the makefile assumes that DRI ASM.COM is installed as a binary for zxcc. zxcc can be found at: http://www.seasip.info/Unix/Zxcc/zxcc-0.5.7.tar.gz or as part of the RomWBW github repo https://github.com/wwarthen/RomWBW
firmware, software, hardware and documentation for the fulcrum S100 omnidisk controller
much thanks to Michael Enkelis, the source of the corrected manual, a much-improved monitor and the BIOS.