IBM PC Use
Although the 8237 was introduced with the 8-bit 8085 processor family, it is compatible with the 8086/88 microprocessors. A limitation on the IBM PC (AT) compatibles is that the 8237 at 0x00 and 74LS612 at 0x80 only can address 16 megabyte of memory; this is because the IBM AT, which introduced the dual 8237 DMA controller design, has an Intel 80286 microprocessor, which can directly address a maximum of 16 MB. This means that for other memory areas the data has to be transferred to a buffer first, and then moved to the final memory by the CPU. This is called "bounce buffer".
Read more about this topic: Intel 8237