Release Ophis 2.3 · michaelcmartin/Ophis Ophis 2.3 has been released! This release mostly adds some convenient alternate syntaxes to allow Ophis to more easily interoperate with other assemblers, or to render more cleanly on syntax-aware ...

I've released a new version of my 6502 assembler "Ophis", mostly with some quality-of-life syntax extensions.

github.com/michaelcmart...

#retrocomputing #6502assembly #c64

6502 RTS Trick Explained in projectCD.Chronicles Video - The Oasis BBS 6502 RTS trick gets a clear breakdown in this new projectCD.Chronicles video, showing a smart way to handle 6502 program flow.

6502 RTS Trick Explained in projectCD.Chronicles Video
#Assembly #Commodore64 #RetroComputing #Programming #projectCDChronicles #6502Assembly

theoasisbbs.com/6502-rts-tri...

Handwritten algorithm in 6502 assembly language to convert ASCII characters representing hexadecimal digits ('0'-'9', 'A'-'F') to the corresponding hexadecimal value. Conveniently, ASCII for character '0' is 30 in hex. However, character 'A' (41 in hex) does not follow right after character '9' (39 in hex).

The following algorithm written in #6502assembly checks whether ASCII character loaded in the 8-bit accumulator is a hexadecimal digit ('0'-'9', 'A'-'F'). In case it is a hexadecimal digit, the corresponding value from 0000 to 1111 is stored in the low nibble of the accumulator.

C64 Soft Scrolling Lessons - The Oasis BBS Highlander71 explains C64 soft scrolling challenges, timing tricks, and how double buffering helps avoid color RAM glitches.

C64 Soft Scrolling Lessons
#C64 #Commodore64 #RetroCoding #8bitDev #AssemblyProgramming #6502Assembly

theoasisbbs.com/c64-soft-scr...

C64 Assembly Shooter Code Breakdown - The Oasis BBS Explore a C64 vertical shooter’s assembly code structure in this insightful breakdown, packed with resources for retro game developers.

C64 Assembly Shooter Code Breakdown
#Commodore64 #C64Assembly #RetroGameDev #6502Assembly #ShmupCode #MOS6502 #C64Programming #RetroComputing

theoasisbbs.com/c64-assembly...

Supernatural C64 Game Code: Part 40 in the Assembly Series - The Oasis BBS In Part 40, The Highlander71 codes enemy spawn logic in Supernatural C64 game code using C64 Studio and 6502 assembly.

Supernatural C64 Game Code: Part 40 in the Assembly Series
#C64Dev #Commodore64 #6502Assembly #GameDev #SupernaturalC64 #GunsNGhosts #RetroCoding

theoasisbbs.com/supernatural...

K&A Plus Issue #28 Delivers Retro Goodness - The Oasis BBS K&A Plus Issue #28 features game reviews, assembly tutorials, and demoscene coverage across 82 glossy pages.

K&A Plus Issue #28 Delivers Retro Goodness
#Commodore64 #Amiga #RetroGaming #6502Assembly #Demoscene #KandAPlus

theoasisbbs.com/ka-plus-issu...

Learn 6502 Assembly Branching With The Retro Desk earn 6502 assembly branching with flow control, loops, and subroutines on the Commander X16 in this hands-on Retro Desk tutorial.

Commander X16 65C02 Assembly Tutorial – Lesson 3: 6502 Assembly Branching Basics
#CommanderX16 #6502Assembly #RetroDesk #AssemblyProgramming #RetroComputing

theoasisbbs.com/commander-x1...

Executing longer programs faster, you can stop and step at anytime as well as watch the flags and registers and check on memory at anytime. #assembly #6502assembly #debugger #debug lostsidedead.biz/6502

Infocom Interpreter Hacking - The Oasis BBS Root42 tackles Infocom interpreter hacking live on the Commodore 64. Watch retro coding chaos and creativity unfold in real time.

Infocom Interpreter Hacking on Commodore PET
#CommodorePET #Infocom #6502Assembly #RetroComputing #Root42 #BitShifter #TextAdventures #Commodore64 #RetroDev #LiveCoding

theoasisbbs.com/infocom-inte...

FairLight TV #120A, Fjälldata 2025 Trident Talk - The Oasis BBS Learn how to dramatically increase your C64 demo coding efficiency with two simple tricks: Anonymous IRQ Handlers and Proto Threads.

FairLight TV 120A, Fjälldata 2025 Trident Talk
#C64 #DemoCoding #RetroComputing #6502Assembly #Programming #Fjälldata2025

theoasisbbs.com/fairlight-tv...

6502 Carry Flag Cheat Sheet v1.0 : David Youd : Free Download, Borrow, and Streaming : Internet Archive 6502 Carry Flag Cheat Sheet v1.0(thanks to Robin and qkumba for a few suggestions)

My #6502assembly carry flag cheat sheet
archive.org/details/carr...