hi,


it happened that we work here at the similar project now. After half of year we will produce motherboard with next specifications [preliminary]:

MCU: Cygnal F120 / (lite version: F020)
Memory:
- 2Mb max. of main purpose memory;
- 2Mb max. of video memory;
- 8Mb of flash memory;
- 8kb (lite version: 2kb) of NV memory via SMBus;
Video:
- SVGA 800x600 (lite version: VGA 640x480);
- two layers (background + foreground);
- two playfields at each layer;
- palette: 256 independent colours for each layer; each colour is translated to truecolour 24-bit RGB via programmable LUTs;
- alpha channel (bright control) for each layer;
DMA:
- one channel upto 80 Mbytes/s (lite version: 53Mb/s) transfer rate;
- FIFO implemented;
- four modes of both source and destinator: off/MCU/main memory/video memory.
Sound: two channels via 12-bit DACs;
RTC;
SPI isolated channel;
RS-232;
RS-485;
1-Wire interface;
Inputs: upto 16 input lines (option: isolated);
Output: upto 16 output lines with high-voltage open drain;

Regards,
Oleg