Welcome

Welcome to my homepage, I'm Óscar Toledo G., and here you'll find my winning entries from contests like the IOCCC, the JS1K and the MSXdev, information about my games for retro consoles, my store of e-books, and also the world's smallest chess programs written by me in C, Java, Javascript and x86/6502 machine code.

If you're looking for information about the Mexican scientist Oscar Toledo Esteva, then please go to the History page of the Familia Toledo organization site.

Update (Mar/12/2025)

Ray traced robot made in transputer using my C compiler

Final article of the three-article series about my early years, my full transputer operating system with K&R C compiler. The complete history about how I evolved my operating system to support multiple drives, subdirectories, CD-ROM, along its utilities, plus expanding the compiler. Enjoy it!

Update (Feb/24/2025)

New in my series of articles about my early years, bootstrapping Small-C for transputer and coding an operating system from zero. The history about how I ported the Small-C compiler to transputer, and I had an idea that changed completely my objective.

Update (Feb/04/2025)

New in my series of articles about my early years, my Pascal compiler for transputer.
Routines for pixel drawing, line drawing, and circles for CVBasic.
16 years of this site!

Update (Jan/13/2025)

Unlucky Pony my 2021 game for Intellivision is now freely available in ROM format.
Manhole for Colecovision, is a new game by Eric Damain written in CVBasic.
My CVBasic compiler now has VDP.STATUS and the statements SELECT CASE/END SELECT. I also updated IntyBASIC with these statements plus bank switching support.
The 2nd MSX Mexico Meeting was covered by local TV Channel 34 in a brief capsule, plus a radio program about where I talk about MSX games.
La Cueva Retro recorded my talk about the japanese MSX computers in 2023 (Spanish).

Update (Nov/02/2024)

Pumpkin Bakery is my new Halloween game for Intellivision. You are Pumpkin Smith, the proud owner of a pumpkin pie bakery, and your best customers are... skeletons.
CVBasic v0.7.1 now supports the NABU PC, making it to twelve platforms supported!
Castlevania for Colecovision demo is being developed by Matthew Kiehl using CVBasic.
I've developed a Sound Effect editor for SN76489 and AY-3-8910 in CVBasic, so now you can develop sound effects for all twelve supported platforms.
My assembler gasm80 now supports the undocumented Z80 and 6502 instructions.
I gave a talk about programming games for MSX at the Amerike University on Oct/14/2024, and later on Oct/26/2024 at the MSX Retrocomputing Meet Mexico 2024 at the Torre Axa. The game being developed was Brinquitos.
Akalabeth for Intellivision was available at the PRGE 2024 published by Atariage. Forty copies were sold in less than an hour. It will be available at the Atariage store soon.

Update (Sep/07/2024)

Akalabeth for Intellivision by yours truly will be published by Atariage. It has the rare distinction of being the the first Intellivision game published by Atariage.
CVBasic v0.7.0 adds official support for Tatung Einstein, Casio PV-2000, Hanimex/Soundic Pencil II, and TI-99/4A! The TMS9900 support is courtesy of Mike Brent (tursi).
I've ported GORILLA.BAS to Colecovision using CVBasic, you can download the complete source code. Later I made an archive containing GORILLA.BAS compiled for eleven platforms!

Update (Aug/07/2024)

I've implemented support for Sord M5 and Memotech MTX computers in my CVBasic compiler v0.6.0, but wait, I went the last mile and implemented a full 6502 backend and library to support the Vtech Creativision and Dick Smith's Wizzard consoles!
From Japan, MAXXKAO bought my game Aardvark from the Atariage Store and writes about his experience.
I've scanned the Mexican manual for Lock'n'Chase for Intellivision.

Update (Jul/09/2024)

I've released the source code of CVBasic: my BASIC cross-compiler for Colecovision, MSX and Sega SG-1000. Now it also supports Spectravideo SVI-318/328!!!
Brian's Man Cave does a review of my book Programming Games for Colecovision.
I've made a video of my book Programming Games for Colecovision.

Update (May/15/2024)

Now available my new book Programming Games for Colecovision in hardcover from lulu.com, and also as ebook from my digital store!

Update (May/11/2024)

Now available my new book Programming Games for Colecovision in paperback from lulu.com.

Update (Apr/14/2024)

My new program is a Ray Tracer in 483 bytes of x86 machine code and, of course, runs from a boot sector! Inspired by an awesome program by D. Scott Williamson for Atari 8-bit BASIC.

Update (Mar/19/2024)

bootLogo is a Logo language written in 509 bytes of x86 machine code and runs from a boot sector! Inspired by my own LOCS.

Update (Mar/12/2024)

LOCS, my Logo-like language written at age 9 in 1988. I've found it in old papers.

Update (Mar/10/2024)

I've found a page of an even earlier printout of Viboritas when it wasn't called Viboritas.

Update (Mar/08/2024)

CVBasic v0.3.0 now available! Including SCREEN, MODE, BORDER, DEFINE VRAM, and more optimization. Now included the TMSColor utility for image conversion!

Update (Mar/05/2024)

CVBasic v0.2.0 now available! Including CONST, ON GOTO/GOSUB, INCLUDE, PLAY/MUSIC, and more optimization. Sega SG1000 support as extra!

Update (Mar/01/2024)

I've developed CVBasic, a BASIC language compiler for Colecovision consoles. The version 0.1.0 is now available for download!

Update (Feb/19/2024)

I wrote an article about my game Cubos developed in 1991 in 3K of Z80 machine code when I was age 12. I needed new code to solve its main bug.
Fifteen anniversary of going online with this website!

Update (Feb/06/2024)

I wrote an article about my game Viboritas developed in 1990 in 2K of Z80 machine code when I was age 11. I even found a 34-year-old bug.
The 240p Test Suite now includes MDFourier tests.

Update (Jan/25/2024)

I wrote an article about the translation of Mecha-9 to Japanese.
Copies of Thunder Soldier and Mr. Chess for Intellivision are now available at the Blue Sky Rangers store in eBay.
The 240p Test Suite now can use MSX2 and has a database of MSX BIOS, also MDFourier is in the works.

Update (Jan/10/2024)

I ported the Artemio Urbina's 240p Test Suite to Colecovision, MSX 1, and Sega SG1000. The full source code and binaries are released under GPLv2. https://github.com/nanochess/240pTestSuite_colecovision
I was present as exhibitor at the Retro Game Fest 2 celebrated Dec/16/2023 at the Marriot Courtyard Hotel.
I'm the 9th position assembler developer in Github over 98974 developers.
My book Programming Games for Atari 2600 reached again the 4th position in Amazon for Assembly Language.

Update (Dec/02/2023)

Uploaded the scans for the Mexican manual of Auto Racing for Intellivision.
Copies of Thunder Soldier for Intellivision are now available from Good Deal Games.
Copies of Mr. Chess for Intellivision are now available at eBay.
Happy Holidays! :)

Update (Nov/05/2023)

My new Halloween game for Intellivision is Pumpkin Castle. Guide your friendly pumpkin to avoid obstacles in the castle and rescue your lovely girlfriend. Download available at Atariage.
I gave a talk during the MSX Meet Mexico at the Masayoshi Ohira park in Mexico City.
I gave a talk during the Gamedev Xperience 2023 at the Engineering Faculty of the UNAM.
Now it is available The Sydney Hunter collection cartridge for Evercade. It includes my game Sydney Hunter and the Sacred Tribe.
The first few copies of Pumpkin Trilogy for Intellivision from Elektronite have been sold at the PRGE 2023.

Update (Sep/30/2023)

New games Castle of Death, Frankenstein's Monster, and Unlucky Pony's Adventures for Intellivision added to the store.
People visiting the Atariage booth at the PRGE 2023 will be able to play Akalabeth for Intellivision.
I've released the source code for TTRIS, the first Tetris game made for the TRS-80 model 1.

Update (Sep/12/2023)

Thunder Soldier is my new game for Intellivision consoles, including parallax scrolling!
I've developed TTRIS, is the first Tetris game made for the TRS-80 Model 1, a Z80-based computer with monochrome 64x16 screen and 8K of RAM.
Papa Pete plays Grail of the Gods for Intellivision.

Update (Jun/21/2023)

I've disassembled and commented Video Chess (Atari 2600). A first time!
Nice review of Princess Quest by the Video Game Critic.
My Colecovision on a breadboard was mentioned by hackster.io.

Update (May/22/2023)

I've wrote a small article about the development of Mr. Chess for Intellivision.
Review of Programming Games for Atari 2600
If you are an Iircade owner now you can get Mecha-9 at the Iircade Store.

Update (Apr/12/2023)

Hackaday mentions my Colecovision console on a breadboard!
Tower Attack for Intellivision is my new Fools' Day joke.
My new Cardano NFT Aliensweeper is now available. The token contains the complete game including sound effects! A homage to the classic Minesweeper.

Update (Mar/08/2023)

I built a Colecovision on a breadboard, complete with cartridge and joystick port!
My new game for Intellivision is Mr. Chess! It is based on Toledo Atomchess adapted to the Intellivision processor and heavily optimized.
I contributed a chess program as an example for the Maxime Chevalier's Minimalistic Virtual Machine.
If you are an Iircade owner now you can buy Princess Quest and Mecha-8 from the Iircade Store, and soon Mecha-9.

Update (Feb/07/2023)

My book Programming Games for Atari 2600 is now available at Amazon as paperback or hard cover. Also, I've made an old-style advertisement for it.
Feel free to visit my all-new Tiktok Channel @nanochess
I appreciate all the success histories shared by my readers. It means a lot to me! Thanks! 🙏
ChatGPT knows about me!
Added Sharp Shot and Tennis to the scanned Intellivision Mexican manuals.

See previous updates

Site created: Feb/19/2009. Last modified: Mar/12/2025