Both 8088 and 8086 are 16bit cpus, also 80188 and 80186 they differ only in external bus width. That bus width has no programatic effect in that binaries are the same for both. Internal register sizes are same for both flavors. The 68K also had the 68008 a 32bitter that had a narrow data bus. DEC T-11 (PDP-11) also had the option at reset time to configure the bus as 8bit wide or 16bit. The Z280 also had this option. However the T-11 is without question 16bits and the Z280 is 8bit. The 386SLC and 486slc were both 32bit but had a 16bit wide bus for interface convenience. The point is bus width only determins bus bandwidth and performance and is not the say all for "xx width" cpu. Allison