If you're looking for an upgrade and/or do low-level stuff, the TI-36X Solar handles binary, hexadecimal, and octal quite nicely (though you do start running out of digits if you're trying to convert big numbers to binary). It also has a number of logic functions that you may or may not find useful.

Lately, I've been delighted by the equally competent fraction input/display system. I've been doing a lot of woodworking in US customary units, and the 36X beats the pants off of any other calculator I've owned[0].

Truly, it's a well thought-out little tool. So much so that when the display on mine pooped out, I went on eBay and found another one for 10 USD shipped.

[0] If somebody wants to recommend a dedicated builder's calculator that handles fractional inches handily, I'm all ears, but I haven't owned one to this point. Calculating board-feet would be a nice plus.

I'll ask for sure but I remember the folks in the vocational program (finish carpentry) using one they bought at Home Depot.

I loved my TI-34 as well, recently bought one off eBay for old times sake.

I love my TI-34. I still prefer to use it over an on-screen calculator when I'm doing reverse engineering or assembler programming. I got mine in 92 or 93 and it's still going strong.

Oh man, I didn't know that existed and now I want one.

Saved me a heck of a lot of time in assembler class with the decimal -> hex -> oct -> binary conversions and direct hexadecimal entry.

[edit: forgot about entering fractions directly - pretty good for a solar powered calculator]

Yeah, only downside is that with 64-bit numbers these days things could get a bit painful to enter.

All we need is someone to add bluetooth and let you send your clipboard over to it :).

I couldn't resist, just grabbed one off of ebay for $16, curse you for posting it!