64-bit CPU

[James Knott]

What's that got to do with ancient CPUs?  ;-)


jon.dmml-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org wrote:
> this might be a stupid question but... what is better? pentium 4 with
> hyperthreading or AMD64?
> 
> 
> On Sat, 18 Sep 2004 14:50:41 -0400, John Macdonald <john-Z7w/En0MP3xWk0Htik3J/w at public.gmane.org> wrote:
> 
>>On Fri, Sep 17, 2004 at 08:14:38PM -0400, James Knott wrote:
>>
>>>John Macdonald wrote:
>>>
>>>
>>>>I've got the "TMS Microprocessor Data Manual" on my bookshelf,
>>>>it is dated November 1975.
>>>>
>>>
>>>I think I had (have?) one of those too.  Back in the 70's, I had several
>>>books on different CPUs. I seem to recall one, that used serial I/O for
>>>everything, including memory.
>>
>>Using serial I/O to access memory is not the 9900.  It had
>>a 16-bit data bus and a 15-bit address bus (it only used
>>16-bit word reads and writes - I think it had to do a read/
>>modify/write sequence to write a byte into memory).
>>
>>Serial I/O only interface sounds more like the microprocessors
>>that were aimed at device controller purposes; which had a
>>small amount of on-chip memory that was directly accessible
>>and only I/O interfaces to off-chip resources.  There were lots
>>of them that were variants of the 8-bit processors.  The point
>>there was to not require a memory interface and memory chips,
>>with the corresponding interface control lines and logic chips.
>>That kept the chip count and cost down for a device controller.
>>
>>--
>>
>>
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> 
> 
> 
> 

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