Hello Raymond,
Here are a couple of excerpts from their README files:
From Calc/41 v. 3.02 README:
CALC41 Professional Scientific Calculator Software
Copyright (C) Eclipse Logic Inc., 1985-1988. All Rights Reserved
Copyright (C) Tacit Logic Systems Inc., 1989. All Rights Reserved
Ver 3.02
Tacit Logic Systems Inc.
P.O. Box 231178 • Tigard, Oregon 97223
Sales & Support 503/684-6088 • BBS 503/678-1040
(...)
Release 3.00 : 02/15/1989
Added GTO .--- function within the Program Editor.
During Editing, if R/S key is pressed STOP function is inserted.
Combined Both ELI-41 and ELI-41SX products into a single package
called Calc/41.
The Calc41.exe program supplied is same as the ELI-41SX program.
The Calc41P.exe program is the POP-UP program.
Added /B parameter to Calc41P.exe program to display on composite
monitors.
Instructions for running these programs are the same as the ones
provided in the manual, except for the POP-UP. The Calc41P is loaded
as a POP-UP by default. Another words there is no command line option
to make it a POP-Up.
(...)
From Trans41 v. 3.00 README.DOC:
Transfer/41: Programs & Data Upload/Download to/from HP-41 and PC
Version 3.00
Copyright (C) Tacit Logic Systems Inc., 1989. All Rights Reserved
Copyright (C) Eclipse Logic Inc., 1986-1988. All Rights Reserved
Tacit Logic Systems Inc.
P.O. Box 231178 • Tigard, Oregon 97223
Sales & Support 503/684-6088 • BBS 503/678-1040
(...)
Release 2.0 now supports the Global and Local labels used in the
Calc/41 Version 2.0 and up. The control character generated for Global labels is 'L'
and for Local labels is 'M'.
(...)
It is clear that they were from the same company; the products that evolved into Calc/41 were ELI-41 and ELI-41SX.
I don't own any of these but from the PCMag review of ELI-41 2.20 I can see that Calc/41 retains the same interface.
These are the contents of the Calc/41 floppy:
12/06/1988 22:16 51 TONE5.PGM
12/06/1988 22:16 1.536 ROOTS.PGM
12/06/1988 22:16 196 STORE.PGM
12/06/1988 22:16 51 TONE8.PGM
12/06/1988 22:16 794 AREA.CNV
12/06/1988 22:16 357 LENGTH.CNV
12/06/1988 22:16 292 POWER.CNV
12/06/1988 22:16 191 VOLUME.CNV
12/06/1988 22:16 42 TONE9.PGM
12/06/1988 22:16 51 TONE6.PGM
12/06/1988 22:16 51 TONE7.PGM
12/06/1988 22:16 51 TONE4.PGM
12/06/1988 22:16 51 TONE1.PGM
12/06/1988 22:16 51 TONE2.PGM
12/06/1988 22:16 253 FAR2CE.PGM
12/06/1988 22:16 51 TONE3.PGM
12/06/1988 22:16 50 XEQTEST.PGM
22/07/1988 10:29 63 AUTOEND
24/10/1988 12:53 237 EVENS.PGM
24/10/1988 12:54 81 GTOTEST.PGM
24/10/1988 12:54 743 MARY.PGM
24/10/1988 12:55 89 TAX.PGM
24/10/1988 12:57 61 CONV.PGM
25/10/1988 13:12 22.400 QEDITINS.EXE
26/10/1988 23:33 3.646 LST2PGM.DOC
08/01/1989 13:48 23.904 QEDIT.EXE
11/02/1989 10:13 19.349 LST2PGM.EXE
20/02/1989 09:57 1.535 INSTALL.BAT
20/02/1989 10:24 62 TRANSFER.PGM
20/02/1989 10:25 69 AUTORUN
18/06/1989 11:03 81.536 CALC41P.EXE
20/08/1989 15:49 166.197 CALC41.EXE
20/08/1989 15:53 5.330 README
33 File 329.421 byte
HTH,
Massimo