Dr. Reddy's Guide to HP Palmtops

Palmtop Storage, Modems, and Other Add-On Hardware

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An HP 200 LX HP's Palmtop Home Page

See the Where to Buy page for some information on where to find these accessories.

PCMCIA Memory Cards

I use flash cards (MobileMax, SanDisk), and a lot of them. My 200 used to have a 10 MB SanDisk aboard, but I am now using a Compact Flash-to-PCMCIA adapter and have successfully used cards up to 256 MB; right now I have a 32 MB card in the machine, which is more than enough for all the software I keep around. I also have several smaller PCMCIA flash cards (2-20 MB), and I still have several of HP's old 128 KB SRAM cards; there's not much capacity, but they're occasionally useful for quick backups away from home or work.

I have found one small problem with the very-high-capacity CF cards (64 MB and up). I'm not sure why, but it takes Filer a few seconds -- noticeably longer than with the smaller pure-PCMCIA cards -- to read the CF cards. I don't know if this is an issue with the CF card (as opposed to the PCMCIA card), or if it's just that the 200 (or Filer) is slow enough reading directories to be noticed. On the other hand, it's very nice to have that kind of capacity in a Palmtop...


I have used an AT&T 14,400 baud card modem (now discontinued, also) in my Palmtop with good results. NOTE: apparently, modems (at least the PCMCIA kind) don't work well with the Palmtops above 14,400 baud.
The EXP combination modem/flash memory cards are also very useful -- I recently bought (a used) one for myself, and it's wonderful (although I do make a point of running with the AC adapter when I'm on line with it or any other modem).

External Modems

Any Hayes-compatible external modem may be used with the Palmtops. See your user guide for details. Generally, you need a Palmtop serial cable (there are different cables for the 95LX and the 100/200LX) and possibly a 9-pin-to-25-pin serial adapter (usually $5-6 at any computer store). You should still use your AC adapter on your Palmtop when using the external modem for any length of time, since the serial port also uses a lot of power -- but then, you'll need to be near an outlet anyway to power the external modem. One advantage of the external modem is that the serial port, unlike the PCMCIA slot, allows speeds of up to 115,200 baud (I haven't actually tried plugging my Palmtops into an ISDN modem, but I can't see any reason why it wouldn't work).

AC Adapters

WARNING: the adapters for the 95 LX, and for the 100/200 LX, are NOT compatible. The 95 requires external power of 9 volts; while the 100/200 use 12 volts. Also, the 95 LX is designed to accept AC or DC power, while the 100/200 LX must have DC power, and the adapter must have a negative-tip plug (the inside is negative, while the plug barrel is positive. Furthermore, the HP 95 LX adapter (HP part 82241A) requires 120 volts at 60 Hz, while the HP 100/200 LX adapter (HP part F1011A #ABA) can take input of 100-240 volts at 50 to 60 Hz (in other words, it's a lot more forgiving on the input side, and can theoretically be used in other countries). So, do not try to use the 95 adapter with the 100/200, or vice versa -- especially if you're using the adapter to charge NiCad batteries (unless you like watching batteries explode...).

You can also use other manufacturer's adapters with the Palmtops, as long as they meet the output requirements given above and below. (Radio Shack adapters work quite well and are usually a heck of a lot cheaper...)

Voltage Requirements for Palmtops
95 LX 100/200 LX
7.8-12 volts (nomimal 12V) at 350 mA AC, 175 mA DC 9.6-14.4 volts (nominal 12V) at 750 mA DC only
These voltage requirements are taken from the HP 95LX, 100LX, and 200LX User's Guides. Confirm them with your Palmtop's User's Guide before plugging a non-HP adapter into your Palmtop.

Visit the HP Palmtop Ring Homepage

This HP Palmtop Ring Site is owned by Vinay N. Reddy, M.D. Visit The Webring.

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Copyright © 1996, 1999, 2000, 2002, 2004 Vinay N. Reddy, M.D. All rights reserved.
Written 08/20/96; major revision 04/05/00; last revised 05/10/04 counter