FPGAs and PDP-11's

From: Hans B Pufal <hansp_at_digiweb.com>
Date: Sat Aug 28 13:16:00 1999

Richard Erlacher wrote:

> I've taken a good hard look at implementing the 6500 core in XILINX and find
> that performance, which is VERY much of interest, is impacted most by ALU
> design.

No-one has mentioned the free IP project at <http://www.free-ip.com/>
which has a VHLD implementation of a 6502 now available. No idea of
performance on this, I have just begun to dabble in this area.

I too bemoan the fact the full configuration specs are not availble for
the FPGA's.
A few years ago I was working for a company that had a Xilinx part
monitoring a processor bus. We wanted to dynamically reconfigure the
FPGA so that we could change the bus pattern it triggered on - no joy
though geting the necessary info.

I see implementing old processors in FPGA's as a way of preserving those
the design of those processors. Yes, we would all prefer to have an
original, but practically speaking that is not possible.

For some uses, a modern re-implementation or an emulator is better than
nothing at all.


Hans B Pufal Comprehensive Computer Catalogue
<mailto:hansp_at_digiweb.com> <http://digiweb.com/~hansp/ccc>
Received on Sat Aug 28 1999 - 13:16:00 BST

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