41CL User Manual
© 2019, Systemyde International Corporation
2
Every effort has been made to ensure the accuracy of the information contained herein. If you find errors or
inconsistencies please bring them to our attention.
Copyright © 2013-2019, Systemyde International Corporation. All rights reserved.
Notice:
“
HP
-
41C”
,
“
HP
-
41CV”
,
“
HP
-
41CX”
a
nd
“
HP”
a
r
e
r
e
gi
s
t
e
r
e
d
t
r
a
de
ma
r
ks
of
He
wl
e
t
t
-Packard, Inc. All uses
of these terms in this document are to be construed as adjectives, whether or not the n
oun
“
c
a
l
c
ul
a
t
or
”
,
“
CPU”
or
“
de
vi
c
e”
a
r
e
a
c
t
ua
l
l
y
pr
e
s
e
nt
.
Acknowledgements:
This project never could have succeeded without
Warren Furlow
’
s
e
xc
e
l
l
e
nt
We
b
s
i
t
e
hp41.
or
g.
And
e
ve
n
more important was his SDK41R6 software suite, for code development, and his V41 program for code
debugging. Numerous people have answered my dumb questions on the Web site hpmuseum.org, and the
book
“
I
ns
i
de
t
he
HP
-
41”
by
Jean-Daniel Dodin
was invaluable for getting a foothold on understanding the
HP-41 operating system and register usage.
Gene Wright
was kind enough to be my voice at the HHC 2010 conference.
‘
Ange
l
Mar
t
i
n
contributed valuable 41CL-specific software to the project.
Eric Rechlin
made the labels for the front of the calculator.
Nate Martin
modified his Port cover 3-D model specially for use with the serial port jack.
Benoit Maag
provided the photograph of the different connector types.
Geoff Quickfall
provided the photographs of the older display driver and corresponding capacitor fix.