Hardware Registers

R	Read-Only
W	Write-Only
M	Read/Write
0	Always 0
1	Always 1
X	Unknown / Unused
S	Strobe. Writting and reading does not work as expected

Register	7	6	5	4	3	2	1	0	Description
00	X	X	X	X	X	X	X	X	Unknown
01	X	X	X	X	X	X	X	X	Unknown
02	X	X	X	X	X	X	X	X	Unknown
03	X	X	X	X	X	X	X	X	Unknown
04	X	X	X	X	X	X	X	X	Unknown
05	X	X	X	X	X	X	X	X	Unknown
06	X	X	X	X	X	X	X	X	Unknown
07	X	X	X	X	X	X	X	X	Unknown
08	0	0	0	0	0	0	W	M	Second Counter Control
09	R	R	R	R	R	R	R	R	Second Counter (Low byte)
0A	R	R	R	R	R	R	R	R	Second Counter (Mid byte)
0B	R	R	R	R	R	R	R	R	Second Counter (High Byte)
0C	X	X	X	X	X	X	X	X	Unknown
0D	X	X	X	X	X	X	X	X	Unknown
0E	X	X	X	X	X	X	X	X	Unknown
0F	X	X	X	X	X	X	X	X	Unknown
10	X	X	X	X	X	X	X	X	Unknown
11	X	X	X	X	X	X	X	X	Unknown
12	X	X	X	X	X	X	X	X	Unknown
13	X	X	X	X	X	X	X	X	Unknown
14	X	X	X	X	X	X	X	X	Unknown
15	X	X	X	X	X	X	X	X	Unknown
16	X	X	X	X	X	X	X	X	Unknown
17	X	X	X	X	X	X	X	X	Unknown
18	X	X	X	X	X	X	X	X	Unknown
19	X	X	X	X	X	X	X	X	Unknown
1A	X	X	X	X	X	X	X	X	Unknown
1B	X	X	X	X	X	X	X	X	Unknown
1C	X	X	X	X	X	X	X	X	Unknown
1D	X	X	X	X	X	X	X	X	Unknown
1E	X	X	X	X	X	X	X	X	Unknown
1F	X	X	X	X	X	X	X	X	Unknown
20	X	X	X	X	X	X	X	X	Unknown
21	X	X	X	X	X	X	X	X	Unknown
22	X	X	X	X	X	X	X	X	Unknown
23	W	W	W	W	W	W	W	W	IRQ Enable
24	W	W	W	W	W	W	W	W	IRQ Enable
25	W	W	W	W	W	W	W	W	IRQ Enable
26	W	W	W	W	W	W	W	W	IRQ Enable
27	S	S	S	S	S	S	S	S	IRQ Strobe
28	X	S	S	S	S	S	S	X	IRQ Strobe
29	S	S	S	S	S	S	S	S	IRQ Strobe
2A	S	S	X	X	X	X	X	X	IRQ Strobe
2B	X	X	X	X	X	X	X	X	Unknown
2C	X	X	X	X	X	X	X	X	Unknown
2D	X	X	X	X	X	X	X	X	Unknown
2E	X	X	X	X	X	X	X	X	Unknown
2F	X	X	X	X	X	X	X	X	Unknown
30	M	X	X	X	X	M	W	M	Timer 0 control
31	X	X	X	X	X	X	M	M	Timer 0 control
32	M	M	M	M	M	M	M	M	Timer 0 scalar low
33	M	M	M	M	M	M	M	M	Timer 0 scalar high
34	M	M	M	M	M	M	M	M	Timer 0 event low
35	M	M	M	M	M	M	M	M	Timer 0 event high
36	R	R	R	R	R	R	R	R	Timer 0 counter low
37	R	R	R	R	R	R	R	R	Timer 0 counter high
38	M	X	X	X	X	M	W	M	Timer 1 control
39	X	X	X	X	M	X	X	X	Timer 1 control
3A	M	M	M	M	M	M	M	M	Timer 1 scalar low
3B	M	M	M	M	M	M	M	M	Timer 1 scalar high
3C	M	M	M	M	M	M	M	M	Timer 1 duty low
3D	M	M	M	M	M	M	M	M	Timer 1 duty high
3E	R	R	R	R	R	R	R	R	Timer 1 counter low
3F	R	R	R	R	R	R	R	R	Timer 1 counter high
40	0	0	0	0	0	0	W	M	256Hz Counter control
41	R	R	R	R	R	R	R	R	256Hz Counter
42	X	X	X	X	X	X	X	X	Unknown
43	X	X	X	X	X	X	X	X	Unknown
44	X	X	X	X	X	X	X	X	Unknown
45	X	X	X	X	X	X	X	X	Unknown
46	X	X	X	X	X	X	X	X	Unknown
47	X	X	X	X	X	X	X	X	Unknown
48	M	X	X	X	X	M	W	M	Audio Timer 2 control
49	X	X	X	X	M	X	X	X	Audio Timer 2 control
4A	M	M	M	M	M	M	M	M	Audio Timer 2 scalar low
4B	M	M	M	M	M	M	M	M	Audio Timer 2 scalar high
4C	M	M	M	M	M	M	M	M	Audio Timer 2 duty low
4D	M	M	M	M	M	M	M	M	Audio Timer 2 duty high
4E	R	R	R	R	R	R	R	R	Audio Timer 2 counter low
4F	R	R	R	R	R	R	R	R	Audio Timer 2 counter high
50	X	X	X	X	X	X	X	X	Unknown
51	X	X	X	X	X	X	X	X	Unknown
52	R	R	R	R	R	R	R	R	Key-pad
53	X	X	X	X	X	X	X	X	Unknown
54	X	X	X	X	X	X	X	X	Unknown
55	X	X	X	X	X	X	X	X	Unknown
56	X	X	X	X	X	X	X	X	Unknown
57	X	X	X	X	X	X	X	X	Unknown
58	X	X	X	X	X	X	X	X	Unknown
59	X	X	X	X	X	X	X	X	Unknown
5A	X	X	X	X	X	X	X	X	Unknown
5B	X	X	X	X	X	X	X	X	Unknown
5C	X	X	X	X	X	X	X	X	Unknown
5D	X	X	X	X	X	X	X	X	Unknown
5E	X	X	X	X	X	X	X	X	Unknown
5F	X	X	X	X	X	X	X	X	Unknown
60	M	M	M	M	M	M	M	M	External Hardware access
61	M	M	M	M	M	M	M	M	External Hardware access
62	X	X	X	X	X	X	X	X	Unknown
63	X	X	X	X	X	X	X	X	Unknown
64	X	X	X	X	X	X	X	X	Unknown
65	X	X	X	X	X	X	X	X	Unknown
66	X	X	X	X	X	X	X	X	Unknown
67	X	X	X	X	X	X	X	X	Unknown
68	X	X	X	X	X	X	X	X	Unknown
69	X	X	X	X	X	X	X	X	Unknown
6A	X	X	X	X	X	X	X	X	Unknown
6B	X	X	X	X	X	X	X	X	Unknown
6C	X	X	X	X	X	X	X	X	Unknown
6D	X	X	X	X	X	X	X	X	Unknown
6E	X	X	X	X	X	X	X	X	Unknown
6F	X	X	X	X	X	X	X	X	Unknown
70	0	0	0	0	0	M	M	M	Audio volume 0 (?)
71	0	0	0	0	0	M	M	M	Audio volume 1
72	X	X	X	X	X	X	X	X	Unknown
73	X	X	X	X	X	X	X	X	Unknown
74	X	X	X	X	X	X	X	X	Unknown
75	X	X	X	X	X	X	X	X	Unknown
76	X	X	X	X	X	X	X	X	Unknown
77	X	X	X	X	X	X	X	X	Unknown
78	X	X	X	X	X	X	X	X	Unknown
79	X	X	X	X	X	X	X	X	Unknown
7A	X	X	X	X	X	X	X	X	Unknown
7B	X	X	X	X	X	X	X	X	Unknown
7C	X	X	X	X	X	X	X	X	Unknown
7D	X	X	X	X	X	X	X	X	Unknown
7E	X	X	X	X	X	X	X	X	Unknown
7F	X	X	X	X	X	X	X	X	Unknown
80	0	0	M	M	M	M	M	M	LCD Control
81	R	R	R	R	M	M	M	M	LCD Control
82	M	M	M	M	M	0	0	0	Map tile base address (low)
83	M	M	M	M	M	M	M	M	Map tile base address (mid)
84	0	0	0	M	M	M	M	M	Map tile base address (high)
85	0	M	M	M	M	M	M	M	Map Y Scroll
86	0	M	M	M	M	M	M	M	Map X Scroll
87	M	M	0	0	0	0	0	0	Sprite tile base address (low)
88	M	M	M	M	M	M	M	M	Sprite tile base address (mid)
89	0	0	0	M	M	M	M	M	Sprite tile base address (high)
8A	X	X	X	X	X	X	X	X	Unknown
8B	X	X	X	X	X	X	X	X	Unknown
8C	X	X	X	X	X	X	X	X	Unknown
8D	X	X	X	X	X	X	X	X	Unknown
8E	X	X	X	X	X	X	X	X	Unknown
8F	X	X	X	X	X	X	X	X	Unknown
90	X	X	X	X	X	X	X	X	Unknown
91	X	X	X	X	X	X	X	X	Unknown
92	X	X	X	X	X	X	X	X	Unknown
93	X	X	X	X	X	X	X	X	Unknown
94	X	X	X	X	X	X	X	X	Unknown
95	X	X	X	X	X	X	X	X	Unknown
96	X	X	X	X	X	X	X	X	Unknown
97	X	X	X	X	X	X	X	X	Unknown
98	X	X	X	X	X	X	X	X	Unknown
99	X	X	X	X	X	X	X	X	Unknown
9A	X	X	X	X	X	X	X	X	Unknown
9B	X	X	X	X	X	X	X	X	Unknown
9C	X	X	X	X	X	X	X	X	Unknown
9D	X	X	X	X	X	X	X	X	Unknown
9E	X	X	X	X	X	X	X	X	Unknown
9F	X	X	X	X	X	X	X	X	Unknown
A0	X	X	X	X	X	X	X	X	Unknown
A1	X	X	X	X	X	X	X	X	Unknown
A2	X	X	X	X	X	X	X	X	Unknown
A3	X	X	X	X	X	X	X	X	Unknown
A4	X	X	X	X	X	X	X	X	Unknown
A5	X	X	X	X	X	X	X	X	Unknown
A6	X	X	X	X	X	X	X	X	Unknown
A7	X	X	X	X	X	X	X	X	Unknown
A8	X	X	X	X	X	X	X	X	Unknown
A9	X	X	X	X	X	X	X	X	Unknown
AA	X	X	X	X	X	X	X	X	Unknown
AB	X	X	X	X	X	X	X	X	Unknown
AC	X	X	X	X	X	X	X	X	Unknown
AD	X	X	X	X	X	X	X	X	Unknown
AE	X	X	X	X	X	X	X	X	Unknown
AF	X	X	X	X	X	X	X	X	Unknown
B0	X	X	X	X	X	X	X	X	Unknown
B1	X	X	X	X	X	X	X	X	Unknown
B2	X	X	X	X	X	X	X	X	Unknown
B3	X	X	X	X	X	X	X	X	Unknown
B4	X	X	X	X	X	X	X	X	Unknown
B5	X	X	X	X	X	X	X	X	Unknown
B6	X	X	X	X	X	X	X	X	Unknown
B7	X	X	X	X	X	X	X	X	Unknown
B8	X	X	X	X	X	X	X	X	Unknown
B9	X	X	X	X	X	X	X	X	Unknown
BA	X	X	X	X	X	X	X	X	Unknown
BB	X	X	X	X	X	X	X	X	Unknown
BC	X	X	X	X	X	X	X	X	Unknown
BD	X	X	X	X	X	X	X	X	Unknown
BE	X	X	X	X	X	X	X	X	Unknown
BF	X	X	X	X	X	X	X	X	Unknown
C0	X	X	X	X	X	X	X	X	Unknown
C1	X	X	X	X	X	X	X	X	Unknown
C2	X	X	X	X	X	X	X	X	Unknown
C3	X	X	X	X	X	X	X	X	Unknown
C4	X	X	X	X	X	X	X	X	Unknown
C5	X	X	X	X	X	X	X	X	Unknown
C6	X	X	X	X	X	X	X	X	Unknown
C7	X	X	X	X	X	X	X	X	Unknown
C8	X	X	X	X	X	X	X	X	Unknown
C9	X	X	X	X	X	X	X	X	Unknown
CA	X	X	X	X	X	X	X	X	Unknown
CB	X	X	X	X	X	X	X	X	Unknown
CC	X	X	X	X	X	X	X	X	Unknown
CD	X	X	X	X	X	X	X	X	Unknown
CE	X	X	X	X	X	X	X	X	Unknown
CF	X	X	X	X	X	X	X	X	Unknown
D0	X	X	X	X	X	X	X	X	Unknown
D1	X	X	X	X	X	X	X	X	Unknown
D2	X	X	X	X	X	X	X	X	Unknown
D3	X	X	X	X	X	X	X	X	Unknown
D4	X	X	X	X	X	X	X	X	Unknown
D5	X	X	X	X	X	X	X	X	Unknown
D6	X	X	X	X	X	X	X	X	Unknown
D7	X	X	X	X	X	X	X	X	Unknown
D8	X	X	X	X	X	X	X	X	Unknown
D9	X	X	X	X	X	X	X	X	Unknown
DA	X	X	X	X	X	X	X	X	Unknown
DB	X	X	X	X	X	X	X	X	Unknown
DC	X	X	X	X	X	X	X	X	Unknown
DD	X	X	X	X	X	X	X	X	Unknown
DE	X	X	X	X	X	X	X	X	Unknown
DF	X	X	X	X	X	X	X	X	Unknown
E0	X	X	X	X	X	X	X	X	Unknown
E1	X	X	X	X	X	X	X	X	Unknown
E2	X	X	X	X	X	X	X	X	Unknown
E3	X	X	X	X	X	X	X	X	Unknown
E4	X	X	X	X	X	X	X	X	Unknown
E5	X	X	X	X	X	X	X	X	Unknown
E6	X	X	X	X	X	X	X	X	Unknown
E7	X	X	X	X	X	X	X	X	Unknown
E8	X	X	X	X	X	X	X	X	Unknown
E9	X	X	X	X	X	X	X	X	Unknown
EA	X	X	X	X	X	X	X	X	Unknown
EB	X	X	X	X	X	X	X	X	Unknown
EC	X	X	X	X	X	X	X	X	Unknown
ED	X	X	X	X	X	X	X	X	Unknown
EE	X	X	X	X	X	X	X	X	Unknown
EF	X	X	X	X	X	X	X	X	Unknown
F0	X	X	X	X	X	X	X	X	Unknown
F1	X	X	X	X	X	X	X	X	Unknown
F2	X	X	X	X	X	X	X	X	Unknown
F3	X	X	X	X	X	X	X	X	Unknown
F4	X	X	X	X	X	X	X	X	Unknown
F5	X	X	X	X	X	X	X	X	Unknown
F6	X	X	X	X	X	X	X	X	Unknown
F7	X	X	X	X	X	X	X	X	Unknown
F8	X	X	X	X	X	X	X	X	Unknown
F9	X	X	X	X	X	X	X	X	Unknown
FA	X	X	X	X	X	X	X	X	Unknown
FB	X	X	X	X	X	X	X	X	Unknown
FC	X	X	X	X	X	X	X	X	Unknown
FD	X	X	X	X	X	X	X	X	Unknown
FE	M	M	M	M	M	M	M	M	LCD Control Data / Address
FF	M	M	M	M	M	M	M	M	LCD Control Data

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