As explained in another thread (partly working keyboard) I've tried replacing all the ICs and electrolytic capacitors of a clone keyboard to no avail. The only semiconductor left to try is the EPROM which I have no idea what does or what it contains. NOTE: the keyboard encoder is the replacement. The original one is marked:
The replacement (AY-5-3600-PRO) should be a fully compatible replacement.
But back to the EPROM, and knowing that they can lose their data after many years it would be useful to know if that's happened here or if it's still intact so I can look for the problem elsewhere. The EPROM is a 2716 and I've read its data using an EPROM programmer. I've attached that file here. Can someone take a look at the BIN file and see if the data makes sense? If not, does anyone have any idea what it contains and what it's for ?
The keyboard is part of an Asian (Japanese) Apple II+ clone. Its functions are basic (no pre-programmed function keys etc. as some of the clone keyboards had), but the "Power" LED switch (bottom left) has an upper/lower case function. If I recall correctly this only worked with the 80-column card. I don't think it made any difference in normal use. There's also a 2-way switch on the circuit board so you can choose between pressing the "RESET" key alone for resetting, or "CTRL" and "RESET".
Here are a couple of photos of the keyboard: