|Unabashed HP 41CL promotion (with pictures)!|
Message #1 Posted by Geoff Quickfall on 15 June 2011, 6:12 p.m.
What a facinating project Monte has undertaken. The board is working flawlessly for me.
Currently it is configured with my resident programs for work complete with key assignments.
Also I have physically inserted the following:
- port 1 serial connector which leaves port 1
- port 2 Diego Diaz's Clonix
- port 3 time module
- port 4 reserved for IR printer, HPIL, laser wand, card reader.
Virtually installed are the following:
- port one lower the HP41CL suite of commands including plug and
uplug, turbo and etc
- port two Clonix with CCD, PPC, NAVB1 (all removable and
interchangeable with the pic programmer and Diego's instructions.
- port three with MATH and ADVANTAGE roms
- port four with STAT and TREK roms
The turbo mode* runs my WPA (way point data) routine in 7 seconds including prompted key inputs giving Great Circle and true track. This is fast as the program relies on a data base of airport codes attached to Lat and Lon co-ordinates. So not only calculating the GC distance and track but scanning the extended memory for the prompted for airport three letter code (Vancouver YVR) and converting lat and lon alpha into numeric.
Contrast with 30 seconds without turbo50 mode!
Well enough said, with the addition of a couple of small programs in memory to assist in plugging and unplugging the roms this is one of the most incredible scientific calculators today.
The calculator I chose is a tall keys (actually steeper front) with an early serial number (yep, Gene, not as early as Richards!) but still. It had a defunct board which I have yet to trouble shoot. The case and keys were perfect. No cracked screw posts or shell. All keys with an incredible HP snap. Crisp clear LCD panel. The presence of power supply contact balls.
So the completed project, with a capacitor modification due to the LCD driver revision.
The pristine OLD NEW **HP 41CL**
The early serial number 1933A...
The port configuration with the serial connector beside clonix:
The external contact balls/springs/clip (see The CL conversion of an early HP 41C )
*There is a note in Monte's manual that the turbo mode does affect power drain and shortens battery life. That is another reason I selected this calculator as it has the power supply ball contacts. With a modified TV cord which I will put together soon I can attach this to an external power supply if required. This is mentioned in the annals of history 'HPNotes'. So having the external power supply ball contacts makes life easier if you are in an office. In fact, wiring the cord to a large lantern alkaline 6 volt battery would suffice.
Also, you will need a time module for the calculator as the 41CL board does not have a quartz crystal. Of course this is required on the C and CV version but also on a converted CX to CL as the CL board contains the timing functions but not the running clock.
Enjoy and if you are an HP 41C, CV, CX you must have one of these CL's. This is now back in the cockpit as it is as fast as the 42S in turbo50 mode!
Edited: 15 June 2011, 6:38 p.m.