68k homebuilts

A simple design with a real 68K processor isn't that hard to whip up or debug - in fact not much harder than a simple 6502 or Z80 system. SRAM, of course, is simpler to implement than DRAM, but DRAM can be easier to expand over a couple of MB (for 1MB or less, I'd stuff in a couple of JEDEC RAM sockets for a 16-bit RAM field). Let me amend "simple" - simple is peripheral chips and memory that can keep up with the cycle time of your processor so that you don't have to handle wait-states, etc., and can therefore tie DTACK to ground (as advocated by a famous newsletter, "DTACK Grounded". At 4MHz to 8Mhz, it shouldn't be a problem these days unless you have a particular VLSI chip you want to use for I/O (6821, 6522, etc.) and it isn't fast enough. ROM and RAM that are fast enough shouldn't be an issue, even with inexpensive parts.