AMSTRAD CPC SCREEN HELP - WORKED OUT BY N.W.C. 4-7-1987.
--------------------------------------------------------------------------------
NORMAL SCREEN START : &C000/49152
NORMAL SCREEN END : &FFCF/65487

MODE 0:
SCREEN BYTE: PIXEL A, PIXEL B
PIXEL A: BIT 7 5 3 1
PIXEL B: BIT 6 4 2 0

BIT PEN VALUE BYTE VALUE PIXEL
0 8 1 B
1 8 2 A
2 2 4 B
3 2 8 A
4 4 16 B
5 4 32 A
6 1 64 B
7 1 128 A

--------------------------------------------------------------------------------
PIXEL A: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
********************************************************************************
PIXEL B *
0 * 0 128 8 136 32 160 40 168 2 130 10 138 34 162 42 170
1 * 64 192 72 200 96 224 104 232 66 194 74 202 98 226 106 234
2 * 4 132 12 140 36 164 44 172 6 134 14 142 38 166 46 174
3 * 68 196 76 204 100 228 108 236 70 198 78 206 102 230 110 238
4 * 16 144 24 152 48 176 56 184 18 146 26 154 50 178 58 186
5 * 80 208 88 216 112 240 120 248 82 210 90 218 114 242 122 250
6 * 20 148 28 156 52 180 60 188 22 150 30 158 54 182 62 190
7 * 84 212 92 220 116 244 124 252 86 214 94 222 118 246 126 254
8 * 1 129 9 137 33 161 41 169 3 131 11 139 35 163 43 171
9 * 65 193 73 201 97 225 105 233 67 195 75 203 99 227 107 235
10 * 5 133 13 141 37 165 45 173 7 135 15 143 39 167 47 175
11 * 69 197 77 205 101 229 109 237 71 199 79 207 103 231 111 239
12 * 17 145 25 153 49 177 57 185 19 147 27 155 51 179 59 187
13 * 81 209 89 217 113 241 121 249 83 211 91 219 115 243 123 251
14 * 21 149 29 157 53 181 61 189 23 151 31 159 55 183 63 191
15 * 85 213 93 221 117 245 125 253 87 215 95 223 119 247 127 255
*
********************************************************************************

MODE 1:
SCREEN BYTE: PIXEL A, PIXEL B, PIXEL C, PIXEL D
PIXEL A: BIT 7 3
PIXEL B: BIT 6 2
PIXEL C: BIT 5 1
PIXEL D: BIT 4 0

BIT PEN VALUE BYTE VALUE PIXEL
0 2 1 D
1 2 2 C
2 2 4 B
3 2 8 A
4 1 16 D
5 1 32 C
6 1 64 B
7 1 128 A

MODE 2:
SCREEN BYTE: PIXEL A,B,C,D,E,F,G,H
PIXEL A: BIT 7
PIXEL B: BIT 6
PIXEL C: BIT 5
PIXEL D: BIT 4
PIXEL E: BIT 3
PIXEL F: BIT 2
PIXEL G: BIT 1
PIXEL H: BIT 0
PEN VALUE: PEN 0=BIT RESET/PEN 1=BIT SET