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Re: [Qemu-devel] [PATCH] Z80 emulation updated again!

From: Artyom Tarasenko
Subject: Re: [Qemu-devel] [PATCH] Z80 emulation updated again!
Date: Tue, 21 Dec 2010 12:14:26 +0100

On Tue, Dec 21, 2010 at 10:25 AM, Alexander Graf <address@hidden> wrote:
> On 21.12.2010, at 02:24, Andreas Färber wrote:
>> Am 21.12.2010 um 01:10 schrieb Alexander Graf:
>>> On 21.12.2010, at 01:06, Andreas Färber wrote:
>>>> Am 20.12.2010 um 23:45 schrieb Alexander Graf:
>>>>> On 31.05.2009, at 17:20, Stuart Brady wrote:
>>>>>> Here's an update of the Z80 system emulator, which currently emulates
>>>>>> the ZX Spectrum only. [...]
>>>>> [...] do you think it's a valuable target to have in upstream qemu?
>>>> The z80 was also used in the more modern TI-83 Plus programmable 
>>>> calculator [1], for instance
>>> The general I/O framework is heavily geared towards server and desktop use. 
>>> The main use case of the Z80 that I'm aware of is the GameBoy. Not sure 
>>> that one fits in there too well :).
>>> The Spectrum however does fit the desktop case, so it certainly has my 
>>> blessings.
>> Knowing the ZX Spectrum only from the attic, I agree that emulating game 
>> consoles is not the primary purpose or strength of QEMU.
>> (Although I wouldn't mind if someone wanted to contribute a PS3 machine for 
>> Cell B.E. emulation!)
>> Fwiw mips, arm, m68k, cris, microblaze seem to form a growing third category 
>> of QEMU targets though, embedded systems.
> Oh, sure. I'd count in embedded systems here too. My main point was that we 
> don't have frameworks to deal with Joysticks, 3D or other stuff real game 
> system emulation would need.

With the emulation of the ancient machine based game platform it is
even more complicated: games expect some certain timings from the CPU,
graphic and sound cards. So, I'm not sure if TCG can be used for it.

> To be honest, maybe creating a library out of the CPU emulation code that 
> projects like MAME could then use might prove more beneficial. I've thought 
> about this for plenty other projects too. GBA emulation could use ARM TCG, 
> Dolphin could use PPC TCG, etc. But none of these actually require our device 
> model - they already have their own.
> Alex

Artyom Tarasenko

solaris/sparc under qemu blog: http://tyom.blogspot.com/

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