Re: [BLACKBOX] Ofront released as open source under a FreeBSD-style license

From: Oleg N. Cher <"Oleg>
Date: Wed, 25 Apr 2012 10:45:43 +0300

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Dear Norayr,

In ZX Spectrum is used not 8080, and Z80 CPU.
Z80 is compatible with 8080, but has many of additional instructions
for bit manipulation, copying of memory blocks, additional index registers
(IX, IY). I met utterances of the people that name Z80 the most complex
8-bit CPU in the world.
Maybe it is so. Also Z80 is downward compatible with 8080. For code
generation for Z80 I've used
Small Device C Compiler. It is very good optimizing compiler for several
targets, but clear 8080 CPU
is not supported however.

Ulm's Oberon library - is it for Linux only? I understand it so.

About minimal size of the binary I get for Z80. If take the empty module:

MODULE HelloWorld; IMPORT B := Basic; PROCEDURE Main* ; END Main; END
HelloWorld.

that file HelloWorld.bin occupies after compiling 2 bytes: #C9#C9 (RET RET).
Overhead in one byte that, seems not so bad.

If simply add one call B.Init, that the binary will become the size 2098
bytes.
The Procedure Basic_Init occupies whole several bytes, signifies this
overhead of SDCC.
I think it is possible to reduce this overhead. I some experiments with
it and I see that
there is not smart-linking in SDCC. All code of module Basic is added to
the binary.
I planned to write e-mail to Philipp Klaus Krause (it's a main
architector and maintainer
of Z80 code generator in SDCC) to as him about this overhead
particularities.

But, as we understand, it is not a problem of Ofront. It is a problem of
back-end (SDCC).
Was me able to cut out the garbage collector? Of course,
in my ZX Spectrum games in Oberon I did not use it.

http://zx.oberon2.ru/dash.htm
http://zx.oberon2.ru/durak.htm

It's no problem to not use garbage collector in Ofront. :) There is
possible to declare
untagged pointers and work with memory manually.
Norayr, have you some projects for Nintendo written in Oberon-2 / OO2C?
I interested in Nintento as a platform to XDev project. Software
development for Nintendo in Oberon-2 :)

Please try to understand ZXDev documentation over Google Translator, it
you'll have additional questions,
e-mail me. I'll expect your e-mail.


 Chilingarian wrote:
> Hey, Oleg.
> Before this I was mostly concentrating on oo2c.
> For example, I have published nmos6502 port of oo2c (via cc65) but not
> the Ofront version. http://sourceforge.net/projects/nmos6502-oo2c/
> nmos6502 is the processor used in the Nintendo, Apple][ and Oric Atmos (:
> I've also dived into H2O sources in order to find out how hard would
> it be to modify it to work with Ofront.
> However because of the previous Ofront license I didn't have much
> inspiration to work.
> I've also did some work to bring Ulm's Oberon library to oo2c. I would
> like to try to do the same with Ofront.
> There may be a problem to link GPL code to FreeBSD code though.
>
> What is the minimal size of the binary you get for 8080?
> Was you able to cut out the garbage collector in order to reduce the
> size of the resulting binary?
> Ah, I must probably go by the link and try it myself.
>
> I'll write you an email, it's interesting to communicate as were
> engaged in the similar projects.
>
> Norayr

-- 
Oleg N. Cher
http://zx.oberon2.ru/
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Received on Wed Apr 25 2012 - 09:45:43 UTC