The SPDI command lets you input data into the SPI. If a data parameter is given, the value is placed into the next slot in the SPI input buffer. If no parameter is given, a window displays the input buffer values. You can enter input values while the window is open. An arrow points to the next input value to the SPI. The maximum number of input values is 256 bytes.
>gdi SPDI [<n>]
Where: <n> The value to be entered into the next location in the input buffer
>gdi SPDI $55
Set the next input value to the SPI to $55
>gdi SPDI
Pull up the data window with all the input values.