| Type, Precision, Input
mode |
Scientific, 10 BCD digits, exponent
±99, Reverse Polish Notation |
| Programmable |
Yes
|
| Performance
Index |
34 - the original HP-15C reached 2.7
|
| CPU & Memory |
LPC1114 ARM CPU emulates the NUT processor.
Permanent memory. |
| Display |
132x16 pixel dot matix LCD display |
| Special features |
Mini-USB connector for external access,
eg operating software update.
|
| Original Pricing,
Production |
Produced and sold by SwissMicros. (Michael Steinmann), 126 Euro in 2015, includes shipping from Switzerland
|
| Batteries |
One button size cell. To replace the batteries
unscrew the back of the unit.
|
| Dimensions |
Length 12.9cm, Width 7.9cm, Height 1.4cm |
| Links |
rpn-calc by
Michael Steinmann. SwissMicros.com, see there for firmware updates.
For manuals see HP-15C. See also DM-41 and DM-15CC.
|
| Forensic Result | 9.000417403
- identical to the classic HP-15C. This is to be expected since the
processor emulates the original CPU and presumably uses large parts of
the original ROM code. |
| Comment |
See the HP-15C
for a list of exciting news on the 15C.
What
a cool device! The unit has the same size as the original HP-15C and
even its keys can be considered as good as the original HP keys!
|
| Key Combinations |
Turn off calculator, press and hold the
function key, press ON briefly, release the function key.
| Function key |
Action |
| B |
Benchmark, returns a value close to 30 indicating that
the unit is almost 30 times faster than the original HP-15C. As with
the DM-15CC this is not consistent with my performance index
measurements.
|
| C |
Turn on serial console |
| 7 |
Toggle between 7-segment font and smooth font |
| / |
Key test, same as on original 15C - doesn't quite
work! |
| * |
Self test, same as on original 15C |
| - |
Reset, same as on original 15C |
| + |
Self test, same as on original 15C |
| , |
Switch between comma and dot for fraction
delimiter |
| E |
Shows the firmware version: "DM15 M1B V16 48MHz" |
|
| Software Update |
There is a number of different firmware
versions available on the rpn-calc / SwissMicros site.
For programming details see DM-41.
Note: If the unit seems dead after programming briefly remove the battery (unscrew back lid). |
|
Program used to determine the performance index for the DM-15CC, DM-15L, HP-15C LE and HP-15C Classic:
001
LBL A
002 10
004 STO 0
005 LBL 1
006 1
007 +
008 4.567E-4
016 -
017 70
019 +
020 69
022 -
023 7
024 x
025 11
027 /
028 RCL 0
029 1
030 -
031 STO 0
032 x<>0? (TEST 0)
033 GTO 1
034 Rv
035 log
036 sin
037 sqrt
038 sqrt
039 RTN
|
Wrapper
with count in reg 3:
040 LBL B
041 GSB A
042 RCL 3
043 1
044 -
045 STO 3
046 x<>0? (TEST 0)
047 GTO B
048 RTN
|
With 20 loops
specified in register 3 the program runs for 19.8 seconds.
The performance index calculates to 34 * 20 / 19.8 = 34.3
|
|
