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===== Display details =====

To be honnest, even I do not know, nor care about these details (Cyrille). Don't bother about this and just download the graphics.cpp file in the HP sdk where you will find 4 functions:

DrawGraphic (draws a 43*6 graphics in the dot matrix area)

DrawText (displays text in the 43*6 graphics in the dot matrix area)

DrawNumber (displays numbers in the number area).


(Someone else needs to double check this.)

==== "Hardwired" display indicators (non-changeable) ====

^Segment ^Address ^Value ^
|Big equals |0xfffb420c |0x80 |
|360 | 0xfffb4214 |0x80 | 
|RPN | 0xfffb4214 |0x40 |
|RAD | 0xfffb421c |0x80 |
|RCL | 0xfffb4224 |0x80 |
|STO | 0xfffb422c |0x80 |
|BEG | 0xfffb4234 |0x80 |
|Battery symbol | 0xfffb423c |0x80 |
|Tiny equals | 0xfffb4244 |0x80 |
|Input | 0xfffb424c | 0x80 |
|Shift | 0xfffb4204 | 0x80 |

==== Programmable LCD segments ====

Here's what I worked up on the main digit and exponent area.

^Digit      ^Segment           ^Address                 ^Value ^
|(leading negative)      |c                 |0xfffb4228              |0x40 |
| 0                       | a               | 0xfffb4210            | 0x80 |
| 0                       | b               | 0xfffb4210            | 0x40 |
| 0                       | c               | 0xfffb4218            | 0x80 |
| 0                       | d               | 0xfffb4210            | 0x100 |
| 0                       | e               | 0xfffb4218            | 0x40 |
| 0                       | f               | 0xfffb4220            | 0x40 |
| 0                       | g               | 0xfffb4220            | 0x80 |
| 0                       | h               | 0xfffb4228            | 0x100 |
| 0                       | i               | 0xfffb4228            | 0x80 |
| 1                       | a               | 0xfffb4210            | 0x200 |
| 1                       | b               | 0xfffb4218            | 0x100 |
| 1                       | c               | 0xfffb4218            | 0x200 |
| 1                       | d               | 0xfffb4218            | 0x400 |
| 1                       | e               | 0xfffb4220            | 0x100 |
| 1                       | f               | 0xfffb4220            | 0x200 |
| 1                       | g               | 0xfffb4220            | 0x400 |
| 1                       | h               | 0xfffb4228            | 0x400 |
| 1                       | i               | 0xfffb4228            | 0x200 |
| 2                       | a               | 0xfffb4210            | 0x800 |
| 2                       | b               | 0xfffb4210            | 0x400 |
| 2                       | c               | 0xfffb4218            | 0x800 |
| 2                       | d               | 0xfffb4210            | 0x1000 |
| 2                       | e               | 0xfffb4220            | 0x800 |
| 2                       | f               | 0xfffb4228            | 0x800 |
| 2                       | g               | 0xfffb4218            | 0x1000 |
| 2                       | h               | 0xfffb4220            | 0x1000 |
| 2                       | i               | 0xfffb4228            | 0x1000 |
| 3                       | a               | 0xfffb4210            | 0x4000 |
| 3                       | b               | 0xfffb4210            | 0x2000 |
| 3                       | c               | 0xfffb4218            | 0x2000 |
| 3                       | d               | 0xfffb4218            | 0x4000 |
| 3                       | e               | 0xfffb4220            | 0x2000 |
| 3                       | f               | 0xfffb4228            | 0x2000 |
| 3                       | g               | 0xfffb4220            | 0x4000 |
| 3                       | h               | 0xfffb4220            | 0x8000 |
| 3                       | i               | 0xfffb4228            | 0x4000 |
| 4                       | a               | 0xfffb4210            | 0x10000 |
| 4                       | b               | 0xfffb4210            | 0x8000 |
| 4                       | c               | 0xfffb4218            | 0x10000 |
| 4                       | d               | 0xfffb4210            | 0x20000 |
| 4                       | e               | 0xfffb4218            | 0x8000 |
| 4                       | f               | 0xfffb4228            | 0x8000 |
| 4                       | g               | 0xfffb4220            | 0x10000 |
| 4                       | h               | 0xfffb4228            | 0x20000 |
| 4                       | i               | 0xfffb4228            | 0x10000 |
| 5                       | a               | 0xfffb4210            | 0x40000 |
| 5                       | b               | 0xfffb4218            | 0x20000 |
| 5                       | c               | 0xfffb4218            | 0x40000 |
| 5                       | d               | 0xfffb4218            | 0x80000 |
| 5                       | e               | 0xfffb4220            | 0x20000 |
| 5                       | f               | 0xfffb4220            | 0x40000 |
| 5                       | g               | 0xfffb4220            | 0x80000 |
| 5                       | h               | 0xfffb4228            | 0x80000 |
| 5                       | i               | 0xfffb4228            | 0x40000 |
| 6                       | a               | 0xfffb4210            | 0x100000 |
| 6                       | b               | 0xfffb4210            | 0x80000 |
| 6                       | c               | 0xfffb4218            | 0x100000 |
| 6                       | d               | 0xfffb4210            | 0x200000 |
| 6                       | e               | 0xfffb4220            | 0x100000 |
| 6                       | f               | 0xfffb4228            | 0x100000 |
| 6                       | g               | 0xfffb4218            | 0x200000 |
| 6                       | h               | 0xfffb4220            | 0x200000 |
| 6                       | i               | 0xfffb4228            | 0x200000 |
| 7                       | a               | 0xfffb4210            | 0x800000 |
| 7                       | b               | 0xfffb4210            | 0x400000 |
| 7                       | c               | 0xfffb4218            | 0x400000 |
| 7                       | d               | 0xfffb4218            | 0x800000 |
| 7                       | e               | 0xfffb4220            | 0x400000 |
| 7                       | f               | 0xfffb4228            | 0x400000 |
| 7                       | g               | 0xfffb4220            | 0x800000 |
| 7                       | h               | 0xfffb4220            | 0x1000000 |
| 7                       | i               | 0xfffb4228            | 0x800000 |
| 8                       | a               | 0xfffb4210            | 0x2000000 |
| 8                       | b               | 0xfffb4210            | 0x1000000 |
| 8                       | c               | 0xfffb4218            | 0x2000000 |
| 8                       | d               | 0xfffb4210            | 0x4000000 |
| 8                       | e               | 0xfffb4218            | 0x1000000 |
| 8                       | f               | 0xfffb4228            | 0x1000000 |
| 8                       | g               | 0xfffb4220            | 0x2000000 |
| 8                       | h               | 0xfffb4228            | 0x4000000 |
| 8                       | i               | 0xfffb4228            | 0x2000000 |
| 9                       | a               | 0xfffb4210            | 0x8000000 |
| 9                       | b               | 0xfffb4218            | 0x4000000 |
| 9                       | c               | 0xfffb4218            | 0x8000000 |
| 9                       | d               | 0xfffb4218            | 0x10000000 |
| 9                       | e               | 0xfffb4220            | 0x4000000 |
| 9                       | f               | 0xfffb4220            | 0x8000000 |
| 9                       | g               | 0xfffb4220            | 0x10000000 |
| 9                       | h               | 0xfffb4228            | 0x10000000 |
| 9                       | i               | 0xfffb4228            | 0x8000000 |
| 10                      | a               | 0xfffb4210            | 0x20000000 |
| 10                      | b               | 0xfffb4210            | 0x10000000 |
| 10                      | c               | 0xfffb4218            | 0x20000000 |
| 10                      | d               | 0xfffb4210            | 0x40000000 |
| 10                      | e               | 0xfffb4220            | 0x20000000 |
| 10                      | f               | 0xfffb4228            | 0x20000000 |
| 10                      | g               | 0xfffb4218            | 0x40000000 |
| 10                      | h               | 0xfffb4220            | 0x40000000 |
| 10                      | i               | 0xfffb4228            | 0x40000000 |
| 11                      | a               | 0xfffb4214            | 0x1 |
| 11                      | b               | 0xfffb4210            | 0x80000000 |
| 11                      | c               | 0xfffb4218            | 0x80000000 |
| 11                      | d               | 0xfffb421c            | 0x1 |
| 11                      | e               | 0xfffb4220            | 0x80000000 |
| 11                      | f               | 0xfffb4228            | 0x80000000 |
| 11                      | g               | 0xfffb4224            | 0x1 |
| 11                      | h               | 0xfffb422c            | 0x2 |
| 11                      | i               | 0xfffb421c            | 0x1 |
|negative exponent        | (-)             | 0xfffb421c            | 0x2 |
| 12                      | a               | 0xfffb4214            | 0x4 |
| 12                      | b               | 0xfffb4214            | 0x2 |
| 12                      | c               | 0xfffb4224            | 0x4 |
| 12                      | d               | 0xfffb421c            | 0x4 |
| 12                      | e               | 0xfffb4224            | 0x2 |
| 12                      | f               | 0xfffb422c            | 0x4 |
| 12                      | g               | 0xfffb422c            | 0x8 |
| 13                      | a               | 0xfffb4214            | 0x10 |
| 13                      | b               | 0xfffb4214            | 0x8 |
| 13                      | c               | 0xfffb421c            | 0x8 |
| 13                      | d               | 0xfffb421c            | 0x10 |
| 13                      | e               | 0xfffb4224            | 0x8 |
| 13                      | f               | 0xfffb422c            | 0x10 |
| 13                      | g               | 0xfffb4224            | 0x10 |
| 14                      | a               | 0xfffb421c            | 0x40 |
| 14                      | b               | 0xfffb4214            | 0x20 |
| 14                      | c               | 0xfffb421c            | 0x20 |
| 14                      | d               | 0xfffb4224            | 0x40 |
| 14                      | e               | 0xfffb4224            | 0x20 |
| 14                      | f               | 0xfffb422c            | 0x20 |
| 14                      | g               | 0xfffb422c            | 0x40 |

Digit zero at the left.  Digits 12, 13, and 14 are the small exponent digits.

==== Individual LCD character segment legend ====

^Segment ^Position ^
|a |Top center horizontal |
|b |Top left vertical |
|c |Center horizontal |
|d |Top right vertical |
|e |Bottom left vertical |
|f |Bottom center horizontal |
|g |Bottom right vertical |
|h |Decimal point |
|i |Comma |

==== Contrast control ====

LCD contrast seems to be controlled by the low 4 bits of SUPV_MR (0xfffffd18).
Be sure that you write the access key to the high byte so that changes to
SUPV_MR will be accepted.
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