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robve · 06-12-2024, 08:48 PM

Results for the SHARP PC-1421 on an emulator (PockEmul). I trust the emulator is identical to the real metal, because it uses the original ROM with an emulated CPU.

Oof, this is interesting. It's not as good as the SHARP EL-735 results (1 1b 2 3 8 12) and even has some buggy output (4 5 6 11). Note that result 9 is the same as my SHARP program result. These test cases aren't vanilla TVM, but still disappointing and shows that rate solvers aren't created the same.

Code:

| #  | Ref        | N            | I%YR      | PV       | PMT          | FV        | P/YR | End |

|----|------------|--------------|-----------|----------|--------------|-----------|------|-----|

| 1  | DM         | 38 x 12      | 5.25%     | 270'000  | ?            | 0         | 12   | yes |

Sharp PC-1421 PMT=-1368.148355

| 1b | DM         | 38 x 12      | ?         | 270'000  | -14'584/12   | 0         | 12   | yes |

Sharp PC-1421 I%YR=4.373218366

| 2  | SlideRule  | 360          | 15% → 12% | 100'000  | ?-?          | 0         | 12   | yes |

Sharp PC-1421 -1264.444022 - -1028,612597 = -235.8314251 => PV=6803.092175 

| 3  | Kahan 1983 | 60x60x24x365 | 10%       | 0        | -0.01        | ?         | =N   | yes |

Sharp PC-1421 FV=331559.3833

| 4  | DM         | 480          | 0 → ?     | 100'000  | ?→ PMT       | 0         | 12   | yes |

Sharp PC-1421 I%YR=ERR

| 5  | Dieter     | 10           | ?         | 50       | -30          | 400       | 1    | yes |

Sharp PC-1421 I%=14.43587133

| 6  | Dieter     | 10           | ?         | 50       | -30          | 80        | 1    | yes |

Sharp PC-1421 I%=58.46195527

| 7  | A Chan     | 10           | ?         | -100     | 10           | 1e-10     | 12   | yes |

Sharp PC-1421 I%YR=0

| 8  | Miguel     | 32           | ?         | -999'999 | 0            | 1e6       | 1    | yes |

Sharp PC-1421 I%YR=3.124E-06

| 9  | DM         | ?            | 25        | 100000   | -2083.333334 | 0         | 12   | yes |

Sharp PC-1421 N=1040.639029

| 10 | DM         | ?            | 25        | 100000   | -2040.816327 | 0         | 12   | no  |

Sharp PC-1421 N=1051.968948

| 11 | robve      | 60x24x365    | 1/6% → ?  | 0        | -0.01        | ?→ FV     | =N   | yes |

Sharp PC-1421 FV=5258.756614 => I%=1.073741824E+09 !!!

| 12 | robve      | 40           | ? → I%YR  | 900      | -400         | -1000 → ? | 1    | no  |

Sharp PC-1421 I%=80 => FV=-975.1051597

- Rob