Abstract: A method and system is provided for emulating individual JTAG devices in a multiple device boundary scan chain. One or more target devices within the scan chain are selected, and other devices within the scan chain may be placed into bypass mode. Packets associated with particular emulation sequences are sent to a server, and subsequently sent to an accelerator which buffers the packets in a first memory device until a sequence is completed. The completed sequence is then transmitted to the scan chain, while packets associated with another sequence are concurrently buffered in another memory device in the accelerator. The emulation sequences sent to the target bypass the other device(s) and are executed by the target device(s).