Symbolics 1200XL

Sridhar Ayengar wrote: I think there's a lot of rom in the ivory, but I think the core logic would fit. Given that you could do a 400mhz ddr-2 interface in today's fpga's, and run with an internal clock of, well, maybe 266mhz on a good day, it should be a lot faster. I was hoping someday someone would pop up with a cad tape of the ivory. It would be fun to turn it into verilog. I've never seen one, however. I've seen schematics for the 3600, and they are complex. The "G" machines where put into fpga's (probably standard cell) but I've never seen cad files or schematics. To be honest, running an emulation of the ivory on a dual core 64 bit x86 chip at 3ghz is really fast and plenty snappy. I did compile the original CADR into an fpga. It would synthesize with the original clock speed. I don't recall how much margin there was; the ALU paths are pretty slow. I have not actually run it in hardware, but some day I will, just for fun. It would make a nice desktop curio in clear plastic. -brad