That darn Intel jingle...
cclist at sydex.com
Thu Nov 3 17:32:44 CST 2005
On 11/3/2005 at 6:22 PM ard at p850ug1.demon.co.uk wrote:
>The worst, by far, has to tbe the 8255 parallel chip. That was clearly
>designed by soembody who didn't think what he was doing. For those of you
>who've not read the data sheets, any write to the mode control register
>clears all output port lines to 0.
For what it is and WHEN it was developed, the 8255 is a pretty good device.
There are still new products made that use it (very popular in the data
acquisition area). I can't think of any other single parallel interface
chip from the 70's that's still puffing along.
I wish the thing was faster. The NEC 82C55AC variant is good to 10 Mhz,
but that's pretty slow when you're talking about a PCI bus.
There are precious few of the really good peripheral chips from the early
days of the microprocessor that are still as useful. The Signetics 2651
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