The 8086 had a __________ address/data bus, which meant that the address signals and the data signals shared the same pins on the chip. This meant that the address had to be latched into external circuitry before/after (circle one) the data. To accomplish the latching, the 8086 (and 8088) had an additional pin, called _______ to allow the external circuitry to latch in the address. The external circuitry is usually a set of __________ TTL chips