sped3_setup.c

void sped3_setup(void* pointer, unsigned int count)
{
    __asm
    {
        SET PUSH, Y ; Preserve stack pointer

        .IMPORT _stubapi_locate_device
        SET A, 0x42ba ; Set the SPED3 ID (0x42babf3c)
        SET B, 0xbf3c 
        JSR [_stubapi_locate_device] ; Call the locate_device system function

        SET PUSH, A ; Keep the value returned by locate_device
        SET A, 0x1 ; Tell the SPED-3 where our vertices are
        SET X, <pointer>
        SET Y, <count>
        HWI POP ; Interrupt the SPED-3

        SET Y, POP
    }
}