I have one of the DIY Gertboards and have just assembled it the other day. There were no line driver ICs (MC74HC244AN) in the package. I went to my local electronics store (Jaycar) and they gave me a substitution of SN74HC244N as it was the closest thing that they kept in stock. Is this a suitable substitution? I ask as as I have noticed that sometimes touching the board with the Pi attached will turn the LED's off and on. I also saw this in the manual
""" Depending on the type of 74xx244 buffer chosen, the LED could behave randomly if the port is not
driven properly. In that case it may easily switch state, switching on or off with the smallest of
electronic changes, for example, when the board is simply touched."""
I haven't worked out how to control the Gertboard from the Pi yet so I am not sure if this is an actual problem or just a perceived problem. I would also hate to be pulling my hair out trying to figure out how to get the Pi to control the Gertboard if I had the wrong line driver installed.