How is the memory accessed on the 3514 and the 5104 synchronous serial adapters?

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The Zilog 16C32-based 3514 and 5104 have 256 K of memory on the adapters that are used for buffering the input and output data. To aid in transfer efficiency, the Windows SeaMAC V5 driver conducts 32-bit transfers from the adaptersÂ’ memory to the system memory until there are less than four bytes to transfer. The remaining (1-3) bytes use 8-bit transfers.