Had the AIM alliance decided to put 68k compatibility mode into the PPC, in the same way intel kept the pentium compatible with the x86... I believe the PPC would have had an equal share of the desktop market by now.
The PowerPC was invented for Apple, they got 68K compatibility by doing it in software. Doing it in hardware would of probably have proven as successful as Intel's attempt to do x86 compatibility in the Itanium (which they have removed because it's faster to do it in software) or the PPC 615.
The core of 68K PC market was flawed i.e. Motorola was unable to keep pace with the other CPU vendors in the desktop market. Screwing (cut&paste) up the ISA standards are one of the main factors why the customers don’t stick with a particular platform. Motorola use to have PC vendors such as HP, DEC and SUN building 68K based workstations.
No, they did their own in house RISC designs and the 68K couldn't keep up.
Motorola did do their own RISC design (the 88K series) but it never sold in sufficient numbers and died off. Parts were reused in the PowerPC series though (the original PowerPC bus was straight ou of an 88K).
Intel also did a RISC design (the i860) but it never took off either.
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Remember that the Amiga was never about high CPU speeds, everything intensive was done by the chip-set, had they of survived that strategy most likely would have continued.
Commodore's failure though was all interal. Had they of got the AAA + DSP machine out in the early 90's it would have been an absolute killer - and Hombre would have later killed it. If they had buit an Amiga with that technology things could have turned out very different.
Read this
interview, it appears to be from 1997, interesting stuff...