RE: Aaron Bartell's RPG/Java comparison

["Joe Pluta" <joepluta@xxxxxxxxxxxxxxxxx>]

I believe the following are the requirements:

Read from an address
Store to an address
Increment
Compare
Branch on condition

(The goto is a minimal form of branch on condition)

You need at least two registers to hold the data, and a way to use those
registers as a memory address.  Early CPUs had an accumulator and a second
register, and two special-purpose registers, which when combined were used
as a 16-bit memory address.

In fact, if you go back to the early 8080 CPU, there really wasn't a lot
more than that, except you had one extra register (C) to work with, a few
more arithemetic functions, and the ability to direct data to an I/O port
rather than a memory address.  Add instructions to enable/disable interrupts
and you pretty much had everything you needed to write an operating system.

Joe


> -----Original Message-----
> From: owner-java400-l@midrange.com
> [mailto:owner-java400-l@midrange.com]On Behalf Of Richard Dettinger
> Sent: Monday, February 26, 2001 9:13 AM
> To: JAVA400-L@midrange.com
> Subject: RE: Aaron Bartell's RPG/Java comparison
>
>
>
> Sorry, I couldn't help but jump in here.  Yes.  Proven
> mathematically.  You
> might next to no functionality in a programming language to be able to do
> any program needed.  Everything else is just there to make the
> programmer's
> life easier.  I could be wrong, but I thought all you needed was
> assignement and goto.
>
> Regards,
>
> Richard D. Dettinger
> AS/400 Java Data Access Team
>
> "Biologists have a special word for stability -- dead"
>
>                 Larry Wall
>                 Open Source Developers Journal
>                 Issue 1, Jan  2000
>
>
> "Stone, Brad V (TC)" <bvstone@taylorcorp.com>@midrange.com on 02/26/2001
> 07:34:39 AM
>
> Please respond to JAVA400-L@midrange.com
>
> Sent by:  owner-java400-l@midrange.com
>
>
> To:   "'JAVA400-L@midrange.com'" <JAVA400-L@midrange.com>
> cc:
> Subject:  RE: Aaron Bartell's RPG/Java comparison
>
>
>
> > I disagree 100% with your "point".  While it has been proven
> > mathematically that any progamming task can be performed by
> > any language with certain base functions, that by no means
> > means that "all languages are equal". \
>
> Proven mathematically?
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