Re: (MS-)DOS PC on a microcontroller??

On Wed, 24 Oct 2007 18:16:55 GMT, "FreeRTOS.org" <noemail@xxxxxxxxxxx>
wrote:

I think what I am saying is - I don't understand your question.

O.K. Take one of the first old PCs with a floppydisk-drive, a keyboard
and a Hercules Monitor and look at it as a black box. Take an
identical PC and remove all the interiority but leave the
floppydisk-drive and the connectors to the monitor and the keyboard.
Take a singlechip-microcontroller. Connect every pin of the
floppydisk-drive, the keyboard and the monitor to a pin of the
microcontroller. Write a program for the microcontroller, which makes
the second blackbox identical with the first blackbox. Now you can put
a (MS-)DOS installation diskette in both and both will install it. Now
you can put another diskette with an original MS-DOS program from the
old times and start it. Both blackboxes will execute the programm the
same way. The microcontoller has become a (MS-)DOS PC.

There is only one thing left. The pins of the microcontroller will not
be able to drive i.e. the monitor-pins directly, because the pins of
the microcontroller only drive a few milliamperes. Thus it is allowed,
to adapt the (5V/3,3V or similar) pins of the microcontroller to the
voltage and the current of the floppydisk-drive, the monitor and the
keyboard by accordant transistors. But it is not allowed to give up
the one-pin-peripherie to one-pin-microcontroller concept. The
"brainpower" for driving/receive every pin of the periphery has to
come from the microontroller and not from any external chip. I hope,
the job definition is clear now.

And the question is: Are nowadays singlechip microcontrollers powerful
enough, to manage this problem.
.

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