Table 2.1 Interrupt factors

Bit assignment	Interrupt source	Interrupt source	vector number	level
bit 0	V-Blank-IN	VDP2	Vector 40	Level F
bit 1	V-Blank-OUT	VDP2	Vector 41	Level E
bit 2	H-blank-IN	VDP2	Vector 42	Level D
bit 3	Timer 0	SCU	Vector 43	Level C
bit 4	Timer 1	SCU	Vector 44	Level B
bit 5	DSP-End	SCU	Vector 45	Level A
bit 6	Sound-Request	SCSP	Vector 46	Level 9
bit 7	SMPC	SMPC	Vector 47	Level 8
bit 8	PAD interrupt	PAD	Vector 48	Level 8
bit 9	Level-2 DMA end	SCU	Vector 49	Level 6
bit 10	Level-1 DMA end	SCU	Vector 4A	Level 6
bit 11	Level-0 DMA end	SCU	Vector 4B	Level 5
bit 12	DMA-Illegal	SCU	Vector 4C	Level 3
bit 13	End sprite drawing	VDP1	Vector 4D	Level 2
bit 14	−
bit 15	−
bit 16	External interrupt 00	A-Bus	Vector 50	Level 7
bit 17	External interrupt 01	A-Bus	Vector 51	Level 7
bit 18	External interrupt 02	A-Bus	Vector 52	Level 7
bit 19	External interrupt 03	A-Bus	Vector 53	Level 7
bit 20	External interrupt 04	A-Bus	Vector 54	Level 4
bit 21	External interrupt 05	A-Bus	Vector 55	Level 4
bit 22	External interrupt 06	A-Bus	Vector 56	Level 4
bit 23	External interrupt 07	A-Bus	Vector 57	Level 4
bit 24	External interrupt 08	A-Bus	Vector 58	Level 1
bit 25	External interrupt 09	A-Bus	Vector 59	Level 1
bit 26	External interrupt 10	A-Bus	Vector 5A	Level 1
bit 27	External interrupt 11	A-Bus	Vector 5B	Level 1
bit 28	External interrupt 12	A-Bus	Vector 5C	Level 1
bit 29	External interrupt 13	A-Bus	Vector 5D	Level 1
bit 30	External interrupt 14	A-Bus	Vector 5E	Level 1
bit 31	External interrupt 15	A-Bus	Vector 5F	Level 1