[Coco] A 6809 Compatible Core in Oct. 1988?
jdaggett at gate.net
jdaggett at gate.net
Mon Oct 4 18:07:55 EDT 2010
Not necessarily so. It looks as if this HDL language is based on Pascal. Most high level
programming languages use English for the language syntax. Comments can be in the native
language. If you look at languages like Pascal, C, ADA, COBOL and manyothers of that era,
the syntax for the compilers are all English.
VHDL is patterened after ADA which is similar to Pascal. I would not be at all surprised if
HHDL is a predicessor to VHDL. CHDL was first standardized in 1987 if I remember correctly
and was first primarily a synthesis language so that a main frame computer could synthesize
a behavior modrl of a chip or circiut. It later moved into actual compiling to generate actual
circuits from cell libraries. This is where VHDL does exceed over Verilog is in simmulations.
But not by much. Both Verilog and VHDL have their strengths and weaknesses. Verilog
seems to have garnered a larger portion of the HDL design language now for ICs.
On 4 Oct 2010 at 15:40, Little John wrote:
> One thing I didn't understand is that the HDL comments in the code are in
> English, but the entire rest of the document isn't. This might perhaps mean
> there is an english version floating around out there. I'll do some
> ----- Original Message -----
> From: <jdaggett at gate.net>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Monday, October 04, 2010 2:57 PM
> Subject: Re: [Coco] A 6809 Compatible Core in Oct. 1988?
> > Interesting. WOuld be better if it were in English.
> > What I find interesting is seeing the early HDL language. The HDL predates
> > VHDL and
> > Verilog. Probably one of the first attempts to code a processor and be
> > able to simulate it on a
> > main frame computer prior to committal to silicon. Prior to the early 90's
> > a chip as complex as
> > the 6809 was too large for a single simulation. Computer simulation was in
> > its infancy during
> > the 80's. In the early 80's it was almost unthinkable to simulate a
> > complete microprocessor
> > on a mainframe computer.
> > Today there is not a chip that goes out to fabrication without intense
> > simulation and HDL
> > design.
> > james
> > On 30 Sep 2010 at 0:35, Little John wrote:
> >> I came across this a few moments ago and although I can't read the
> >> language, it appears to describe a 6809 compatible CPU core in October of
> >> 1988:
> >> http://alexandria.tue.nl/extra2/afstversl/E/302417.pdf
> >> It is a 205 page document.
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