11 Jan
2004
11 Jan
'04
6:38 p.m.
On Sun, 11 Jan 2004, Antonio Carlini wrote:
Me too. I've got the 1991 version of the book. Table 11.1 on page 417
lists both the MicroVAX-I/D and MicroVAX-I/G as having support for
PDP-11 mode. I did misread the lines for the 82xx and 83xx processors;
it's only the 86xx series which have them.
So one of those versions of the VARM is wrong about the MicroVAX-I,
I'm guessing it's probably mine. I suspect this because, at the back
of the same book on page 538, under the B.2.6 MicroVAX-I heading, it
states, "The MicroVAX-I processor includes some of the optional string
instructions (CMPC3, LOCC, SCANC, SKPC, and SPANC) but does not include
any of the optional processor registers or PDP-11 compatibility mode."
-brian.
I just noticed
something for the first time in my VARM.
According to table 11.1, the MicroVAX-I supports the VAX's
PDP-11 emulation mode. The only other models that also
support this are the 11/7xx series, the 82xx, 83xx, and 86xx
systems--and they're all rather larger than a MicroVAX-I.
My VARM states, on page 378 (in Appendix B, if you have a
different version) that the uVAX I does NOT have PDP-11
compatibility mode.
Mine's the 1987 version that has Figure 11.1 but no
Table 11.1. Chapter 11 is "Architectural Subsetting".
Regardless of what any book says, I'd be stunned if
they squeezed compatibility mode into the uVAX I.