> The other reason is that the Deskpro 386 was almost certainly the first PC where ROM shadowing made a real difference. The Deskpro 386 had 32-bit RAM, signifi

> The other reason is that the Deskpro 386 was almost certainly the first PC where ROM shadowing made a real difference. The Deskpro 386 had 32-bit RAM, significantly faster than 16-bit ROMs. That was not the case with 16-bit PC/AT compatibles with slower CPUs, slower RAM, and a 16-bit data path to both RAM and ROM. On the Deskpro 386, the system RAM was likely several times faster than ROM, and that’s what made ROM shadowing desirable. Also it doesn't make sense to push for a faster ROM if it's wouldn't be utilized or benefit anything.