Comment by gjvc Comment by gjvc 20 hours ago 0 replies Copy Link View on Hacker News see also http://www.samhallas.co.uk/repository/po_docs/system_x.pdf and http://www.samhallas.co.uk/repository/journals/BTEJ/BTEJ%20V...and thishttps://www.academia.edu/39809466/System_X_The_history_of_th...by http://www.kingdom-technology.co.uk/malcolmhamer.php