I am considering doing upgrades for the following two calculators. The 42s would be a simple 32 K RAM upgrade and the Hp48g would be either a 256K or a 512K RAM replacement upgrade. The 48G is fairly easy to Upgrade to 128K but since an Hp48G+ is readily available, it is not feasable to compete. (I would rather have a new calc with an Hp warranty, myself).
I do plan to provide a 30 warranty for the modification and either replace with another or restore with equalivent.
What do you guys think? Will it be worth it? I had a much easier time opening the 48G than I expected and does not show any mangleing that I have seen with other upgrades. However, whether I can do a 512K with a single chip or have to use two 128K chips will determine how worth while the project is.
To get to 128K is pretty straight forward (but as I said, not really worth it when you can get a 48G+). To get to 256K you have to piggy back another SRAM (not fun, and I would rather just land a 512 K RAM onto the pad instead of a 128K). But I am waiting on my 512K ram chip.
Any feedback?? I am listening.