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An extract from A Handheld Calculator (HHC) Program for Thermal Imaging Target Acquisition Analysis, US Army (ER&D CC), DELNV-TR-0030, JAN 1982, 43 pgs.

ABSTRACT
… This report describes one of several activities of NV&EOL to disseminate analysis capability to a broad spectrum of Army elements so that each may undertake independently routine FLIR performance calculations as required. Although these analytical models are incorporated entirely within a handheld calculator (HHC) and designed for simplicity in their use. they provide a comprehensive performance analysis capability. This capability stems from unique analytical fits to higher level models and from the remarkable capacity of the new HP 41CV programmable handheld calculator. This report provides a complete user's guide in the application of HHC programs to FLIR analysis problems for requirements frequently encountered by FLIR and weapon platform designers, applications analysis, tacticians, and battlefield commanders … Operation of the HHC requires minimal instruction and all actions of the operator are prompted by displayed alphanumeric inquiries …
CONTENTS
iii ILLUSTRATIVE APPLICATIONS OF HHC ANALYSIS. . . . 10
APPENDIX _ TGT-ACQ PROGRAM LISTING . . . . . . . . . . 17

BEST!
SlideRule

Very interesting, regrettably the program listing is illegible, not your fault of course...

Thanks for the review. I endeavor to locate through inter-library loan (academic) a better copy, til then …

a modestly cleaner copy at ADA116112

Thanks! - much better, I'll give it a try - will put it in an application ROM to share.

(02-13-2019 01:39 PM)Ángel Martin Wrote: [ -> ]Thanks! - much better, I'll give it a try - will put it in an application ROM to share.

You're welcome: sorry for the low-res posting.
SlideRule