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owl [soylentnews.org] writes:

https://www.os2museum.com/wp/first-dual-channel-ide/ [os2museum.com]

The OS/2 Museum recently came into possession of what may be the first adapter with support for two IDE [wikipedia.org] channels… sort of:

The adapter was made by Plus Development Corporation [wikipedia.org], a subsidiary of the disk maker Quantum [wikipedia.org]. This particular specimen was manufactured in 1989, though its BIOS has a 1988 copyright.

The adapter is quite obscure for something made by a well known company. I could not find any information about it whatsoever. The only public reference to its existence is its FCC ID, EU95T8IMPULSE80-2 (note that Plus Impulse was a brand name under which some Quantum drives were sold). The FCC application [fccid.io] is from March 17, 1989, and it mentions a “hard disk controller card for internal & external hard disk drives”.

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