Fab

I’ve not done this, but I did ask Andi of the FPGASID project the same question and he sent this reply: “Yes, I think this should be possible. FPGASID can be configured in a way that it listens to two separate chip select lines that are used to select one or the other internal SID. As far as I have seen in MidiBox schematics so far, the two SID sockets are conntected to a single data and address bus and only the chip select lines are separated for the two SIDs. Such a scenario can be supported by FPGASID. Many people do the same thing on the Ultimate64 which is a FPGA-based C64 but with two SID sockets.These steps would have to be done:1. Use a C64 to configure the FPGASID to stereo mode with the Address DE00 enabled and all other adresses disabled. Then save the configuration to flash mem A (power up default)2. Plug the FPGASID into one of the sockets3. Connect the chip select signal of the second socket to the red wire of the 3-wire-cable of the FPGASID (DE00 chip select signal)4. Connect the raw-audio signal of the FPGASID (solder eye on the FPGASID PCB) to the AUDIO signal of the second SID socket.That should do it.There are some constraints to consider:* The FPGASID has only one single external audio input and ony pair of paddles that are shared between both SIDs inside FPGASID.* You will need some control software as part of the MidiBox software to change the FPGASID settings (switching between 8580 and 6581 mode etc) in case you whish to do so.* You will need a C64 for step 1 OR, in case you do not have one, you will need special setup function in the Midibox software to enable stereo mode each time it powers up.” This is beyond my abilities though (there’s a reason I went for the sammichSID over a ground up midi box), so I was coming here to see if anyone had any ideas on how to implement this.