VT100, using a ground spring, with the 74S299 removed and the probe and ground spring directly connected to the socket. It shows a slight -20mV negative spike, but it varies between -20mV and -80mV:
VT100, using a ground spring, with the 74S299 removed and the probe and ground spring directly connected to the socket. It shows a slight -20mV negative spike, but it varies between -20mV and -80mV:
Rob's Old Computers 
