Reply: Mod an MP3-CD player to accept HDD

Yes, its only PIO mode and not UDMA. But my humble point was that someone's used the 8255 as more than just a parallel port adapter.

snipped-for-privacy@yahoo.co.uk (Siddhartha Jain) wrote in > news: snipped-for-privacy@posting.google.com: > > >> >> Then why do Stand-alone MP3-CD player projects like the ones I > >> >> mentioned below use a IDE controller (Intel 8255A)? > >> > > >> > IIRC an 8255 is a fairly simple parallel port adapter. > >> > >> I was thinking the same thing. I never thought of the venerable 8255 > >> I/O expander as an IDE controller. I mean try an command the 8255 to > >> READ DMA and see what it does. :-) > > > Well, someone seems to have done it. Check this: > >
formatting link
> > > >:) > > No, they didn't. This example is PIO. UDMA transfers cannot be > accomplished with an 8255 acting as the "disk controller". The IDE > interface in PIO mode is quite similar to a plain old chip selected device > like an SRAM or FLASH chip so, yes, you can do that with an 8255. Of > course if you just use a chip with more I/Os then you wouldn't even need > the 8255.
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Siddhartha Jain
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