Harvard Vs Von Neumann-we need some clarification here.

[Howardlong]

My opinion, for what it's worth, is that it's pushing it to consider a processor is Harvard just because it has a prefetch queue (all six bytes of it). The instructions still come from the the same bus that is shared with the data.

At the end of the day it ends up being little more than a subjective academic exercise putting different processors into different buckets such as RISC/CISC or von Neumann/Harvard. In practice when implementing a solution on a given device, what notional arbitrary bucket they might or might not be in is irrelevant: a more detailed and granular understanding is of far more relevance.

[commie]

TI83+,TI84+ and TI89,TI89T programmable calculators all use Von Neumann processors.I would be interested to know what was inside programmable PLC's

[ale500]

TI-(0, 82, 83 (all) 84 (all) 85 and 86 use a z80. TI-89 (all) use a 68000 like the TI-92 (all) and the Voyage 200.

[commie]

TI-(0, 82, 83 (all) 84 (all) 85 and 86 use a z80. TI-89 (all) use a 68000 like the TI-92 (all) and the Voyage 200.

Thats correct, all Von Neuman processors, I wonder why?

[ale500]

HP-35 till HP-41 use a Harvard arch.

[commie]

HP-35 till HP-41 use a Harvard arch.

The HP35/45 wasn't programmable but I'm not sure about HP-41?

[madires]

Most CPUs today are modified Harvard architecture, i.e. separate data and instruction caches, but common RAM.

[ale500]

The 41 was programmable, the 67 and 97 too and a couple models more.