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Re: Codename G-OS
- Subject: Re: Codename G-OS
- From: fachat@physik.tu-chemnitz.de (Andre Fachat)
- Date: 1997/10/14
- Followup-to: alt.c64,comp.sys.amiga.emulations,comp.sys.amstrad.8bit,comp.sys.apple2,comp.sys.atari.8bit,comp.sys.cbm,comp.sys.m6809,comp.sys.msx,comp.sys.oric,comp.sys.sinclair,comp.sys.tandy
- Newsgroups: alt.c64, comp.sys.amiga.emulations, comp.sys.amstrad.8bit, comp.sys.apple2, comp.sys.atari.8bit, comp.sys.cbm, comp.sys.m6809, comp.sys.msx, comp.sys.oric, comp.sys.sinclair, comp.sys.tandy
- Organization: My org
- References: <34394CFA.MD-0.198.zhulien@alphalink.com.au> <61otr0$rge@nntp02.primenet.com>
Glenn Saunders (krishna@primenet.com) wrote:
: The mortal Lazy Bone wrote:
: : Platform CPU
: : Amstrad CPC Z80
[...]
: : Commodore 64/128 6502
[...]
: : MSX (various) Z80
: This much I can understand since they are all similar.
Except for the CPU. most have a Z80, while the C64 has a 6502.
: a CPU with enough features to support preemptive multitasking.
Well, even a 6502 can do that. Look at
http://www.tu-chemnitz.de/~fachat/csa
: None of the 8-bit systems would qualify, and the overhead of a HAL is
: probably too much for a 64K RAM system anyway, that you'd get more
: mileage out of their native OSs.
That, on the other hand is true IMHO. If you could write a
HAL and p-code interpreter for an 8 bit machine, it would eat
up already quite some amount of memory. For the application not much
would be left. Probably a single-tasking OS would work.
But running a multitasking system like that, with an appropriate
speed?
Well, anybody said that real multitasking would be impossible on a
6502, and I (amongst others) did it, so I should probably
shut up. But I think that only precompiled code would run well
on an 8 bit machine. And then you still have to handle relocation
and linking (shared libs) questions.
(See also on my homepage for the OS/A65 operating system for a
filesystem standard for 6502 programs.)
Andre
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Andre Fachat, Institute of physics, Technische Universit�t Chemnitz, FRG
http://www.tu-chemnitz.de/~fachat