# 0x18 ZM_INTR_MASK_BYTE_7_OFFSET
# 0x20 ZM_INTR_GROUP_OFFSET
+* BIT7 - group INTR 7
+* BIT6 - group INTR 6
+* BIT5 - group INTR 5
+* BIT4 - group INTR 4
+* BIT3 - group INTR 3
+* BIT2 - group INTR 2
+* BIT1 - group INTR 1
+* BIT0 - group INTR 0
+These bits indicate if fallowing groups got some interrupt.
+
# 0x21 ZM_INTR_SOURCE_0_OFFSET
+* BIT7 - abort interrupt? should be cleared first?
+* BIT6 -
+* BIT5 -
+* BIT4 - ep0 CMD_FAIL
+* BIT3 - ep0 CMD_END
+* BIT2 - USB EP0 OUT/rx interrupt
+* BIT1 - USB EP0 IN/tx interrupt
+* BIT0 - ep0 SETUP
+
# 0x22 ZM_INTR_SOURCE_1_OFFSET
# 0x23 ZM_INTR_SOURCE_2_OFFSET
# 0x24 ZM_INTR_SOURCE_3_OFFSET
# 0x25 ZM_INTR_SOURCE_4_OFFSET
# 0x26 ZM_INTR_SOURCE_5_OFFSET
# 0x27 ZM_INTR_SOURCE_6_OFFSET
+
# 0x28 ZM_INTR_SOURCE_7_OFFSET
+* BIT7
+* BIT6
+* BIT5
+* BIT4
+* BIT3
+* BIT2
+* BIT1 - USB reset interrupt.
+* BIT0
# 0x3F ZM_EP_IN_MAX_SIZE_HIGH_OFFSET
# 0x3E ZM_EP_IN_MAX_SIZE_LOW_OFFSET