| 摘要 |
A point-of-sale (POS) system is based on a portable computer. The POS system includes a main processor to which a host central processing unit (CPU) and a software graphics application program interface (API) are mounted; a memory interface to which a memory chipset and a bus-to-device component are mounted; a graphics system to which a graphics accelerator, a Rambus arbiter peripheral component interconnect (PCI), a direct memory access (MA), a random access memory digital-to-analog converter (RAMDAC), a queue and a block write are mounted; an internal monitor as a first monitor; a wireless module, which wirelessly transmits graphics data; and an external monitor, which displays graphics data that is received wirelessly or via wires from a portable computer. The portable computer supports the external monitor with a copy mode, an expansion mode, and an extension mode. |
