Delete comment from: Ken Shirriff's blog

rastakins said...

Since the 8088 and 8086 post-queue logic appears to be essentially the same, once the queue is MT, does the 8088 have to wait for all 16 bits to be pre-fetched before the first byte can be drawn from the queue? If so, a sequence of instructions such as XCHG AX,BX, INC CX might take 4+4+3+2 clocks. If the first byte could be drawn from the queue immediately after it was fetched, the delay might be 4+4+2 with the execution time of the XCHG AX,BX being overlapped by the second fetch.

Apr 2, 2024, 1:31:47 PM

Posted to The Intel 8088 processor's instruction prefetch circuitry: a look inside