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The "Ass-Backward Calculator" for the Apple //GS - an RPN calculator NDA
[Download a disk image]( or [download a SHK file](
The source code is built using my [Apple //GS Build Pipeline](
If you setup all of the prerequisites on that project, you should be able to build this on a Mac
using Xcode. Failing that, put the source onto a real or emulated GS and build it using ORCA/C.
However, I no longer have a GS compatible Makefile. If you look in the git history, you will see that
in the past, the build could be done using dmake under GNO/ME on a GS.
The abCalc binary is a shell command you can use from GNO/ME:
![abCalc Shell Screenshot](/abCalc/screenshots/abCalc.png "abCalc Shell Screenshot")
And abCalcNDA is a new desk accessory which you can use from within GS/OS applications:
![abCalc NDA Screenshot](/abCalc/screenshots/abCalcNDA.png "abCalc NDA Screenshot")
[abCalc NDA Documentation](/abCalc/