Advice on Purchasing an HP

[grsbanks]

Examples of the HP-48G/S/X are not always easy to come across even if they would be an excellent replacement for the 28S. Back in the day I "graduated" from the 28S to the 48GX so I can confirm that the 48GX (or similar) is the closest to the 28S that you'll get nowadays without actually getting a 28S.

Another alternative you might wish to consider is the 50g. It's still an RPL machine in the lineage of the 28S and 48 gang but with more memory, more speed, bidirectional communication and an SD card slot. It still works with the HP-82240A/B printer just like the 28S and its successors.

The only real problem with the 50g that won't be fixed stems from the fact that it is actually an ARM CPU emulating the HP Saturn CPU and, because of the hardware differences, alarms don't switch the machine on if they become due when it's off.