Casio W-800h Mod
In the world of watch modding, the Casio W-800H is an unlikely hero. For around $20 USD, you get a 100-meter water-resistant, 10-year battery digital watch. But for a growing community of modders, that’s just the starting point.
The W-800H mod scene exists because the watch solves a simple equation: cheap + tough + huge display = perfect canvas.
Here are the three most popular ways people are modifying the Casio W-800H.
Every time you remove the battery or separate the module from the LCD, you must short the "AC" contact (marked on the circuit board) to the battery positive terminal. If you don't, the screen will be garbled or the buttons won't work.
Absolutely. The Casio W-800H mod occupies a unique valley in watch collecting. On one side, you have luxury watches that you are afraid to scratch. On the other, you have cheap watches you are ashamed to wear.
The modded W-800H destroys both problems.
You get the rugged, go-anywhere reliability of a Casio digital brain, wrapped in a custom chassis that looks like a million bucks but costs less than a dinner for two. The process of modding—of risking the $20 watch to create a $200 look—teaches you more about watchmaking than just buying a Seiko.
Whether you are installing a simple NATO strap or sawing your bezel to fit a sapphire crystal, the Casio W-800H is waiting for you. It is the perfect gateway drug to watch modding.
Next Step: Go to Amazon, buy the base watch. Order a set of small screwdrivers. Join the r/casiomods subreddit. And remember: If you break it, you are only out the price of a pizza. Press the AC button and try again.
The 10-year battery is ticking. Make every second count.
Casio W-800H is a favorite in the modding community because its module contains several factory-disabled features that can be "unlocked" with simple hardware modifications. 1. The Countdown Timer Mod (Essential Hack)
By default, the W-800H lacks a countdown timer (CDT). However, the internal PCB uses the same chip as other models that do have this feature.
: You must open the case and remove a tiny bridge (jumper) on the PCB.
: Most modders use a heated, sharpened screwdriver or a soldering iron with solder wick to disconnect the specific jumper pad.
: Once the bridge is removed, the "Timer" mode becomes accessible in the mode rotation. : Some users report this mod also unlocks an auto-repeat function for the timer, toggled via the light button. 2. Unlocking 5 Multi-Alarms
The stock watch only has one alarm, but the chip supports five.
: Similar to the timer mod, this involves shorting or opening specific "jumper" pads on the PCB.
: While the alarms function, the standard W-800H screen may not have specific icons to indicate which of the five alarms is currently active or being edited. 3. Aesthetic & Physical Mods Negative Display (Reverse LCD)
: You can flip the screen's appearance (light text on a dark background) by removing the original polarizing film and reapplying a new piece rotated 90 degrees.
: Filling the watch case with high-grade silicone oil to eliminate air.
: Dramatically improves underwater legibility and theoretical water resistance.
: Risky; air bubbles can form if not done entirely submerged in oil. Strap Adapters JaysAndKays adapters to convert the proprietary lugs to standard widths, allowing you to use any NATO or leather strap
The most popular modification for the Casio W-800H Go to product viewer dialog for this item.
is unlocking its hidden Countdown Timer feature. This watch uses a universal PCB (Module 3239/3240) shared with other models; Casio disables specific functions on the by bridging "jumpers" on the circuit board with solder. Core Feature: Unlocked Countdown Timer
By removing a specific solder bridge, you can add a fully functional 24-hour countdown timer to the watch's mode cycle.
The Mod: Open the case, access the PCB, and use a soldering iron or copper wick to remove the solder from Jumper 0 (located in a specific corner of the board). casio w-800h mod
Hidden Sub-Feature (Auto-Repeat): Once the timer is unlocked, you can often enable an auto-repeat function. While in timer adjustment mode (numbers blinking), pressing the Light button toggles auto-repeat on or off, though there is no visual indicator on the screen for this. Other Potential Modifications
Beyond the timer, enthusiasts often perform these additional hardware and aesthetic mods:
The Casio W-800H Mod: A Comprehensive Guide to this Popular Digital Watch
The Casio W-800H is a highly sought-after digital watch that has gained a significant following among watch enthusiasts and collectors. One of the key reasons for its popularity is the ability to modify or "mod" the watch to suit individual tastes and preferences. In this article, we will take a closer look at the Casio W-800H mod, exploring its features, benefits, and the various ways in which it can be customized.
Introduction to the Casio W-800H
The Casio W-800H is a digital watch that was first introduced by Casio, a renowned Japanese electronics company, in the 1980s. The watch quickly gained popularity for its sleek design, robust features, and affordable price point. Over the years, the W-800H has undergone several revisions and updates, but its classic design has remained largely unchanged.
What is a Casio W-800H Mod?
A Casio W-800H mod refers to a modified or customized version of the original watch. The modding process typically involves replacing or altering certain components of the watch, such as the case, bezel, dial, or strap, to create a unique and personalized timepiece. Casio W-800H mods can range from simple and subtle changes to more complex and elaborate modifications.
Benefits of Modding a Casio W-800H
There are several benefits to modding a Casio W-800H. For one, it allows watch enthusiasts to create a truly unique and one-of-a-kind timepiece that reflects their individual style and personality. Additionally, modding a W-800H can also be a cost-effective way to breathe new life into an old or worn-out watch, rather than purchasing a brand-new one.
Types of Casio W-800H Mods
There are many different types of Casio W-800H mods, ranging from simple to complex. Some popular mods include:
Popular Casio W-800H Mods
Some popular Casio W-800H mods include:
How to Mod a Casio W-800H
Modding a Casio W-800H requires a combination of technical skills, creativity, and attention to detail. Here are the general steps involved in modding a W-800H:
Conclusion
The Casio W-800H mod is a popular and highly sought-after digital watch modification that allows watch enthusiasts to create a truly unique and personalized timepiece. With its classic design, robust features, and affordability, the W-800H is an ideal candidate for modding. Whether you're a seasoned watch collector or a beginner looking to try your hand at modding, the Casio W-800H mod is definitely worth considering. With its endless possibilities for customization and creativity, the W-800H mod is sure to continue to be a favorite among watch enthusiasts for years to come.
Additional Resources
If you're interested in learning more about Casio W-800H mods or want to try your hand at modding your own watch, here are some additional resources to check out:
By following these resources and guides, you can unlock the full potential of the Casio W-800H mod and create a truly unique and personalized timepiece that reflects your style and personality.
The Casio W-800H is a popular model for modders because its internal module (3240) contains factory-disabled software features that can be unlocked with simple physical modifications. 1. Countdown Timer & 5-Alarm Mod
This is the most common modification. It unlocks a fully functional 24-hour countdown timer and enables 5 separate alarms (up from the single stock alarm).
How it works: The watch's PCB uses "solder jumpers" to set feature sets. By removing a specific jumper, you tell the processor to enable the timer mode. The Procedure: Open the case and remove the module.
Locate the column of solder jumpers on the right side of the PCB. In the world of watch modding, the Casio
Remove the top-right jumper (typically using a soldering iron and wick, or carefully scraping it off).
Reset the module (short the "AC" pad to the battery) to refresh the firmware and display the new "TR" (Timer) mode.
Bonus: Some users report that this mod also enables an auto-repeat function for the timer. 2. Negative Display Mod
You can convert the standard "positive" LCD (dark numbers on light background) to a "negative" LCD (light numbers on dark background) for a stealthier look.
Process: Peel off the original polarizing film from the LCD and replace it with a new sheet rotated 90 degrees.
Pros/Cons: It looks modern and resembles high-end G-Shock models, but it significantly reduces legibility in low-light conditions or when wearing sunglasses. 3. Hydro Modding
This involves filling the entire watch case with high-grade silicone oil or mineral oil.
The Casio W-800H Go to product viewer dialog for this item. is a favorite among modders because of its hidden potential—specifically, a countdown timer feature that is built into the watch's software but disabled by a physical hardware jumper. 1. The "Hidden" Countdown Timer Mod This is the most popular mod for the
. The watch uses a circuit board shared with other models that have the timer enabled.
The Process: You must open the case and remove the module to access the back of the PCB.
The Hack: Locating a specific solder jumper (often labeled on modding guides as the one to remove) and desoldering it using a soldering iron or carefully scraping it away.
Result: Once reassembled and "reset" (by shorting the AC contact to the battery), a new "TMR" (Timer) mode appears in the menu. Some users have even discovered a hidden auto-repeat function within this modded timer. 2. Aesthetic & Functional Mods Beyond unlocking software features, the is a blank canvas for physical customization: Casio W 800h Mod - Etsy
Modified Casio W800H digital watch: "Nightstone" – duotone violet/turquoise backlight gradient, Timer function unlocked. (9) $156. [mod] Casio W800-H Countdown Timer Modification
The most significant "internal" mods involve manipulating the solder jumpers on the watch's PCB to enable features Casio disabled for market segmentation.
Countdown Timer Unlock: The most famous mod. By desoldering or scraping away a specific solder bridge (jumper) on the PCB, you can enable a fully functional 24-hour countdown timer.
Multi-Alarm Expansion: While the stock watch typically has one alarm, shorting or opening specific jumpers can expand this to 5 programmable alarms.
Dual Time Toggle: Jumpers also control the visibility of the Dual Time mode, allowing you to disable it if preferred. 2. Visibility & Aesthetic Modifications
These mods change how the watch looks and performs in various lighting conditions. Casio W 800h Mod - Etsy
The most useful and popular mod for the Casio W-800H unlocking the hidden countdown timer
. By default, the watch only includes a stopwatch, dual time, and alarm. However, because it shares the same internal PCB as other Casio models, you can enable a fully functional 24-hour countdown timer by removing a specific solder jumper. Popular Modifications Countdown Timer Unlock
: The most sought-after hack. It requires opening the watch and removing a small solder jumper on the PCB. Once removed, the timer becomes a selectable mode. 5-Alarm Mod : Modifying jumpers can also unlock up to 5 independent alarms , whereas the stock version only utilizes a few.
: Filling the watch case with silicone oil. This significantly improves legibility
and viewing angles from extreme positions while technically increasing water resistance. Aesthetic Changes : Users often swap the stock resin strap for Nato straps G-Shock-style bumper bars to enhance the watch's rugged look. Quick Summary of Mods
The Casio W-800H: A Retro Revival with a Modern Twist
The Casio W-800H is a modern reincarnation of the classic Casio F-91W, a watch that has become synonymous with minimalist design and rugged reliability. First released in the late 1980s, the F-91W was a staple of 90s fashion, adorning the wrists of hip-hop legends, tech enthusiasts, and anyone who appreciated a no-frills time-telling device. Fast-forward to the present, and Casio has brought back this iconic design with the W-800H, updating it with modern features while retaining its retro charm. Popular Casio W-800H Mods Some popular Casio W-800H
Design and Features
The Casio W-800H retains the same compact and lightweight design as its predecessor, measuring in at just 36.5mm wide and 9.5mm thick. The watch features a durable resin case with a stainless steel back, ensuring it can withstand the rigors of daily wear. The W-800H also boasts a classic digital display with a date and day of the week function, making it easy to stay on top of your schedule.
Key Features:
The MODding Community
The Casio W-800H has quickly become a favorite among watch enthusiasts and MODders, who appreciate its simplicity and versatility. The MODding community has been instrumental in keeping the spirit of the F-91W alive, with enthusiasts creating custom designs, swapping out straps, and even modifying the watch's internals to create one-of-a-kind timepieces.
Why MOD the Casio W-800H?
So, why has the Casio W-800H become a darling of the MODding community? Here are just a few reasons:
Getting Started with W-800H MODding
If you're interested in trying your hand at W-800H MODding, here are a few tips to get you started:
Conclusion
The Casio W-800H is more than just a retro-style watch – it's a blank canvas waiting for your creative input. Whether you're a seasoned MODder or just looking for a fun and affordable project, the W-800H offers endless possibilities for customization and self-expression. With its durable design, feature-rich functionality, and thriving MODding community, the Casio W-800H is an excellent choice for anyone looking to create a unique and personalized timepiece.
Resources
Share Your W-800H MODs!
Show off your W-800H MODs in the comments below! Share your before-and-after photos, and tell us about your MODding process. Whether you're a seasoned pro or just starting out, we'd love to see your creations!
Casio W-800H Go to product viewer dialog for this item. is widely regarded as one of the most versatile "blank canvases" in the watch-modding community. Its combination of a large, clear display and a module shared with more expensive models makes it a prime candidate for unlocking hidden features and visual overhauls. Unlocking the Hidden Countdown Timer The most popular electronic modification for the involves activating its factory-disabled countdown timer. The Hardware Hack: The
uses module 3240, which shares a PCB with models that include more features. By removing a specific solder jumper on the circuit board, you can enable a 24-hour countdown timer. The Process: Open the case back and remove the module.
Locate the specific solder bridge (jumper) on the back of the PCB.
Use a soldering iron and copper wick to desolder and remove the lead bridge. Short the "AC" contact to the battery to reset the module.
Bonus Feature: Some users have discovered that pressing the Light button while in the timer setting mode toggles an "auto-repeat" function, though there is no visual indicator on the screen for this. Visual and Display Modifications Beyond feature unlocks, the
is frequently customized to improve legibility or aesthetics. YouTube·Greg Anderson - The Good Timekeeper
In the world of horology, there is a subset of watches known as "beaters"—watches that are inexpensive, durable, and reliable enough to take a beating without worrying about scratches or damage. For years, the Casio F-91W held the crown as the ultimate beater. However, a new challenger has risen in the modding community: the Casio W-800H.
While it looks like a standard digital watch, the W-800H has become a favorite canvas for modders due to its unique feature set—specifically its superior water resistance compared to the F-91W. This article explores the world of W-800H modifications, from simple strap swaps to complex "case swaps" that turn a $15 watch into a tactical tool.
Difficulty: 1/10 | Cost: $10 - $30 The stock resin strap of the W-800H is stiff and dust-magnetic. Fortunately, the lug width is 18mm (though the gap is tight).
Would you like step-by-step instructions for a specific mod (e.g., crystal replacement or backlight swap)?