Beat me to it! ;-) I continue to use my (three!) HP 200 LXs in different parts of my lab for different reasons. The most 1-2-3 stuff is for analyzing S Parameters and other RF tasks (conversions, ratios, formulas, Smith Charts).
Two AA batteries power it for a least a month; you could recharge NiMH with the built-in charger if you wanted. I use the PCMCIA card slot to hold a battery-backed SRAM, allowing complete backup (via automatic macros) of the entire machine (dead main batteries are not killers, here in the pre-FLASH world).
And, the comm -- you can plug a special cable in to get 115,200 serial port. And you have IrDA --- I wrote the very first IrDA-compatible 'stack' on that machine (and at the time sold compatible discrete IrDA HW, so you could attach to another end, e.g. a PC).
Sorry to highjack a 1-2-3 thread with praise for the HP 200 LX, but that was (is) one HELL of an awesome machine, still in use in my lab to this day.
Two AA batteries power it for a least a month; you could recharge NiMH with the built-in charger if you wanted. I use the PCMCIA card slot to hold a battery-backed SRAM, allowing complete backup (via automatic macros) of the entire machine (dead main batteries are not killers, here in the pre-FLASH world).
And, the comm -- you can plug a special cable in to get 115,200 serial port. And you have IrDA --- I wrote the very first IrDA-compatible 'stack' on that machine (and at the time sold compatible discrete IrDA HW, so you could attach to another end, e.g. a PC).
Sorry to highjack a 1-2-3 thread with praise for the HP 200 LX, but that was (is) one HELL of an awesome machine, still in use in my lab to this day.