Writing 6502 Assembly Language on a Commodore VIC-20 using Label Assembler Development System (LADS)

Writing 6502 Assembly on a Commodore VIC-20 using the Label Assembler Development System (LADS)
0:00 Introduction
0:43 Typing in MLX
1:04 Moving memory around
2:17 Typing in LADS w/ MLX
5:26 Writing Simple Code
7:39 Assemble the Simple Code
9:11 Assemble to memory
10:50 Assemble to file
12:54 Creating a subroutine
18:54 Chaining source files
21:11 Fixing a simple bug
22:15 Finish

[@BillAnt]

My favorite VIC/C64 programming channel along with 8-Bit Show And Tell.... keeping this old mind ticking again after some 40 years. :)

[@JoeBurnett]

This brings back so many GREAT memories! Thank you!

[@DerykRobosson]

20:17 That temporarily broke my brain with the back to back LDA immediate calls as I incorrectly mistook the colon for a semicolon of the line stacked STA absolute memory positions used by the subroutine.

[@hmoazed]

Great video, thanks! One very minor thing, ASL is Arithmetic Shift Left, not Accumulator Shift Left - I know I know, I'm nitpicking :)

[@MyDeveloperThoughts]

Ahhh I fumbled that. Thanks for the correction.

[@winfr34k]

Just found your channel looking at all kinds of assemblers. Thanks for this demonstration!

[@8BitNaptime]

Wow, I also spent a lot of time typing in LADS from the book and it never worked for me. I think I might take a look now.

[@takingbytes1265]

If I get my Vic by the weekend I'm going to try out LADS. Though Instead of doing MLX I will try writing a basic program that reads a disk txt file of the program listing. I have done something similar with my Atari XL.

[@RonHelton]

👍👍👍👍👍👍👍👍

[@randylahey1232]

Idk how anyone can understand and memorize all this🤯

[@BillAnt]

It's called the "programmer type", a geeky super-human. ;)

[@randylahey1232]

@BillAnt I only watch this guys videos because I'm completely baffled lol

[@BillAnt]

@@randylahey1232 - lol .. Well hopefully you'll learn something. :)

[@randylahey1232]

@@BillAnt not likely🤣

[@miselzivanovic2181]

That's nothing compared to x86 or Amiga assembly language. Check one of those videos and you'll see 8bit assembly is easy as drinking water 😆

[@robertusa1234]

Is the drive sound an effect or did you hook up a 1541 to what ever computer you running the emulator on

[@MyDeveloperThoughts]

The sound is from the emulator. This emulator also lets me build the dream C64 from my youth; I can attach 4 virtual disk drives to it, expand the memory to 256k (probably more), all sorts of neat stuff.

[@FirstLevelMagic]

I don’t think I’d be surprised if sooner or later you run through writing the ML by hand and POKEing it in at the basic prompt.

[@MyDeveloperThoughts]

Hmmmmmm now that's an interesting idea

[@vadiks20032]

3:45 i don't exactly get what you just printed out. what are these numbers? are they like, decimal representation of a program? you copy the literal compiler/text editor with raw decimal represented data?

[@MyDeveloperThoughts]

Yep, it's a printout (Back before disks and CDs came with books) is a listing of the raw binary of the software where each 3 digit number is a byte of the program.

[@MyDeveloperThoughts]

archive.org/details/ataribooks-the-second-book-of-machine-language/page/n451/mode/2up This is a PDF of the book in the video.

[@vadiks20032]

@@MyDeveloperThoughts i see. wow, amazing to think that the program was so small you could literally rewrite it manually with binary representation

[@Pythoner]

why

[@jeffspaulding9834]

'Cause it's a lot nicer than poking machine code into memory.

[@miselzivanovic2181]

Poke 53280, x : Poke 53281, x ; Poke 646, x 🤔 Oh yeah, that'll do ✅😉... On C64 Lda #$xx (0-F) Sta $d020 Lda #$xx (0-F) Sta $d021 Rts Nicely done btw. Thx 🙏 Never had VIC 20, only C128, later C64.

[@BillAnt]

Wait, you had a C128 before a C64? lol (jk).

[@miselzivanovic2181]

@@BillAnt Amazing 😁 My parents bought me a C128... I bought myself a C64 later with a 1541 drive... and much later I bought a C128D and Plus 4... And later than much later, I got 1541 II, 2x 1571... However, I never owned 1581... All collecting dust now (I blame emulators, lack of time and Amiga and Duke Nukem 3D -> made me switch to Bill Gates back in the days 🤫)