I/O port map

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  • Superscripts are used to mark ports specific to a given mode or platform:
    • Color mode: (color).
    • 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 llll 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 aaaa RW16 IRAM address (a)
$46 GDMA Length bbbb bbbb bbbb bbbb 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 r?ff RW8 Enable (e), Decrement (d), Target (t),

Repeat (r), Frequency (f)

System(color) $60 System Control 2 c4C. ?.?? RW8 Color (c), 4BPP (4), Chunky (C)
$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 8 Sample (s)
$69 Hyper Voice Right Input ssss ssss 8 Sample (s)
$6A Hyper Voice Control .mmc .... errr ffss RW16 Mask (m), Channel (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 .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 Sequencer Output Right .... ..ss ssss ssss R16 Sample (s)
$98 Sound Sequencer Output Left .... ..ss ssss ssss R16 Sample (s)
$9A Sound Sequencer Output Sum .... .sss ssss ssss R16 Sample (s)
System $A0 System Control t??? swcl RW8 Test OK (t), ROM speed (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)
Interrupts $B0 Interrupt Vector VVVV V... RW8 Vector offset (v)
UART $B1 Serial Data dddd dddd RW8 Data (d)
Interrupts $B2 Interrupt Enable iiii iiii RW8 Interrupt index (i)
UART $B3 Serial Control ebO. .tor RW8 Enable (e), Baud rate (b), Reset Overrun (O),

Transfer ready (t), Overrun (o), Receive ready (r)

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 Control .... .... PEWR ..rd RW16 Protect (P), Erase (E), Write (W), Read (R),

Ready (r), Done (d)

Cartridge $C0

$FF

Cartridge I/O Forwarded by the SoC
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