FPGAs, unobtanium and FPJ11s

[Paul Anderson]

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:
> >>
> >> 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.
>
> 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.
>
> > 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
>