Hello!

I have made the custom rom mod to my Roland TR-707 and now i want to use a 27C4001 EPROM and switch banks with a DIP-switch.

Please would you help me, Adress A16 A17 A18 goes separeted to the DIP switch, but what should i connect the other side of the DIP-switch, Ground A15 .

And how should i program the chip, switch banks with the DIP and program 8 times with 8 separated rom binaries no

Kind regards and thaks in advance!

Johan