BORLAND Turbo Debugger documentation mentions hardware debuggers from: Atron, Periscope, Purart. Purart Trapper was an ISA card sniffing buss activity with abi

BORLAND Turbo Debugger documentation mentions hardware debuggers from: Atron, Periscope, Purart. Purart Trapper was an ISA card sniffing buss activity with ability to break on set conditions https://archive.org/details/PC_Tech_Journal_vol07_n04/page/n27/mode/2up https://archive.org/details/PC_Tech_Journal_vol07_n04/page/n... Atron also ISA card https://textbooks.cs.ksu.edu/cis642-643/1-history-of-software/05-evolution-of-programming/ https://textbooks.cs.ksu.edu/cis642-643/1-history-of-softwar... very proud of being used by Oracle :) https://archive.org/details/byte-magazine-1987-08/page/n21/mode/2up https://archive.org/details/byte-magazine-1987-08/page/n21/m... Periscope software? with NMI button, optional ISA ram boards to hide debugger and CPU interposers http://www.os2museum.com/wp/have-you-ever-used-one-of-these/ http://www.os2museum.com/wp/have-you-ever-used-one-of-these/ Afaik none of those used intel secret sauce ICE functionality. Of course with 386 we got SoftICE.