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Comment by tyingq | Hacker News Reader

Easy 6502 is pretty fun as well: http://skilldrick.github.io/easy6502/

Since it's a javascript 6502 emulator, you get maybe 60% of the fun of programming for a C64, but just by visiting a web page. On a single page, they take you from making 3 colored pixels to a functioning snake game with explanations of what's happening along the way.

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Ah, last time I looked at this I thought, "This is cool but it's too bad it doesn't have EQU or some other way to give symbolic names to constants."

Now it does!

  define appleL  $00 ; screen location of apple, low byte

(Looks like the feature was added in November 2014.)

Impressive!!

Though I've never seen the Accumulator referred to as the "A register"...

LDA #$c0 ;Load the hex value $c0 into the A register

It is referred to that way in old datasheets: http://imgur.com/a/GlDiz

Interesting blog post that explains why one of the GP registers (EAX/RAX) in x86/x64 is also referred to as an accumulator: http://noeffclue.blogspot.com/2016/02/the-accumulator-regist...

I remember doing an assembler class where you needed to load something in A and B before you were able to perform an operation on it.

Older docs made this reference. I see someone else noted it too.

In my peer group back then, it was "load A" for LDA, not "load accumulator"

Sometimes A appears explicitly in the syntax of the INC instruction, depending on the assembler.

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