Good documentation and works flawlessly
For Sharp PC1500 RAM Memory module 128K
RAM modules are hard to find and expensive. Plus you are limited to just one slot. So I order this module which gives you a huge 8 slots to store you programs on the battery backed-up module. The module comes with a detailed guide for initial setup and usage. You only need to type in a bunch of pokes to setup the module the first time and then its easy to switch banks. If you have a transfer cable this is probably the easier way to get the program on the computer rather then typing it in on the PC-1500 - which is what I did :-)