There's a few options to get XTs USB (at least for storage) based on CH374, CH375, or CH376 controller chips. They work even with the 5150. I think it's sort of a serial interface to the USB storage standard made popular by Arduino and ESP microcontrollers with either a driver or BIOS ROM to emulate an ATA HDD interface. It works with FreeDOS in Emile's Homebrew 8088/XT platform as well as generic Chinese produced "USB ISA Industrial Adapter Cards". Emile recently converted his work to an ISA card as well.
TechTangents review of the Chinese produce ISA cards https://youtu.be/cgtvVi_mjjg Emile speaking about his ISA card https://youtu.be/CXDWjbcrNuI https://youtu.be/1U_qIWisEQY Lo-tech USB ISA Card https://www.lo-tech.co.uk/wiki/Lo-tech_ISA_USB_Adapter Ebay boards https://www.ebay.com/sch/i.html?_nkw=ISA+to+USB+Adapter+Board Emile's ISA USB card https://www.ebay.com/itm/155692675249 Emile's 8088 mainboard with an interface to CH376 add-on board https://www.ebay.com/itm/155691062888? Emile's Designs (USB ISA Card not yet posted) https://github.com/homebrew8088/8088-PC-Compatible On Thu, Aug 3, 2023 at 9:37 AM Bret Johnson via Freedos-devel < freedos-devel@lists.sourceforge.net> wrote: > > Yeah, USB and CD/DVD makes only sense for a 386+ ... > > USB, yes. CD/DVD, no. USB requires PCI which in turn requires 386+. > Actually, there were supposedly USB host controllers manufactured for the > ISA bus instead of PCI, but I've never actually seen one. But USB > protocols assume you're using a 32-bit (and in some cases 64-bit) CPU so > USB really only makes sense on 386+, though you could probably make things > work on a lesser CPU if you absolutely had to. >
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