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Old 24 May 2017, 14:50   #8
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 43
Posts: 20,635
PIO is mandatory in ATA specs and ATA drives power up in PIO mode. There is also very old non-UDMA DMA modes that have existed since ages ago that no one ever remembers

Those adapters most likely assume UDMA support and use it even if drive does not support it.

Anyway, mainboard IDE controller (from era when they still existed) practically always work with ancient drives, some really bad drives may need forcing PIO0 in BIOS.
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