New Tool: 6502 Debugger
Built a browser-based 6502/6510 assembler and live debugger — all 56 opcodes, step execution, live registers and flags, and a hex memory inspector. No install needed.
I'm Larry (Danna) Collins Jr.
Software developer (C#, SQL, .NET). Live bluegrass musician. Vintage computer collector. I build things that are useful, play things that are loud, and collect things that are old.
Featured tools
6502 Debugger
Write 6502 assembly in the browser and watch it run. Full assembler, step execution, live registers and flags, hex memory inspector. C64 compatible.
Open DebuggerPersonal Kanban
Drag-and-drop cards across To Do, WIP, and Done. Multiple boards, editable columns, and JSON export.
Open BoardDice Roller
Roll d4 through d100 with animated dice, custom modifiers, and a full session history. Built for tabletop RPG sessions.
Roll itRecent posts
All posts →Dice Roller + Sticky Notes Polish
Two updates: a new animated dice rolling tool for tabletop RPG sessions, and a round of polish on Sticky Notes — font-size slider, reset, full screen toggle, and a reassuring one-liner.
New Tool: Personal Kanban Board
Added a drag-and-drop Personal Kanban board with multiple boards, editable columns, and JSON export/import — all in a single vanilla JS file.
Tools
Interactive web demos I use myself. SQL helpers, regex testers, games, and more.
Tips
Pro tips in C#, SQL, JavaScript, and 6502 assembly. Stack Overflow-style, searchable by tag.
Vintage
My Commodore 64 and vintage computer collection. Hardware history, personal notes, growing 6502 projects.
Music
Live bluegrass with friends. AI-assisted songwriting with Suno. Videos and tracks.