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80C390 has no flash inside. It's ROMless. I'm confident you know that and would like to fit and external flash and obvious program it.
One of the greatest feature of 80C390 is using the internal 4KB SRAM as combined program and data memory starting at 0x400000, loaded with bootstrap loader and run it without disturbing the 4MB external memory bus (0x00000 - 0x3FFFFF).
Can you be more specific what you want to do ?
Meanwhile, I shall take a look at demo provided by Winburn.
For a better approach and obvious if you have some money to spend, try the development board. It's exactly what you are looking for: boots from lazy EPROM, move the code inside faster SRAM and go from there. Add to this the CAN features provided by board. I know it's expensive, don't tell me that !
I told you before about the timed access requirements of 80C390 for fetch reading. If you'll use the MUX 573 things goes even worse, because you have to subtract the propagation time through 573 latch, even ACT series. The Flash chips will not be very happy with that. Obvious if you want to drive the micro at his full speed (10 MIPS). You can avoid the MUX, but you'll loose the P1 port (when the MUX pin is tied to high)
One of the 80C390's features that I like most, is the 1 KB stack option inside scratch pad space, which is excelent for C compilers.
Sorry Silvio. I am just a beginner with Dallas semiconductor. I have experience with another uC (Rabbit, MSP430, COP8, Z80, PIC). I´m trying to construct a temperature sensor board with DS1820. Please Silvio try to be more humble. Regards.