What does each assembly do?

[hoyitt]

Hello.

I'm studing Gagatron ROM files and having some problems with machine codes.

What does 'st' mean?

001f d619 st [$19],y

I think it means 'store AC value to both RAM [$19] and Y register.' Is it right?

Is there a document that contains a description of the assembly?\

please help our team~
thx~ have good day

[at67]

Yes that's correct.

Documentation is here:

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https://gigatron.io/?cat=1

You can also single step through ROM source code in my emulator package and watch exactly how the native instruction works.

[hoyitt]

Thank you for your answer.

Can you give me your emulator link?

[at67]

Emulator:

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https://github.com/at67/gigatron-rom/tree/master/Contrib/at67

Various HW/SW links:

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https://forum.gigatron.io/viewtopic.php?p=1592#p1592