I’ve been reading about older processors (8080, 8086 and that) and i’ve seen that those older 8-bit processors had some 16-bit instructions through the use of register pairs. For example, on the 8080, the XCHG instruction exchanges the value from the HL pair and the DE pair. if these registers are 8 bits wide, and the internal bus is 8bits wide, how did the processor exchange the values with one instruction?
Thanks