pda

13 Articles

Emulating The Battery Controller In An Ancient Acer PDA

December 16, 2024 by 8 Comments

[Mark B] had a problem. He’d come into possession of an Acer N30 PDA, sans batteries. He couldn’t just throw any old cells in, since the unit expected to communicate with an onboard controller chip in the original pack. What ensued was his effort to emulate the original battery controller hardware. This is classic Hackaday right here, folks.

Just wiring in typical Li-Ion voltages to the PDAs battery pins wasn’t enough to make this Windows CE device happy. The device kept fleeing to sleep mode, thinking the battery was faulty or very low. Eventually, inspecting the motherboard revealed the PDA hosted a BQ24025 charger IC from Texas Instruments. [Mark] surmised it was trying to communciate with a BQ26500 “gas gauge” IC from the original battery pack. Armed with that knowledge, he then set about programming an STM32 chip to emulate its behavior. He then successfully ported the functionality over to a CH32V003 microcontroller as well. Paired with a Nokia BL-5CT battery, he had a working portable power solution for his PDA.

It’s great to see ancient hardware brought back to functionality with some good old fashioned hacking. I’d hoped to do the same with my Apple Newton before someone nicked it from my lounge room, more’s the pity. If you’re rescuing your own beleaguered battery-powered portables, don’t hesitate to let us know!

The UMPC powered up, case-less showing the black PCB, with the display standing upwards and showing a blue colour scheme desktop with a CLI terminal open. To the right of it is one of the UMPCs that served as an inspiration for this project.

Bringing The UMPCs Back With A Pi Zero

August 3, 2024 by 12 Comments

Miss PDAs and UMPCs? You wouldn’t be the only one, and it’s a joy to see someone take the future into their own hands. [Icepat]’s dream is reviving UMPCs as a concept, and he’s bringing forth a pretty convincing hardware-backed argument in form of the Pocket Z project. For the hardware design, he’s hired two engineers, [Adam Nowak] and [Marcin Turek], and the 7-inch Pocket Z7 version is coming up quite nicely!

The Hackaday.io project shows an impressive gallery of inspiration devices front and center, and with these in mind, the first version of the 7-inch UMPC sets the bar high. With a 1024×600 parallel RGB (DPI) touchscreen display, an ATMega32U4-controlled keyboard, battery-ready power circuitry, and a socketed Pi Zero for brains, this device shows a promising future for the project, and we can’t wait to see how it progresses.

While it’s not a finished project just yet, this effort brings enough inspiration all around, from past device highlights to technical choices, and it’s worth visiting it just for the sentiment alone. Looking at our own posts, UMPCs are indeed resurfacing, after a decade-long hiatus – here’s a Sidekick-like UMPC with a Raspberry Pi, that even got an impressive upgrade a year later! As for PDAs, the Sharp memory LCD and Blackberry keyboard combination has birthed a good few projects recently, and, who can forget about the last decade’s introductions to the scene.

PumpkinOS

PumpkinOS: A Modern Reimplementation Of PalmOS For Today’s Platforms

April 8, 2024 by 26 Comments

In a world where the personal digital assistant (PDA) has become yet another retro computing system, it’s always nice when experiencing the software for such platforms can be done in a way that does not involve hunting down original hardware of questionable functionality. Here PumpkinOS is a PalmOS-compatible project by [migueletto] which runs as a regular application on modern systems and allows for  original PalmOS applications for the Motorola 68k to run on x86 and ARM host systems.

On start-up the Launcher shows up first, just like with PalmOS, from which the four standard PalmOS applications (AddressBook, MemoPad, ToDoList and DateBook) can be launched. Due to endianness issues (m68k being Big Endian), files created by these applications cannot be shared between PumpkinOS and PalmOS, and as noted on the GitHub page, it’s still a far from finished project. That said, it appears to be able to run quite a few original PalmOS applications from sites like PalmDB, and compatibility should get better over time.

The author maintains a development blog as well, for those who are interested in the more in-depth details of this project.

Wiring An SD Card To A Handspring PDA’s 68K Bus With Only Three SOT23s

January 13, 2024 by 13 Comments

In 1998 the founders of Palm had a bit of a falling out with the wildly successful PDA company’s new owners. They set up a new company called Handspring, which enabled them to make PDAs again in the way they preferred, This resulted in the Handspring Visor line of PDAs, which featured a big cartridge slot called the Springboard Expansion slot. Much like a Gameboy, you could put in a range of modules, ranging from games to cameras to memory expansion and more. Since these modules connect directly to the internal Motorola 68k-based microprocessor, you could make a module either to comply with this standard or if you’re like [Dmitry], you’d figure out a way to get an SPI device like an SD card to communicate and expand storage.

Editor note: Dmitry’s design isn’t the first SD/MMC interface for the Visor. Portable Innovation Technology’s SD MemPlug Module supported SD/MMC way back in 2002. However – MemPlug was a commercial product, while Dmitry’s work is open source.

Continue reading “Wiring An SD Card To A Handspring PDA’s 68K Bus With Only Three SOT23s” →

Pocket Computer Reminds Us Of PDAs

June 23, 2022 by 9 Comments

Before smartphones exploded on the scene in the late 00s, there was still a reasonable demand for pocket-sized computers that could do relatively simple computing tasks. Palm Pilots and other PDAs (Personal Digital Assistants) were all the rage in the ’90s and early ’00s, although for cutting-edge tech from that era plenty of these devices had astronomical price tags. This Arduino-based PDA hearkens back to that era, albeit with a much more accessible parts list.

The build is based around an Arudino Nano with an OLED screen and has the five necessary functions for a PDA: calculator, stopwatch, games, phonebook, and a calendar. With all of these components on such a small microcontroller, memory quickly became an issue when using the default libraries. [Danko] uses his own custom libraries in order to make the best use of memory which are all available on the project’s GitHub page. The build also includes a custom PCB to keep the entire pocket computer pocket-sized.

There are some other features packed into this tiny build as well, like the breakout game that can be played with a potentiometer. It’s an impressive build that makes as much use of the microcontroller’s capabilities as is possible, and if you enjoy projects where a microcontroller is used as if it is a PC take a look at this Arduino build with its own command-line interface.

Continue reading “Pocket Computer Reminds Us Of PDAs” →

Rex Wasn’t Really A PDA, It Was The First Great Digital Rolodex

March 11, 2021 by 30 Comments

Back in the 1990s I was fascinated with small computers. I used the HP200LX palmtop computer for almost ten years, which I wrote about back in December. Naturally, the Franklin Rex 3 PCMCIA-sized organizer caught my attention when it was released in 1997. Here was a Personal Digital Assistant (PDA) the size of a credit card that could fit not just in your pocket, but in your shirt pocket.

Viewed today, it was an interesting paradigm. The screen takes up almost the entire front face of the device with a few buttons for navigation. But isn’t it a deal-breaker that you can’t enter or edit contact info on the device itself? This was long before cellphones were pervasive, and if you had the option to connect to the internet a telephone or Ethernet cable was involved. The ability to have a large data set in your pocket viewable without slapping a brick-like laptop on a table was pretty huge.

I think the killer feature was the PCMCIA interface. I challenged myself to reverse engineer the API so that I could sync data outside of the

Continue reading “Rex Wasn’t Really A PDA, It Was The First Great Digital Rolodex” →

This Home-Made PDA Is A Work Of Art

January 24, 2018 by 39 Comments

There was a time, back in the 1990s, when a PDA, or Personal Digital Assistant, was the height of mobile computing sophistication. These little hand-held touch-screen devices had no Internet connection, but had preloaded software to manage such things as your calendar and your contacts. [Brtnst] was introduced to PDAs through a Palm IIIc and fell in love with the idea, but became disillusioned with the Palm for its closed nature and lack of available software a couple of decades later.

His solution might have been to follow the herd and use a smartphone, but he went instead for the unconventional and produced his own PDA. And after a few prototypes, he’s come up with rather a well-executed take on the ’90s object of desire. Taking an ARM microcontroller board and a commodity resistive touchscreen, he’s clad them in a 3D-printed PDA case and produced his own software stack. He’s not prepared to release it just yet as he’s ashamed of some of its internal messiness, but lets hope that changes with time.

What this project shows is how it is now so much easier to make near commercial quality one-off projects from scratch. Accessible 3D printing has become so commonplace as to be mundane in our community, but it’s worth remembering just how much of a game-changer it has been.

To see the device in action, take a look at the video below the break.

Continue reading “This Home-Made PDA Is A Work Of Art” →