1.4 OS for the K4, exactly the one I'm using into my keyboard, ready to be burn using any EPROM programmer which can support the necessary memory chip for the K4; the specs of the chip are as follows: type 27C512 or W27C512, format DIL-28, less than 150ns response time.
I bought the empty Eprom chip for less than 3 Euros and asked a friend of mine with an Eprom burner device to do the burning job for me: it works perfectly!
The old Eprom is not soldered to the board but installed in a chip holder, so you just need to extract the old one and replace it with the new. Turn on the K4 and enjoy!
» Author: clayfalcon dtd. 20.09.2014
» Total Hits: 199