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HP-15C Memory Allocation
There are 67 data registers (0-65 and the Index register) in the HP-15C. You can store seven program instructions per register. By selecting how many registers to reserve for data storage, you can define how many program instructions are available. Use the following table to determine your needs and allocate the HP-15C memory.
| Register | Data | Program | Allocation |
| R(I) | |||
| R(0) | |||
| R(1) | 3 | 448 | 1 f DIM (i) |
| R(2) | 4 | 441 | 2 f DIM (i) |
| R(3) | 5 | 434 | 3 f DIM (i) |
| R(4) | 6 | 427 | 4 f DIM (i) |
| R(5) | 7 | 420 | 5 f DIM (i) |
| R(6) | 8 | 413 | 6 f DIM (i) |
| R(7) | 9 | 406 | 7 f DIM (i) |
| R(8) | 10 | 399 | 8 f DIM (i) |
| R(9) | 11 | 392 | 9 f DIM (i) |
| R(.0) | 12 | 385 | 10 f DIM (i) |
| R(.1) | 13 | 378 | 11 f DIM (i) |
| R(.2) | 14 | 371 | 12 f DIM (i) |
| R(.3) | 15 | 364 | 13 f DIM (i) |
| R(.4) | 16 | 357 | 14 f DIM (i) |
| R(.5) | 17 | 350 | 15 f DIM (i) |
| R(.6) | 18 | 343 | 16 f DIM (i) |
| R(.7) | 19 | 336 | 17 f DIM (i) |
| R(.8) | 20 | 329 | 18 f DIM (i) |
| R(.9) | 21 | 322 | 19 f DIM (i) |
| R(20) | 22 | 315 | 20 f DIM (i) |
| R(21) | 23 | 308 | 21 f DIM (i) |
| R(22) | 24 | 301 | 22 f DIM (i) |
| R(23) | 25 | 294 | 23 f DIM (i) |
| R(24) | 26 | 287 | 24 f DIM (i) |
| R(25) | 27 | 280 | 25 f DIM (i) |
| R(26) | 28 | 273 | 26 f DIM (i) |
| R(27) | 29 | 266 | 27 f DIM (i) |
| R(28) | 30 | 259 | 28 f DIM (i) |
| R(29) | 31 | 252 | 29 f DIM (i) |
| R(30) | 32 | 245 | 30 f DIM (i) |
| R(31) | 33 | 238 | 31 f DIM (i) |
| R(32) | 34 | 231 | 32 f DIM (i) |
| R(33) | 35 | 224 | 33 f DIM (i) |
| R(34) | 36 | 217 | 34 f DIM (i) |
| R(35) | 37 | 210 | 35 f DIM (i) |
| R(36) | 38 | 203 | 36 f DIM (i) |
| R(37) | 39 | 196 | 37 f DIM (i) |
| R(38) | 40 | 189 | 38 f DIM (i) |
| R(39) | 41 | 182 | 39 f DIM (i) |
| R(40) | 42 | 175 | 40 f DIM (i) |
| R(41) | 43 | 168 | 41 f DIM (i) |
| R(42) | 44 | 161 | 42 f DIM (i) |
| R(43) | 45 | 154 | 43 f DIM (i) |
| R(44) | 46 | 147 | 44 f DIM (i) |
| R(45) | 47 | 140 | 45 f DIM (i) |
| R(46) | 48 | 133 | 46 f DIM (i) |
| R(47) | 49 | 126 | 47 f DIM (i) |
| R(48) | 50 | 119 | 48 f DIM (i) |
| R(49) | 51 | 112 | 49 f DIM (i) |
| R(50) | 52 | 105 | 50 f DIM (i) |
| R(51) | 53 | 98 | 51 f DIM (i) |
| R(52) | 54 | 91 | 52 f DIM (i) |
| R(53) | 55 | 84 | 53 f DIM (i) |
| R(54) | 56 | 77 | 54 f DIM (i) |
| R(55) | 57 | 70 | 55 f DIM (i) |
| R(56) | 58 | 63 | 56 f DIM (i) |
| R(57) | 59 | 56 | 57 f DIM (i) |
| R(58) | 60 | 49 | 58 f DIM (i) |
| R(59) | 61 | 42 | 59 f DIM (i) |
| R(60) | 62 | 35 | 60 f DIM (i) |
| R(61) | 63 | 28 | 61 f DIM (i) |
| R(62) | 64 | 21 | 62 f DIM (i) |
| R(63) | 65 | 14 | 63 f DIM (i) |
| R(64) | 66 | 7 | 64 f DIM (i) |
| R(65) | 67 | 0 | 65 f DIM (i) |
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