-bit microprocessor been
declared officially vintage yet?
I already mentioned the Alpha 21064, but I believe the MIPS R4000 was
even earlier.