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Groups > comp.sys.sinclair > #4137
| From | "Brian Gaff" <briang1@blueyonder.co.uk> |
|---|---|
| Newsgroups | comp.sys.sinclair |
| Subject | Re: How does a Spectrum emulator work? |
| Date | 2016-04-02 21:17 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <ndp96b$k9t$1@dont-email.me> (permalink) |
| References | <cb4d972b-4829-4377-b4f1-ce90924d0c7d@googlegroups.com> |
Not sure what you are asking. Many moons ago there was a dos program that emulated the z80 chip on other chips. Once this core is done then you presumably need to emulate the hardware of the target machine assuming it uses a z80.. To me this was always the hard bit, especially inside windows which tended to stop direct calls to the pc hardware completely. Its been a long time since I looked at any code, but a lot of it was written in other languages, depending on the machine and hardware. C is a common choice of course. Direct assembler has to run on the emulated chip of course. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... briang1@blueyonder.co.uk Blind user, so no pictures please! <bit-naughty@hotmail.com> wrote in message news:cb4d972b-4829-4377-b4f1-ce90924d0c7d@googlegroups.com... .... I remember having a small discussion with Gasman about this right here (and btw, Gasman, I'm still looking to get in touch with you, if you're reading this, please post here!), but I got to thinking about it, and..... how is it done? How do you actually *send* a stream of hex to your CPU? (I'm talking about the machine your emulator is running on,.. that is to say, in general, Mister Intel...) I mean, figuring out the Z80 code, and figuring out what it's Intel equivalent will be is obviously the *main* task of an emulator, and hard enough by itself, but... once you know what instructions you want to *send* to Mr. Intel, .... how do you do it? I once heard or read somewhere of a trick where you put an instruction on the stack (like, the hex code), and then do, essentially, a POP EIP (I'm using 32-bit terminology), but then what do you do if that instruction is a JMP? What is the actual _essence_ of emulation....? :) ...And of course THEN there is the question of how the actual *conversion* is done....I'm emphatically NOT a C programmer, so please don't tell me to read FUSE code or something, to figure out how THAT's done.... :)
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How does a Spectrum emulator work? bit-naughty@hotmail.com - 2016-04-02 09:40 -0700
Re: How does a Spectrum emulator work? Guesser <alistair@zxnet.co.uk> - 2016-04-02 18:14 +0100
Re: How does a Spectrum emulator work? jbkoelman.sp@gmail.com - 2016-04-02 12:43 -0700
Re: How does a Spectrum emulator work? "Brian Gaff" <briang1@blueyonder.co.uk> - 2016-04-02 21:22 +0100
Re: How does a Spectrum emulator work? jbkoelman.sp@gmail.com - 2016-04-02 13:49 -0700
Re: How does a Spectrum emulator work? Leiradella <aleiradella@gmail.com> - 2016-04-02 14:01 -0700
Re: How does a Spectrum emulator work? "Brian Gaff" <briang1@blueyonder.co.uk> - 2016-04-02 21:17 +0100
Re: How does a Spectrum emulator work? Leiradella <aleiradella@gmail.com> - 2016-04-02 13:56 -0700
Re: How does a Spectrum emulator work? Andre Majorel <cheney@halliburton.com> - 2016-04-06 11:56 +0000
Re: How does a Spectrum emulator work? Tyrell <on4ssc@gmail.com> - 2017-01-28 15:59 +0100
Re: How does a Spectrum emulator work? AndyW <Andy@nojunqmail.com> - 2017-01-30 07:33 +0000
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