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Palm OS Management

Extracts from this document...

Introduction

Palm OS Palm OS - Table of Contents Topic Page I. Introduction...........................................................................2 II. Aim of Palm OS.......................................................................3 * Flexibility...........................................................................3 * Ease of Uses........................................................................3 * Mobility.............................................................................4 III. Power Management..................................................................4 IV. Data and File Management.........................................................5 V. Memory.................................................................................5 * Overview...........................................................................5 * Architecture.......................................................................6 * Format..............................................................................7 * Allocation..........................................................................7 VI. Process Management................................................................8 VII. Security.................................................................................9 VIII. Conclusion.............................................................................9 INTRODUCTION The Palm OS was developed by Palm, Inc. in 1996 under Jeff Hawkins, inventor of the Palm Pilot and Treo. The OS was developed primarily as a proprietary and embedded operating system for mobile devices that utilized basic applications for personal information management (PIM). Theses devices range from smart phones, watches, barcode readers and GPS devices. It is the most popular operating system that runs on Personal Digital Assistants. The Palm OS also called Garnet OS operate on either Motorola/Freescale DragonBall or ARM architecture- based processors. Some of the features of the OS include a handwriting recognition system called Graffiti, synchronization with desktop computers called HotSync, TCP/IP network access, Serial port/USB, Bluetooth, Infrared and Wi-Fi connections, device password protection, basic PIM applications and a simple graphic user interface. Palm OS offers a variety of ways for the user to interact with it, with a user interface that fits most users needs allowing for ease of use and convenience. For example, the applications limit the amount of data that needs to be entered by the user since it is more difficult to enter data through the graffiti, graffiti 2, and the keyboard dialog on the PDA. Menu's are hidden to allow more room on the screen, and toolbars are only included for the essential commands since they are so small and hard to tell apart on the screen. ...read more.

Middle

(Palm vs Windows CE, 2003) Memory Management Overview Memory for the palm OS comes in the form of a removable card. The card can contain both ROM and RAM. The Palm OS is capable of supporting up to 256 different memory cards at one time, but to date all Palm products only support a single card. ROM is actually implemented as Flash memory and is somewhat editable as a result. The memory card's ROM size varies anywhere from 512K to 2MB. ROM is non-volatile, and as a result is where critical information is stored including the operating system and standard applications. All remaining data is stored in RAM, including run-time data, user data, user settings, and third-party applications. RAM is volatile, meaning that this data will be lost if power to the unit is lost. There is a capacitor that allows data to be retained for up to a minute in the absence of a power supply, but after that all data is erased. This means that users need to be sure to keep their batteries charged and frequently back up their data on a more reliable media. (Albanowski, 2003) Architecture Each memory card is partitioned into "Heaps." A heap is essentially a section of memory. There are 4 memory heaps in the Palm OS: a ROM heap, a storage heap, a dynamic heap, and a low memory globals heap. For the purposes of memory management, we will be focusing on the storage and dynamic heaps. Each heap is then subdivided into several smaller sections. Each heap includes: a header, a master pointer table, chunks, and a terminator. The header contains information about the size of the heap and the heap ID. ...read more.

Conclusion

This is actually an event and not a termination signal. The process returns to memory, returns all resources to the system and the processor is returned to the OS. The system then returns to doze mode or begins the next process on selected by the user. (A Palm OS Management Share System) Security The Palm OS provides various methods that help keep the users data safe. The first is the use of a password protection scheme much like what is seen in other operating system. The user has to enter their password to be able to log onto the system or use certain features. Data contained in the Palm OS is encrypted. This helps to assure that if data does get intercepted, it is useless without the proper decryption algorithms. The Palm OS also supports PPTP and VPN secure wireless networking protocols to ensure the safety of wireless transmissions. Finally, since data is easily backed up to a PC, there is no great risk of the loss of critical information if properly synced. Conclusion Since the beginning of the Palm OS, it has set the trend for most mobile communication. Today the Palm OS runs on two out of every three PDA's and accounts for eighty five percent of what businesses include on their handheld standard's list. "PalmSource has driven innovation and maintained a strong focus on providing customers with exactly the right solution to fit their needs". (PalmSource) A close competitor for Palm OS is Windows CE. Windows CE is a small version of the windows operating system for use with portable devices. Each has their own advantages and disadvantages and as of now it is debated as to which OS is better to use. Palm OS has and most likely will continue to redefine market expectations and lead the world in mobile platforms. ...read more.

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