I/O port map

The WonderSwan SoC has three general blocks of I/O port accesses:

From	To	Holder	Width	Speed
$00	$B7	WonderSwan SoC	16-bit	1 cycle
$B8	$BF	Internal EEPROM control	16-bit	1 cycle
$C0	$FF	Cartridge bus	8-bit	1(color)/2 cycles (configurable)

With the exception of internal EEPROM on the ASWAN, all unaligned 16-bit accesses can be converted to two 8-bit accesses with a 1-cycle penalty.

I/O port map

• Superscripts are used to mark ports specific to a given mode or platform:
  • Color mode: ^(color). Such ports are only accessible when color mode is enabled through port $60.
  • WS/WSC/SC console: ^(WS), ^(WSC), ^(SC).
• If two Bits rows are provided, the second one refers to the "Color" mode.
• The Type can be: R - readable, W - writable, L - writable before boot ROM lockout, 8/16 - width (byte/word).

Category	Port	Description	Bits	Type	Notes
Display	$00	Display Control	..ow Ws21	RW8
	$01	Display Background	.... .sss pppp iiii	RW8	Shade (s) Palette (p), Index (i)
	$02	Display Current Line	llll llll	R8	Line (l)
	$03	Display Interrupt Line	llll llll	RW8	Line (l)
	$04	Sprite Table Address	...a aaaa ..aa aaaa	RW8	Address >> 9 (a)
	$05	Sprite Table First	.iii iiii	RW8	Index (i)
	$06	Sprite Table Count	cccc cccc	RW8	Count (c)
	$07	Screen Address	.222 .111 2222 1111	RW8	Screen 1 address >> 11 (1) Screen 2 address >> 11 (2)
	$08	Screen 2 Window Left	xxxx xxxx	RW8	Coordinate (x)
	$09	Screen 2 Window Top	yyyy yyyy	RW8	Coordinate (y)
	$0A	Screen 2 Window Right	xxxx xxxx	RW8	Coordinate (x)
	$0B	Screen 2 Window Bottom	yyyy yyyy	RW8	Coordinate (y)
	$0B	Sprite Window Left	xxxx xxxx	RW8	Coordinate (x)
	$0C	Sprite Window Top	yyyy yyyy	RW8	Coordinate (y)
	$0E	Sprite Window Right	xxxx xxxx	RW8	Coordinate (x)
	$0F	Sprite Window Bottom	yyyy yyyy	RW8	Coordinate (y)
	$10	Screen 1 Scroll X	xxxx xxxx	RW8	Coordinate (x)
	$11	Screen 1 Scroll Y	yyyy yyyy	RW8	Coordinate (y)
	$12	Screen 2 Scroll X	xxxx xxxx	RW8	Coordinate (x)
	$13	Screen 2 Scroll Y	yyyy yyyy	RW8	Coordinate (y)
	$14	LCD Control	.... ..Ce	RW8	Contrast (C)(WSC), Enable (e)
	$15	LCD Icon Control	..32 1hvs	RW8	Auxillary 3 (3), Auxillary 2 (2), Auxillary 1 (1), Horizontal (h), Vertical (v), Sleep (s)
	$16	LCD Final Line	llll llll	RW8	Line (l)
	$17	LCD Back Porch Line(WSC)	llll llll	RW8	Line (l)
	$1A	LCD Status	...v vv.s	RW8	Volume segment status (v), Sleep (s)
	$1C	LCD Mono Shade LUT 0/1	1111 0000	RW8	Shade index
	$1D	LCD Mono Shade LUT 2/3	3333 2222	RW8	Shade index
	$1E	LCD Mono Shade LUT 4/5	5555 4444	RW8	Shade index
	$1F	LCD Mono Shade LUT 6/7	7777 6666	RW8	Shade index
	$20	LCD Mono Palette 0	.333 .222 .111 .000	RW16	Shade LUT index
	$22	LCD Mono Palette 1	.333 .222 .111 .000	RW16	Shade LUT index
	$24	LCD Mono Palette 2	.333 .222 .111 .000	RW16	Shade LUT index
	$26	LCD Mono Palette 3	.333 .222 .111 .000	RW16	Shade LUT index
	$28	LCD Mono Palette 4	.333 .222 .111 .000	RW16	Shade LUT index
	$2A	LCD Mono Palette 5	.333 .222 .111 .000	RW16	Shade LUT index
	$2C	LCD Mono Palette 6	.333 .222 .111 .000	RW16	Shade LUT index
	$2E	LCD Mono Palette 7	.333 .222 .111 .000	RW16	Shade LUT index
	$30	LCD Mono Palette 8	.333 .222 .111 .000	RW16	Shade LUT index
	$32	LCD Mono Palette 9	.333 .222 .111 .000	RW16	Shade LUT index
	$34	LCD Mono Palette 10	.333 .222 .111 .000	RW16	Shade LUT index
	$36	LCD Mono Palette 11	.333 .222 .111 .000	RW16	Shade LUT index
	$38	LCD Mono Palette 12	.333 .222 .111 .000	RW16	Shade LUT index
	$3A	LCD Mono Palette 13	.333 .222 .111 .000	RW16	Shade LUT index
	$3C	LCD Mono Palette 14	.333 .222 .111 .000	RW16	Shade LUT index
	$3E	LCD Mono Palette 15	.333 .222 .111 .000	RW16	Shade LUT index
DMA(color)	$40	GDMA Source Address Low	llll llll llll lll.	RW16	Linear address, low 16 bits (l)
	$42	GDMA Source Address High	.... hhhh	RW8	Linear address, high 4 bits (h)
	$44	GDMA Destination Address	aaaa aaaa aaaa aaa.	RW16	IRAM address (a)
	$46	GDMA Length	bbbb bbbb bbbb bbb.	RW16	Bytes (b)
	$48	GDMA Control	ed.. ....	RW8	Enable (e), Decrement (d)
	$4A	SDMA Source Address Low	llll llll llll llll	RW16	Linear address, low 16 bits (l)
	$4C	SDMA Source Address High	.... hhhh	RW8	Linear address, high 4 bits (h)
	$4E	SDMA Length Low	llll llll llll llll	RW16	Length, low 16 bits (l)
	$50	SDMA Length High	.... hhhh	RW8	Length, high 4 bits (h)
	$52	SDMA Control	ed.t rhff	RW8	Enable (e), Decrement (d), Target (t), Repeat (r), Hold (h), Frequency (f)
SoC(color)	$60	System Control 2	c4C. i?sl	RW8	Color (c), 4BPP (4), Chunky (C), Cart I/O wait state (i), SRAM wait state (s), Cart clock speed (l).
	$62	System Control 3	S... ...p	RW8	SwanCrystal (S), Power off (p)
Hyper Voice(color)	$64	Hyper Voice Left Output	ssss ssss ssss ssss	W16	Raw sample (s)
	$66	Hyper Voice Right Output	ssss ssss ssss ssss	W16	Raw sample (s)
	$68	Hyper Voice Left Input	ssss ssss	W8	Sample (s)
	$69	Hyper Voice Right Input	ssss ssss	W8	Sample (s)
	$6A	Hyper Voice Control	.mmc ???? errr ffss	RW16	Mask (m), Channel reset (c), Enable (e), Rate (r), Format (f), Shift (s)
Display(SC)	$70	LCD Timing Configuration 1?	???? ????	RL8
	$71	LCD Timing Configuration 2?	???? ????	RL8
	$72	LCD Timing Configuration 3?	???? ????	RL8
	$73	LCD Timing Configuration 4?	???? ????	RL8
	$74	LCD Timing Configuration 5?	???? ????	RL8
	$75	LCD Timing Configuration 6?	???? ????	RL8
	$76	LCD Timing Configuration 7?	???? ????	RL8
	$77	LCD Timing Configuration 8?	???? ????	RL8
Sound	$80	Sound Channel 1 Frequency	.... .ddd dddd dddd	RW16	Divider (d)
	$82	Sound Channel 2 Frequency	.... .ddd dddd dddd	RW16	Divider (d)
	$84	Sound Channel 3 Frequency	.... .ddd dddd dddd	RW16	Divider (d)
	$86	Sound Channel 4 Frequency	.... .ddd dddd dddd	RW16	Divider (d)
	$88	Sound Channel 1 Volume	llll rrrr	RW8	Left (l), Right (r)
	$89	Sound Channel 2 Volume	llll rrrr	RW8	Left (l), Right (r)
		Sound Channel 2 Voice Sample	ssss ssss	RW8	Sample (s)
	$8A	Sound Channel 3 Volume	llll rrrr	RW8	Left (l), Right (r)
	$8B	Sound Channel 4 Volume	llll rrrr	RW8	Left (l), Right (r)
	$8C	Sound Channel 3 Sweep Amount	vvvv vvvv	RW8	Value (v)
	$8D	Sound Channel 3 Sweep Ticks	...t tttt	RW8	Ticks (t)
	$8E	Sound Channel 4 Noise Control	...e rttt	RW8	Enable (e), Reset (r), Tap (t)
	$8F	Sound Wavetable Address	wwww wwww	RW8	Address >> 6 (w)
	$90	Sound Channel Control	nsv. 4321	RW8	Channel enable (1234) Noise (n), Sweep (s), Voice (v)
	$91	Sound Output Control	H... hrrs	RW8	Headphones connected (H) Headphone output (h) Speaker output (s), range (r)
	$92	Sound Channel 4 LFSR Register	.rrr rrrr rrrr rrrr	R16	PRNG state (r)
	$94	Sound Channel 2 Voice Volume	.... lLrR	RW8	Left Half (l), Full (L) Right Half (r), Full (R)
	$96	Sound Channel Output Right	.... ..ss ssss ssss	R16	Sample (s)
	$98	Sound Channel Output Left	.... ..ss ssss ssss	R16	Sample (s)
	$9A	Sound Channel Output Sum	.... .sss ssss ssss	R16	Sample (s)
	$9E	Sound Speaker Master Volume(color)	.... ..vv	RW8	Master volume (v)
SoC	$A0	System Control	t??? swcl	RW8	Test OK (t), ROM wait state (s), ROM width (w), Color system (c), Boot ROM lockout (l)
Timers	$A2	Timer Control	.... VvHh	RW8	Horizontal enable (h), auto reload (H) Vertical enable (v), auto reload (V)
	$A4	Horizontal Blank Timer Reload	tttt tttt tttt tttt	RW16	Ticks (t)
	$A6	Vertical Blank Timer Reload	tttt tttt tttt tttt	RW16	Ticks (t)
	$A8	Horizontal Blank Timer Counter	tttt tttt tttt tttt	R16	Ticks (t)
	$AA	Vertical Blank Timer Counter	tttt tttt tttt tttt	R16	Ticks (t)
?	$AC	?	.... ...p	W8?	Power off (p)
Interrupts	$B0	Interrupt Vector Offset	VVVV V...	W8	Vector offset (V)
		Interrupt Vector Request	vvvv vvvv	R8	Requested vector offset (v)
UART	$B1	Serial Receive Data	dddd dddd	R8	Receive buffer data (d)
	$B1	Serial Transmit Data	dddd dddd	W8	Transmit buffer data (d)
Interrupts	$B2	Interrupt Enable	iiii iiii	RW8	Interrupt index (i)
UART	$B3	Serial Status	eb.. .tor	R8	Enable (e), Baud rate (b), Transfer ready (t), Overrun (o), Receive ready (r)
	$B3	Serial Control	ebO. ....	W8	Enable (e), Baud rate (b), Reset Overrun (O)
Interrupts	$B4	Interrupt Status	iiii iiii	R8	Interrupt index (i)
Keypad	$B5	Keypad Scan	.iii oooo	RW8	Input row (i), Output column (o)
Interrupts	$B6	Interrupt Acknowledge	iiii iiii	R8?	Interrupt index (i)
	$B7	Interrupt NMI Control	...b ....	RW8	Low battery (b)
Internal EEPROM	$BA	Internal EEPROM Data	dddd dddd dddd dddd	RW16	Data (d)
	$BC	Internal EEPROM Command		RW16
	$BE	Internal EEPROM Status	.... .... p... ..RD	R16	Protected (p), Ready (R), Done (D)
		Internal EEPROM Control	.... .... pewr ....	W16	Protect (p), Erase (e), Write (w), Read (r)
Cartridge	$C0 $FF	Cartridge I/O		RW8	Forwarded by the SoC

I/O port routing

The NEC V30MZ supports 16-bit I/O port addresses. The WonderSwan SoC routes them using the following algorithm:

• If an address is between $00B8 and $00BF inclusive, it is routed to the internal EEPROM control block.
• If an address is between $00C0 and $00FF inclusive, it is routed to the cartride bus.
• If an address's bits 0 through 8 inclusive are between $000 and $0B7 inclusive, they are routed to the SoC block.
• If none of these conditions are reached, open bus is read.

On the monochrome models, as well as color models in mono emulation, open bus is always 0x90.