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The 1st IBMXT with the 8088 processor had an 8-bit external data bus & run at a speed of 4.77MHZ.

IBM released the AT(Advanced Technology), PC with 80286 processor had an 16-bit processor. The designers added a bus that allowed insertion of either an 8-bit card or one 16-bit card. The change was made in the standard 16-bit slot. Thus new 16-bit bus officially run at a top speed of 8.33 MHz.

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