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Sergey, I've been thinking about a 16-bit 68000 system even before the ECB Mini-68K CPU board was produced. A couple of conclusions: It is easier to interface a 68020 or 68030 to the ECB than it is to interface a 68000 or 68010. The last two do not drive A0 -- so byte operations become complicated. The dynamic bus sizing on the 68020/030 are very convenient. Memory probably needs to be on a separate card. The 4MEM board has a 16Mhz limit with both the SBC-188 and Z180 Mark IV. This may be due to the MMU on-board that card, but any discrete MMU will slow things down a little. The integrated MMU on the 68030 becomes attractive. My own interest is really "retro," so I still like the idea of a 68000 or 68010; however, the MMU will probably have to be on the CPU card itself. So this tends to dictate a double-width Eurocard, like that one used on the new 6x0x board, a board with an MMU. (VME is also double-width Eurocard, but uses 2 connectors, rather than the ECB single connector.) My own choice would be to stick with ECB, and to be compatible with existing peripheral cards. --John On 10/03/2014 11:54 AM, Sergey wrote:
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