Editing Intel 8088 (section)

===Differences from the 8086===
The 8088 is architecturally very similar to the 8086.  The main difference is that there are only eight data lines instead of the 8086's 16 lines.  All of the other pins of the device perform the same function as they do with the 8086 with two exceptions.  First, pin 34 is no longer {{overline|BHE}} (this is the high-order byte select on the 8086—the 8088 does not have a high-order byte on its eight-bit data bus).<ref name="Osborne">Osborne 16 bit Processor Handbook (Adam Osborne & Gerry Kane) {{ISBN|0-931988-43-8}}.</ref>{{rp|5–97}}  Instead it outputs a maximum mode status, {{overline|SS0}}.  Combined with the IO/{{overline|M}} and DT/{{overline|R}} signals, the bus cycles can be decoded (it generally indicates when a write operation or an interrupt is in progress).  The second change is the pin that signals whether a memory access or input/output access is being made has had its sense reversed.  The pin on the 8088 is IO/{{overline|M}}.  On the 8086 part it is {{overline|IO}}/M.  The reason for the reversal is that it makes the 8088 compatible with the [[Intel 8085|8085]].<ref name="Osborne"/>{{rp|5–98}}