The 28C which is essentially the same calculator (which i got new in December 1987) got me all the way thru Mechanical Engineering many decades ago. It was way ahead of any calculator existing at the time. It sadly is more powerful than the 48 that came later, just with a smaller screen. I think I now own 4 HP 48's. I still only have one 28, but it's the one that follows me to work everyday. It can do symbolic derivatives, and both symbolic and numerical integration. Something unheard of in the 1980's. The unit conversion is also very powerful. A hidden trick when you are looking for a unit just hit the first letter or symbol of that unit and it takes you to those units starting with that character.
One of the most unique HPs in my opinion. It’s great to see you making a series on it. Couldn’t help but notice your battery door, mine’s barely hanging on. It’ll eventually need the tape treatment too
Interesting...I just found my 28s. It works perfectly, however the battery-door on mine is on its way out! Seems like that part of the design could have been greatly improved. Also, the battery type required me to order from Amazon as I could not find any locally. Not a big deal though and the calculator is fun to use!
Finally your first HP-'Graphing calculator', the mother of all the RPL-calculators that followed. :-) You should definitely try an 48GX/G/G+ if you want a neat, powerful and quality machine. This one is a bit fragile and not as easy to operate while holding it in your hands. (The battery door is clumsy too) The quality of the keys are not that great either (good, but not great, especially coming from an 41CV) and extremely difficult to repair. I also have one of those, but my 5-key is a bit worn. Sometimes if I press it, it registers multiple times, like 5555 comes up. (My only HP-calculator that does that, after extensive use of course)
@@west Looking forward to that! :-) I also have a 50G, quickly grabbed a new one (for cheap), while they were still sold here and there a few years back. This is their most powerful one for the engineer, I think. A pity, the quality is a bit less and it's not running at it's full potential speed. (It emulates the old SATURN-processor instruction set, making it slower then it should, also consuming more power then it should) I'm eagerly waiting for a powerful new machine, with an RPL-OS like the 50G with the quality of the 48GX and the speed of the prime, with expandability (like SD-card, bluetooth/wifi) and normal batteries. Wishful thinking I guess ;-). The higher the speed, the more power it consumes...
The 28C which is essentially the same calculator (which i got new in December 1987) got me all the way thru Mechanical Engineering many decades ago. It was way ahead of any calculator existing at the time. It sadly is more powerful than the 48 that came later, just with a smaller screen. I think I now own 4 HP 48's. I still only have one 28, but it's the one that follows me to work everyday.
It can do symbolic derivatives, and both symbolic and numerical integration. Something unheard of in the 1980's.
The unit conversion is also very powerful. A hidden trick when you are looking for a unit just hit the first letter or symbol of that unit and it takes you to those units starting with that character.
One of the most unique HPs in my opinion. It’s great to see you making a series on it. Couldn’t help but notice your battery door, mine’s barely hanging on. It’ll eventually need the tape treatment too
Yes, it's unfortunate. Mine was in multiple pieces when I got the calculator. Looks terrible but hey, it works!
@@west mine is still in very good shape, also the battery-door, but yeah, that 5-key :(
Interesting...I just found my 28s. It works perfectly, however the battery-door on mine is on its way out! Seems like that part of the design could have been greatly improved. Also, the battery type required me to order from Amazon as I could not find any locally. Not a big deal though and the calculator is fun to use!
That's a wonderful old calculator, would love to have one.
Definitely a unique one!
I just snagged me one of these. :)
Finally your first HP-'Graphing calculator', the mother of all the RPL-calculators that followed. :-) You should definitely try an 48GX/G/G+ if you want a neat, powerful and quality machine. This one is a bit fragile and not as easy to operate while holding it in your hands. (The battery door is clumsy too) The quality of the keys are not that great either (good, but not great, especially coming from an 41CV) and extremely difficult to repair. I also have one of those, but my 5-key is a bit worn. Sometimes if I press it, it registers multiple times, like 5555 comes up. (My only HP-calculator that does that, after extensive use of course)
I've had a 48g in the past and also have a 50g I'll get around to filming eventually :)
@@west Looking forward to that! :-) I also have a 50G, quickly grabbed a new one (for cheap), while they were still sold here and there a few years back. This is their most powerful one for the engineer, I think. A pity, the quality is a bit less and it's not running at it's full potential speed. (It emulates the old SATURN-processor instruction set, making it slower then it should, also consuming more power then it should) I'm eagerly waiting for a powerful new machine, with an RPL-OS like the 50G with the quality of the 48GX and the speed of the prime, with expandability (like SD-card, bluetooth/wifi) and normal batteries. Wishful thinking I guess ;-). The higher the speed, the more power it consumes...