As the title suggest, I am thinking about creating a new retro PC using some NOS NEC V20 chips and make it DOS compliant. Given that I have no plan of supporting any kind of floppy (Instead I have a USB interface chip that supports sector-level and file-level access to USB mass storages,) I use XT-SATA hard card (XT-IDE + a JMicron IDE to SATA chip + mSATA SSD all on one board) for local mass storage, and my board uses modern SRAM for system memory (which means no DRAM refresh,) do I even need to have the 8037 ISA DMA onboard?
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