i was testing and cleaning chips on a spare mcr boardset i have, and noticed that the z80's were slightly warm (but not very) to the touch. normal for those to run a little warm?
Z80 will have a warm spot in the middle, thats normal. If you cant keep your finger on it something is wrong. Most TTL run cool but a few like LS244, 245, 377...most of the 20 pin ones run warm. Not hot but warm to the touch.