#6502assembly — Public Fediverse posts

The #c64 maze game has been ported from #c64basic to #6502assembly too. And I've put both versions (as well as the assembly language source code) online at the project page https://shdon.itch.io/snake-temple

C64 Dev Machine Music Maker Adds Simple SID Composition
#Commodore64 #C64DevMachine #MusicMaker #SIDMusic #C64Coding #RetroDevelopment #6502Assembly #Polytricity
https://theoasisbbs.com/c64-dev-machine-music-maker-adds-simple-sid-composition/?fsp_sid=10373

Crazy One Card Game Arrives for the Commodore 64
#Commodore64 #C64 #CrazyOne #C64Games #RetroGaming #6502Assembly #HomebrewGames #CardGames
https://theoasisbbs.com/crazy-one-card-game-arrives-for-the-commodore-64/?fsp_sid=10363

Web64 IDE Development Brings C64 Coding Into the Browser
#Web64IDE #Commodore64 #C64Development #C64Coding #RetroComputing #6502Assembly #Commodore
https://theoasisbbs.com/web64-ide-development-brings-c64-coding-into-the-browser/?fsp_sid=10348

Castle Smash Release Brings Warlords-Style Battles to C64 and PET
#CastleSmash #Commodore64 #CommodorePET #C64Games #RetroGaming #Milasoft #6502Assembly #HomebrewGames
https://theoasisbbs.com/castle-smash-release-brings-warlords-style-battles-to-c64-and-pet/?fsp_sid=9802

Mac Release of C64 Dev Machine Brings Polytricity’s Tool to macOS
#C64DevMachine #Commodore64 #C64 #RetroComputing #6502Assembly #VICEEmulator #MacOS
https://theoasisbbs.com/mac-release-of-c64-dev-machine-brings-polytricitys-tool-to-macos/?fsp_sid=7129

C64 Assembly Looping Gets Practical in Coding with Culp Part 2
#Commodore64 #C64 #6502Assembly #64tass #RetroComputing #CodingWithCulp #C64Programming #AssemblyLanguage
https://theoasisbbs.com/c64-assembly-looping-gets-practical-in-coding-with-culp-part-2/?fsp_sid=6814

C64 Dev Machine Basics: Polytricity Explains the First Steps
#C64DevMachine #Commodore64 #Polytricity #C64Coding #6502Assembly #RetroComputing #VICEEmulator
https://theoasisbbs.com/c64-dev-machine-basics-polytricity-explains-the-first-steps/?fsp_sid=6774

This week on the blog: ...mostly showing my work for what fed into last week's post, actually. A line-by-line comparison of four implementations of the same function on four variously related retro architectures.

This is gonna be one of the crunchy ones that most folks will want to skip but that the folks who like it will *really* like, in my experience.

https://bumbershootsoft.wordpress.com/2026/05/09/comparing-an-lz4-decompressor-on-four-legacy-cpus/

#retrocomputing #z80 #6502assembly #8086assembly #intel8080

C64 Dev Workflow: Polytricity Tests C64 Dev Machine on the C64 Ultimate
#C64DevMachine #Commodore64 #C64Ultimate #Polytricity #C64Development #6502Assembly #SIDMusic #RetroComputing #Commodore
https://theoasisbbs.com/c64-dev-workflow-polytricity-tests-c64-dev-machine-on-the-c64-ultimate/?fsp_sid=6449

WolfsciiPack C64 Brings U-Boat Periscope Combat to Commodore 64
#WolfsciiPack #Commodore64 #C64 #RetroGaming #C64Games #Johnny5 #8BitGaming #ItchIO #6502Assembly #RetroComputing
https://theoasisbbs.com/wolfsciipack-c64-brings-u-boat-periscope-combat-to-commodore-64/?fsp_sid=6443

Visual Assembler 1.5.1 Brings C64 Ultimate Fixes And UI Polish
#VisualAssembler #Commodore64 #C64Ultimate #C64Coding #6502Assembly #RetroComputing #VICEEmulator #C64Development
https://theoasisbbs.com/visual-assembler-1-5-1-brings-c64-ultimate-fixes-and-ui-polish/?fsp_sid=6284

From the Dead X16 Gets a New Commander X16 Dev Update
#FromTheDead #CommanderX16 #AndyMcCall #RetroGaming #RetroComputing #6502Assembly #8BitGames #IndieGameDev
https://theoasisbbs.com/from-the-dead-x16-gets-a-new-commander-x16-dev-update/?fsp_sid=6266

C64 Visual Coding Advances with C64 Dev Machine V099.61.9
#C64 #Commodore64 #C64DevMachine #Polytricity #6502Assembly #RetroComputing #C64Coding #GameDev
https://theoasisbbs.com/c64-visual-coding-advances-with-c64-dev-machine-v099-61-9/?fsp_sid=6254

I came up with some 6502 assembly tricks:
- make N and Z flags reflect A (no side effects): AND #$FF (used in Excitebike; alternatives: ORA #0 or EOR #0)
- make N and Z flags reflect X (no side effects*): INX & DEX (or for Y: INY & DEY)

*If your interrupt routines don't access the value of X besides preserving it.

#6502assembly #6502_assembly

One other side effect of my return to C64 work is that I've become more irritated with the sharp edges of my Ophis assembler. So:

Announcing the release of Ophis 2.3! This expands the syntax a bit so that it plays nicer with other dialects and syntax highlighters.

https://github.com/michaelcmartin/Ophis/releases/tag/v2.3

#retrocomputing #c64 #6502assembly #python

6502 RTS Trick Explained in projectCD.Chronicles Video
#6502 #Assembly #Commodore64 #RetroComputing #Programming #projectCDChronicles #6502Assembly
https://theoasisbbs.com/6502-rts-trick-explained-in-projectcd-chronicles-video/?fsp_sid=3921

C64 Soft Scrolling Lessons
#C64 #Commodore64 #RetroCoding #8bitDev #AssemblyProgramming #6502Assembly
https://theoasisbbs.com/c64-soft-scrolling-lessons/?feed_id=5842&_unique_id=68ee4d5686276

C64 Assembly Shooter Code Breakdown
#Commodore64 #C64Assembly #RetroGameDev #6502Assembly #ShmupCode #MOS6502 #C64Programming #RetroComputing
https://theoasisbbs.com/c64-assembly-shooter-code-breakdown/?feed_id=4551&_unique_id=6888cb01e486d

Supernatural C64 Game Code: Part 40 in the Assembly Series
#C64Dev #Commodore64 #6502Assembly #GameDev #SupernaturalC64 #GunsNGhosts #RetroCoding
https://theoasisbbs.com/supernatural-c64-game-code-part-40-in-assembly-series/?feed_id=4522&_unique_id=6887787175dbb

K&A Plus Issue #28 Delivers Retro Goodness
#Commodore64 #Amiga #RetroGaming #6502Assembly #Demoscene #KandAPlus
https://theoasisbbs.com/ka-plus-issue-28-delivers-retro-goodness/?feed_id=4443&_unique_id=6880de82dfc18

Commander X16 65C02 Assembly Tutorial – Lesson 3: 6502 Assembly Branching Basics
#CommanderX16 #6502Assembly #RetroDesk #AssemblyProgramming #RetroComputing
https://theoasisbbs.com/commander-x16-65c02-assembly-tutorial-lesson-3-6502-assembly-branching-basics/?feed_id=3955&_unique_id=6859518e89893

Infocom Interpreter Hacking on Commodore PET
#CommodorePET #Infocom #6502Assembly #RetroComputing #Root42 #BitShifter #TextAdventures #Commodore64 #RetroDev #LiveCoding
https://theoasisbbs.com/infocom-interpreter-hacking-on-c64/

FairLight TV #120A, Fjälldata 2025 Trident Talk
#C64 #DemoCoding #RetroComputing #6502Assembly #Programming #Fjälldata2025
https://theoasisbbs.com/fairlight-tv-120a-fjalldata-2025-trident-talk/?feed_id=1803&_unique_id=67bc7dc0e0364

Current mood:

Resisting to rewrite @chriscovell's TapeDump into ca65, just because I don't want to run Dosbox to build it or modify it.

#TapeDump #NES #6502assembly

Learn Together - Atari 6502 Assembly Programming

https://video.mycrowd.ca/w/w7v5graRcYjEHXHWKduFGE

I'm making an interactive tutorial for building an NES sound driver.
This is the first exercise, which simply plays a square wave on the first pulse channel.
It includes a live text editor which assembles your code into an NSF and plays it in an emulator.
Live app: https://bobbicodes.codeberg.page/nerdy6502/
Source: https://codeberg.org/bobbicodes/nerdy6502

#chiptune #NESDev #JavaScript #6502assembly #programming

Someone reverse-engineered Apple ][ Choplifter, an amazing game from my youth. Awesome write-up of the process and link to the assembly code.

https://blondihacks.com/reversing-choplifter/

#reverseengineering #6502assembly #programming #apple2 #retrogaming #retrocomputing