The first Palms, the Pilot 1000 and Pilot 5000, had no infrared port, backlight, or flash memory, but did have a serial communications port. Their RAM size was 128 kB and 512 kB respectively, and they used version 1 of Palm OS. Later, it became possible to upgrade the Pilot 1000 or 5000's internals to up to 1 MB of internal RAM. This was done with the purchase of an upgrade module sold by Palm, and the replacement of some internal hardware components. Originally, it was conceived that all Palm PDAs were to be hardware-upgradable to an extent, but ultimately, this capability gave way to external memory slots and firmware-upgradable flash memory after the Palm III series. The next couple of Palms, the PalmPilot Personal and PalmPilot Professional, had backlit screens, but no infrared port or flash memory. Their RAM size was 512 kB and 1024 kB respectively. They used version 2 of the Palm OS. Palm III, and all the following Palms, did not have the word "Pilot" in their name due to the previously mentioned trademark dispute. The Palm III had an IR port, backlight, and flash memory. The latter allowed the user to upgrade Palm OS, or, with some external applications, to store programs or data in flash memory. It ran on two standard AAA batteries. It was able to retain enough energy for 10-15 minutes to prevent data loss during battery replacement. It had 2 megabytes of memory, large at the time, and used Palm OS 3. (Palm also produced an upgrade card for the Pilot series, which made them functionally equivalent to a Palm III.) Meanwhile, with Palm Computing now a subsidiary of 3Com, the founders felt they had insufficient control over the development of the Palm product. As a result, they left 3Com and founded Handspring in June 1998. When they left Palm, Hawkins secured a license for the Palm OS for Handspring, and the company became the first Palm OS licensee. Handspring went on to produce the Handspring Visor, a clone of the Palm handhelds that included a hardware expansion slot (early Palm devices also had a hardware expansion slot, however this was for device upgrade purposes, not peripherals) and used slightly modified software. The next versions of Palm used Palm OS 3.1. These included Palm IIIx with 4 Megabytes
of memory, Palm IIIe without flash memory or hardware expansion slot (and available for lower price), Palm V with 2 Megabytes of memory, and, Palm Vx with 8 Megabytes of memory. Palm VII had wireless connection to some Internet services, but this connection worked only within the United States. It used Palm OS 3.2. Palm IIIc was the first Palm handheld with a color screen. It used Palm OS 3.5 which provided extensive tools for writing color applications. Some of these newer handhelds, for example Palm V, used internal rechargeable batteries. Later this feature became standard for all Palms. Palm handhelds up to 2002 contained Motorola DragonBall processors, part of the Motorola 68000 family. Starting with the Palm Tungsten, the platform transitioned to the ARM architecture with Texas Instruments, Samsung, and Intel as suppliers. As ARM had previously been used in the Apple Newton series, the platform had significant investment in mobile and low-power applications. SOME PALM MODELS: Palm Taxi aka Palm-Pilot, Handspring Visor, PalmPilot Personal and PalmPilot Professional, Z22, Zire 72, Tungsten E2, TX, Treo Pro, Treo 800w, Treo 755p, Treo 750v, Treo 750, Treo 700p, Treo 700w, Treo 700wx, Treo 680, Treo 650, Treo 500, Treo 500v, Palm Centro, Palm Pre, Palm Pixi, Palm Pre Plus, Palm Pixi Plus, Palm Pre 2, HP Veer, HP Pre3, Pilot 1000, Pilot 5000, PalmPilot Personal, Palm III, PalmPilot Professional, Palm IIIx, Palm III, m100, Palm IIIe, Palm IIIx , m105, Palm IIIxe, m125, Palm IIIc, m130, Handspring Visor, Zire 31, Palm V, Palm m500, Palm Vx, m500, Palm VII, VIIx, Palm VIIx, i705, Palm m100, m105, Palm m105, Zire, Palm m125, Palm m130, Zire 71, Palm m500, Tungsten E2, Palm m505, m515, Palm m515, Tungsten E2, Palm i705, Treo 650, Tungsten E, Tungsten E2, Tungsten E2, Tungsten T, Tungsten T2, Tungsten T3, Tungsten T5, TX, Tungsten W, Treo 600, Tungsten C, TX, Zire, Zire 21, Z22, Z-22, Zire 31, Zire 71, Zire 72, Handspring Treo 90, Handspring Treo 180, Treo 270, Handspring Treo 180g, Treo 270, Handspring Treo 270, Treo 600, Han, dspring Treo 300, Treo 600, Treo 650, Treo 700p, Treo 755p, Treo 700w, Treo 700wx, Treo 680, Centro, LifeDrive. Visit Wikipedia to read even more on the Palm OS and PDA's.