>> "Just out of curiosity: how much does one pay for
such a kit? I don't know whether my wife would approve of a major investment
into something of little perceived value."
Hans-Martin,
Marriage is based on "give and take" -- sometimes one must
give excuses, while at other times it's necessary to take chances.
<G>
The Xilinx ML401 runs
about US$500.
Gary
----- Original Message -----
Sent: Thursday, August 02, 2007 2:29 AM
Subject: Re: [Hardware] language neutral
processors
Jecel Assumpcao Jr
schrieb:
> I am back from a nice vacation (my first since 1982...) and see
that you
> have all been waiting patiently for me to return before
starting any
> interesting discussions ;-)
>
Ok, now
that you're back, I can finally ask the questions which have
puzzled me ever
since :-)
When implementing Smalltalk hardware, what kind of object memory
design
would you prefer:
- object table vs. direct pointer
- ref
counting vs. generation scavenging cs -whatever-
- page-based virtual memory
vs. object-based VM vs. none at all
- in-band tags vs. out-of-band
tags
Let me explain the last one. Smalltalk Implementations have
typically
had in-bad tags, i.e. the tags have only meaning in a word which
is
known to be an oop. The Burroughs machines had out-of-band tags,
that
is, every memory word had an additional tag. That way, you could
even
know whether a memory word contained uninterpreted bytes, a float
value,
or an "oop" (descriptor).
> One interesting side effect of
this trip is that I now have a new FPGA
> development kit - the ML401 from
Xilinx.
>
Just out of curiosity: how much does one pay
for such a kit? I don't
know whether my wife would approve of a major
investment into something
of little perceived value
:-)
Cheers,
Hans-Martin
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