@MrToast64
What a fantastic way of explaining this, Dave. Absolutely loved how you paced and connected everythign together in a very digestible format.
@stupossibleify
Timely video from my perspective! Back into 6502 after decades and loving it. Great video editing skills, btw, very polished episode.
@JohnMDiLiberto
Now, that is impressive. Well done!
@evilkittyofdoom195
First game I played on computer, loved the pet...
@JanBruunAndersen
At #08:50 - Instead of LDX #$00 you could just write LDX #0. Same with the zero byte for the text string. A simple 0 would do.
@seansretroverse9082
Awesome video, I really enjoyed it! I have had the mental thought process of disassembling before, and I am glad to see I was not terribly far off. I really am enjoying your channel, so you have my sub now!
@neleabels
22:52 Why should you need to recalculate the BNE address? It's only absolute in the assembly code, in machine code it's a relative jump which remains valid in relocated code (unless there is new code inserted between the branch and the target.) But anyway, thanks for this very interesting video!
@skeleton_craftGaming
I also would not be surprised if microdigital and the other companies still making 6502s [and yes you can buy a new 6502 today (well maybe not literally today today , but you know what I mean)] I have an instruction set appendix in them as well. I think Intel has their instruction reference on their website for free.
@piggypiggypig1746
Great video. Sub'd of course. Whenever I see 6502-related stuff on YT I have to immediately jmp straight to it like a nerd. Started my journey into assembly a few years ago but still have much to learn. Look forward to catching up with the rest of your videos. By the way, I wonder why they used so many NOP's at the beginning of their code?
@NotaWizard
Very cool Dave. Nice work! And thanks for showing the process.
@balorprice
Wow! New subscriber here, this is really usesful, thank you
@Nichetronix
Love that you use vi :-)
@CostumeJewelryHome
Does anyone know if KERNAL source code for the original Commodore PET is available? Original , not disassembly.
@uhertlein
Fantastic explanation of the whole process. One thing I was wondering about were the 9 NOP instructions at the beginning of the program. Do you know why they're there? I was wondering whether that might be space for some self-modifying code?
@carolinemathieson
I did something like this many years ago after graduating but before I started work to disassemble the Sinclair QL ROM. I used QLMON to do the dissasembly along with a lot of books to know what the system calls were. It was an interesting exercise but gave up eventually as I started a new job. I am curious what all those NOPs were at the beginning though, Scratch space, self modifying code or what?
@JanBruunAndersen
At #23:41 - I am a bit surprised that you were able to do a search and replace of $0428 without having to escape the $-sign.
@JanBruunAndersen
At #31:00 - I think it is a mistake at this point to add a new instruction to initialize the Y register. The safe method is to keep the code identical to the original, and compare the newly assembled binary code with original and make sure they are identical.
@theenglishman1312
I’ve been trying for years to find assembly to load and save areas of memory from disk , do you know any examples of this in assembler?
@8bittimes
IIRC you can load label files into VICE so that the disassembler shows the actual labels
@andrewdunbar828