Re: Seeing VERSIONINFO under Vista?

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Not to mention the ISA bus, which was ultimately the real bottleneck. In fact, the bus
architecture has *always* been the bottleneck!
joe

On Tue, 29 May 2007 19:45:25 +0200, "Bo Persson" <bop@xxxxxx> wrote:

Daniel James wrote:
:: In article news:<27rl531h1adc5l9sf927fn5jbria222f2t@xxxxxxx>,
:: Joseph M. Newcomer wrote:
::
::: Remember, we are looking at chips that had maximum clock speeds
::: of around 2MHz, but the PC, using a 4.77MHz chip, actually
::: EXCEEDED almost anyother "personal computers" of its day.
::
:: Well, ... a Z80 actually ran at 2, 4, or 6 MHz (depending on
:: model) and a 4MHz Z80A did most things faster than a 4.77MHz 8088,
:: but I take your point that the PC ran at a faster clock speed than
:: all the 8080, 8085, and 6502 machines that came before it. Even
:: so, when the PC was new many people asked why the 8088 was run at
:: "only" 4.77MHz (IIRC intel sold it as a 6MHz part).

Unfortunately that was the only 6 MHz chip they sold. :-)

Others, like I/O- and DMA-controllers, maxed out at 5 MHz. That was
the real limit on system design.


Bo Persson

Joseph M. Newcomer [MVP]
email: newcomer@xxxxxxxxxxxx
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm
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