It is well known that the 6502 is good to simulate/emulate other processors. A simulator for the 8080 was written in the 70s. It is quite natural to enhance this emulator for the Z80. I have had an experience of converting of the PDP-11 code to the 6502 - it was quite easy. Recently, I have discovered that there was the 6502 software that used code that was a directly converted 8086 assembly! You can read about this in the end of this document.

However we have some mystery about this OS and muLisp for the 6502. The main Apple II archive - apple.asimov.net - doesn't have either Adios-81, or muLisp. Thus it seems, this software was actually not released. It would be very interesting if somebody can share some information about this topic.

BTW I was able to find muLisp only for the Apple II Z80 card. There was muMath-80 for the Apple II but it didn't use muLisp.

There is another document that shows that muLisp for the 6502 was probably released...

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my blog about processors

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

Thank you. It is corrected.

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my blog about processors

Nice find! Here's the snippet:




Here's the snippet:



:rolls eyes:

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

It ain't what you know, it's what you know that ain't so.

It seems that the matter what is an emulator and what is a simulator is controversial - https://www.pagetable.com/?p=824 - so I have just reverted some my corrections.

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my blog about processors

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

There's plenty of scope for miscorrection, and we see it often in threads like these.

'definition' is more slippery than you might think. If you're over 30, language has probably already changed since you learnt it. If your teachers were over 30 when they laid down the law, they were probably already at variance with usage.

Many of us here are over 50...

This isn't a case of a malapropism, it's a different thing.

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

IMHO word "emulator" is used more often by software people and word "simulator" by hardware people. The latter usually use simulators to design new hardware or to test the existent iron. The former use emulators just as substitutions for hardware. I really don't know what is 100% correct but we know that an exception may be more important than the rule.

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my blog about processors

Back in the day, a hardware person would be more likely to have come across the idea of an In Circuit Emulator, and a software person would be more likely to have come across the idea of software emulation (often for some compatibility reason.) In both cases, it would be common to use just the one word, and it would be natural to come to think that this is the usual, or even the correct, meaning of that word.

It is also normal for two, three, or four decades to go past, and not to update one's idea of the meanings of words as the world turns.

In the meantime, some millions of people bought and used microcomputers. And more time passed. And now, some large number of people - perhaps millions - will want to play microcomputer games and run microcomputer software on their modern computers and laptops. And the term they use, overwhelmingly, is emulator.

And, despite what an older person might have learned long ago, those people are also right.

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

A simulator gives some sensation that something is real but only partially. You can use a flight simulator to get some real flight sensations but you can't get all the flight sensations via an simulator. On the contrary, an emulator just substitutes things. You can use a computer emulator instead of a real computer. So both words are correct to use about the 6502 emulating/simulating the 8080 because the 6502 with the 8080 simulator software may be used as a real 8080. A simulator imitates only several features of the original but an emulator imitates all important features.


The site title is "Emulating the Intel 8080 on a MOS 6502".

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my blog about processors