RAMBO_BASE
#define RAMBO_TCOUNT (RAMBO_BASE+0xc00) /* Timer count register */
#define RAMBO_TBREAK (RAMBO_BASE+0xd00) /* Timer break register */
#define RAMBO_ERREG (RAMBO_BASE+0xe00) /* Machine error register */
#define RAMBO_CTL (RAMBO_BASE+0xf00) /* Machine control register */
if (bus_space_map(ca->ca_bustag, RAMBO_BASE, sizeof(struct rambo_ch),