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I've been working on something like that (actually with a Pentium), but the biggest problem is finding an FPGA with enough pins to connect to the CPU, RAM, per
by emh68 6y ago
I've been working on something like that (actually with a Pentium), but the biggest problem is finding an FPGA with enough pins to connect to the CPU, RAM, peripherals, etc. Maybe I need to use a cheaper FPGA to mux down the 64-bit-wide data bus (which this one seems to do with a CPLD). No matter how you cut it, it quickly becomes a pretty hairy design.
- Teknoman117 6y agoOh nice. It would be really awesome to see a homebrew socket-7 or super socket-7 system. The only thing that comes to mind that's not stupid expensive would be getting a PCB manufacturer to solder a 500 or 700 pin Lattice ECP5(-5G) FPGA to a board for you (the FPGA in single units is like $60). You can use the trellis/nextpnr open source toolchain with those. You'd probably need a 6 or more layer board, which isn't the cheapest thing... I'd been doing a M68K board with an ice40. I got some 68010's with the intention of implementing an MMU for funzies. Maybe try to boot Linux (sloooowly) on it. Got side tracked with a different project I thought would be more useful for people :)
- userbinator 6y agoI thought the Pentium was the start of not (publicly) documenting CPUs enough that anyone could build a computer around one?