Getting started with programmable logic, was Re: Cray 1 replica

For me, the FPGA brand would not be a problem,"Can I solder it to the PCB board for the Computer Replica I want?", is my problem Also remember to buy your switches when you can find them, blinky lights are cheap if you have the I/O lines. FPGA's take a bit of time to configure from ROM so a clean booting system may take a bit of thought. That is all I have to say, I am using CPLD's since I plan to build a classic 18 bit computer: AC, MAR, PC & MBR. So far 2 - 128 macro cell CPLD's will work for the Control & Alu sections. 1 - 64 macro cell cpld will handle I/O. The CPU has ADD,SUB,BIT(~ac&(mem)),DCA as the main data reference. Indirect ADD,SUB,BIT,DCA as well as BTB (bit byte indirect) DCB ( DCA byte indirect). Operate NOP,HLT,DI,EI,CLA,SZL,RCR,RCL. Control logic JZ,JLT,JGE,JSV(pc=(mem);ac=pc). Interupt after CLA,DCA. (ac=pc+2,jmp 0). 16KW direct address space,128 KB address space direct. 2.0 us memory cycle time. OP 2 us, mem/jmp 4 us,mem indirect 6 us. Ben.