1UP HARLOCK123

Insert coin · Player 1 ready

Lonnie Allen WatsonTechnological fossil

Software architect, at the keyboard since grade school in the late '70s. These days I rebuild the arcade and RPG classics I grew up on in C# and Avalonia, so they run natively on Windows, macOS and Linux, Intel or ARM.

  • 63games
  • 8platforms each
  • 13tools & controls
  • 7NuGet packages
  • 1977oldest original

Select your game

Each one is a single self-contained program: download, unpack, run. No installer and no .NET needed.

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63 games

On Linux some games need aplay for sound, or SDL2 for gamepads on ARM. Each game's README says which.

The workbench

Editors, controls and utilities, also cross-platform with Avalonia.

AVAQueryBuilder
AVAQueryBuilder screenshot

AVAQueryBuilder

Application · C# · Avalonia · .NET 9 · SQL Server

Graphical query builder for Microsoft SQL Server.

  • Builds SELECT queries as a diagram of tables, joins and filters
  • 25+ derived fields, GROUP BY with HAVING, sorting, TOP and DISTINCT
  • Finds SQL Servers on the network, runs the query and shows the rows
ControllerExplorer
ControllerExplorer screenshot

ControllerExplorer

Application · C# · Avalonia · .NET 9 · HID

Shows the raw bytes a USB or Bluetooth game controller sends, live, for writing code that reads it.

  • Lists every connected USB and Bluetooth controller by VID:PID
  • Each byte live in hex and binary, lit up the moment it changes
  • Xbox-style pads read through XInput on Windows, HID everywhere else
Vector Match Engine

Vector Match Engine

Application · C# · Avalonia · .NET 8 · ML.NET · SQL Server

Finds the same person or company across two Excel sheets with no shared key and the names spelled differently.

  • Each row becomes a 512-dimension vector of character trigrams, so typos stay close
  • Every record in A scored against every one in B, above a threshold you set
  • Matched pairs side by side, exported to a formatted Excel workbook
ProjectJA

ProjectJA

Web application · C# · Blazor · .NET 10 · PostgreSQL

A lightweight Jira-style issue tracker, in the making, to run as SaaS or on your own server.

  • A drag-and-drop kanban board that updates live in every open browser
  • A database per tenant for SaaS, or one Docker stack on-prem
  • Full-text search, invites, single sign-on (OIDC) and an audit log
AVASdCanvas
AVASdCanvas screenshot

AVASdCanvas

Control · C# · Avalonia · .NET 9
On NuGet · v1.0.1 · 188 downloads

Structured drawing canvas that code can populate and users can interact with.

  • Graph-paper canvas of entities joined by arrowed connectors
  • Snap to grid, automatic placement, and dragging with live connectors
  • Click, double-click, right-click and hover events carry your metadata
AvaloniaDiagramerControl
AvaloniaDiagramerControl screenshot

AvaloniaDiagramerControl

Control · C# · Avalonia
On NuGet · v1.0.0 · 190 downloads

The VB.Net-era LineChart control, rebuilt for Windows, macOS and Linux.

  • Up to ten data series, with polynomial trend lines
  • Animated flashing to pick one series out of the rest
  • Grid, knot markers and banded backgrounds; every colour and font styleable
Avalonia3DCanvas
Avalonia3DCanvas screenshot

Avalonia3DCanvas

Control · C# · Avalonia · .NET 9
On NuGet · v1.0.0 · 226 downloads

3D object viewer for Avalonia and .NET 9.

  • Loads .3DS, .OBJ, .STL, .PLY and .FBX models
  • Wireframe drawing, centred and scaled to fit automatically
  • Smooth rotation on all three axes, at any speed
AvaloniaTimeLineControl
AvaloniaTimeLineControl screenshot

AvaloniaTimeLineControl

Control · C# · Avalonia
On NuGet · v1.0.1 · 329 downloads

Timeline control for Avalonia applications.

  • Up to ten timeline rows side by side
  • 30 chicklet styles: ten colours, each a box, a circle or a triangle
  • Wheel and keyboard scrolling, weekends, month labels and overlap markers
SyntaxColorizer
SyntaxColorizer screenshot

SyntaxColorizer

Control · C# · Avalonia · .NET 8 · NuGet
On NuGet · v1.0.2 · 524 downloads

Syntax-highlighting text box for Avalonia, with no dependencies beyond Avalonia itself.

  • Highlights 38 languages as you type, from C# and Rust to T-SQL and Mermaid
  • 14 built-in colour themes, and line numbers you can switch off
  • Linting with your own rules, and an MVVM-friendly design

On NuGet

Avalonia controls, ready to add to a project of your own: 7 packages, 2,080 downloads so far.

NuGet · v1.0.2 · .NET 8

SyntaxColorizer

A syntax highlighting TextBox control for Avalonia with support for 37 programming languages and 14 built-in color themes. Features real-time highlighting, line numbers, and linting infrastructure.

dotnet add package SyntaxColorizer
NuGet · v1.0.2 · .NET 9

LAWgrid

A highly customizable data grid control for Avalonia UI with built-in support for multiple databases including SQL Server, Oracle, MySQL, PostgreSQL, MongoDB, and DB2.

dotnet add package LAWgrid
NuGet · v1.0.1 · .NET 8

AvaloniaTimeLineControl

A powerful timeline visualization control for Avalonia applications.

dotnet add package AvaloniaTimeLineControl
NuGet · v1.0.0 · .NET 9

Avalonia3DCanvas

LWO) with automatic rotation and canvas resizing. Features wireframe rendering, customizable line colors and thickness, and smooth animation.

dotnet add package Avalonia3DCanvas
NuGet · v1.0.0 · .NET 9

AvaloniaDiagramerControl

A powerful, customizable multi-series line chart control for Avalonia UI applications.

dotnet add package AvaloniaDiagramerControl
NuGet · v1.0.1 · .NET 9

AVASdCanvas

An Avalonia canvas control for rendering structured diagrams with colorized labeled entities, connectors with configurable endpoints, a graph-paper grid background, drag-and-drop, hit testing, and arbitrary…

dotnet add package AVASdCanvas
NuGet · v0.1.1 · .NET 9

LawTreeView

An Avalonia tree-view control with drag-drop reordering, icons, selection, keyboard navigation, hover/selection styling, and a context menu.

dotnet add package LawTreeView

Day job

Healthcare records, reporting and code generation: the systems that pay for the arcade.

Behavioral health EHR · private repo

CARES

Electronic health records with reporting, records management and a web portal.

Query builder · private repo

Cares Query Reporter

Point-and-click database queries, with client-specific builds.

Data-access framework

CODE Complete

A database abstraction tool that grew into a full data-access code generator.

REST service

Code Generation API

CODE Complete's generation as a RESTful API for enterprise deployment.

Hall of fame

The originals, oldest first, and what each became here.

High scores

RankYearOriginalRebuilt as
1st1977Space WarsAVASpaceWars
2nd1978Space InvadersAVAInvaders
3rd1979AsteroidsAvaRoids
4th1979Lunar LanderAVALander
5th1979TailgunnerAVAGunner
6th1980BattlezoneAVAZone
7th1980BerzerkAVABerzerk
8th1980CentipedeAVACentipede
9th1980Missile CommandAVAMissile
10th1980Pac-ManAVAPacMan
11th1980Star CastleAVACastle
12th1981DefenderAVADefend
13th1981Donkey KongAVAKong
14th1981FroggerAVAFrogger
15th1981GalagaAVAGalaga
16th1981Omega RaceAVARace
17th1981QixAVAQix
18th1981ScrambleAVAScramble
19th1981TempestAVATempest
20th1981WizardryAVAWizardry
21st1982BurgerTimeAVABurgerT
22nd1982Dig DugAVADigDug
23rd1982GravitarAVAGravitar
24th1982JoustAVAJoust
25th1982Moon PatrolAVAMoonPatrol
26th1982Pole PositionAVAPolePosition
27th1982Q*bertAVAQ-Bert
28th1982Robotron: 2084AVATron
29th1982TelengardAVAGard
30th1982Time PilotAVATimePilot
31st1982TronAVALightCycle
32nd1982XeviousAVAXevious
33rd1982ZaxxonAVAZaxxon
34th1983Archon: The Light and the DarkAVAArchon
35th1983Elevator ActionAVAElevatorAction
36th1983Lode RunnerAVALodeRunner
37th1983M.U.L.E.AVAMule
38th1983SinistarAVASinstar
39th1983Spy HunterAVASPYHunter
40th1983Star Trek: Strategic Operations SimulatorAVATrek
41st1983Star WarsAVAWars
42nd1983TapperAVATapper
43rd1983Ultima III: ExodusAVAUltima3
44th19841942AVA1942
45th1984EliteAVAElite
46th1984Marble MadnessAVAMarble
47th1984Seven Cities of GoldAVACitiesOfGold
48th1985GauntletAVAGauntlet
49th1985PaperboyAVAPaperboy
50th1985The Bard's TaleAVABardsTale
51st1985Ultima IV: Quest of the AvatarAVAUltima4
52nd1986ArkanoidAVAArkanoid
53rd1986Bubble BobbleAVABubble
54th1986Party RPG classicAVAMMB1
55th1986RampageAVARampage
56th1986StarflightAVAFlight
57th1987Dungeon MasterAVADungeonMaster
58th1987Sid Meier's Pirates!AVAPirates
59th1988Pool of RadianceAVARadiance
60th1990AngbandAVABand
61st1991Sid Meier's CivilizationAVACiv
62nd1993Master of OrionAVAOrion
63rd2002Dungeon SiegeAVADungeonSeige

Player profile

I'm now an old architect in a small piece of a very large company that bought us about twelve years ago. I've been into computers since grade school in the late '70s, and I still like building things end to end.

At work I'm focused on modernization. At home it's local LLMs, single-board computers, and recreating the games that got me hooked, built from their documented behavior and released for every platform I can reach.

Lonnie Allen Watson
Class
Architect
Since
Late 1970s
Weapons
C#, .NET, Avalonia
GitHub
Harlock123
LinkedIn
lonnie-watson