25 Nov
2006
25 Nov
'06
4:34 p.m.
The EIS chip for the M7264 and the M7270 was referred to as the 3B5, being
the last 3 digits of the part number. Tere are still a few out there. You
could also upgrade the 03 to a 23 or 23+, and use the M8188 card. I'm
pulling these numbers from the top of my head, so they may be off.
Paul
On 11/25/06, Pete Turnbull <pete at dunnington.plus.com> wrote:
Roger Ivie wrote:
On Fri, 24 Nov 2006, Richard wrote:
I think you're confusing this with 11/23, or maybe 11/40 options. There
is a microcode ROM for the 11/03, which contains EIS/FIS (ie, both the
Extended Instruction Set and the Floating Instruction Set). It's called
KEV11, not FIS-11. There is a FIS option (and a separate EIS option)
for an 11/40. However, the FIS is not the same as other PDP-11 floating
point instructions. For a start, it's all stack-based (no register
operations) and it uses a different floating point format. Which is why
the opcodes are different too.
There's a similarly-named option called KEF11 for an 11/23, which does
implement the normal PDP-11 floating point instructions (in microcode).
It needs the MMU present, because it uses registers in the MMU; it
doesn't implement EIS because the basic 11/23 KDF-11 chipset already has
EIS, unlike the KD-11 chipset in the 11/03. It doesn't implement FIS
either, because there's no point. There is also a quad board with a
floating point processor which plugs into an 11/23 (or 11/24) instead of
the KEF-11; this is called an FPF-11, and it doesn't need the MMU
registers because it has its own.
I've never heard of an FPP-11. There are several FP11-x boards for
Unibus machines.
Would it be possible to do the same sort of trick with the LSI-11?
I've got an 11/03 and it would be nice to have floating-point :-).
There were a couple of floating point options for 11/03. I haven't
actually seen either.
The first, FIS-11, was a ROM that goes into the empty socket.
The second, FPP-11, was an add-on board that connected to the 11/03 via
the empty socket. As I understand it, the empty socket could be
used for either floating
point or the commercial instruction set. Since there's only one empty
socket, you can't have both floating point and the CIS.
There's no CIS for an 11/03; there is a CIS option for KDF-11 machines,
which consists of a carrier that plugs into a *pair* of microm sockets
on an 11/23 or 11/24. The carrier holds six chips. There's also a CIS
for the 11/44 (two board set).
There's also a writable control store,
WCS-11, that plugs into that
slot.
Yes, that's a KUV-11, M8018. I suppose if you could fit the floating
point instruction set into 1024 microcode words, you'd almost be able to
implement floating point -- but there would still be no registers
available to operate on.
--
Pete Peter Turnbull
Network Manager
University of York