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Custom Menus on High-End RPL Machines
04-02-2019, 11:53 PM
Post: #9
RE: Custom Menus on High-End RPL Machines
(04-02-2019 10:54 AM)Raymond Del Tondo Wrote:  There is no User level RPL in the 42S, only SysRPL. So if you are in the 42S program editor, you'll only have access to FOCAL words, with some 42S extensions, of course.
The program "compiler" creates a FOCAL byte stream, which will be run through the FOCAL execution engine.
This FOCAL byte stream is binary compatible to that of the HP-41 and the HP41CV Emulator card for the HP 48SX.

The actual internal code behind the FOCAL words is RPL or Saturn ML, of course.

Thanks for the detailed explanation Raymond; it's so interesting to still learn new things about the 42S so many years later!

Would you guess that the 42S FOCAL processing was actually based on the 41CV Emulator card code? Now that you've pointed out the similarity, it's an obvious method they could have used, but I never even thought about how similar these 2 are, and never gave it even a moment's thought that it could have been built from the emulator code.

--Bob Prosperi
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RE: Custom Menus on High-End RPL Machines - rprosperi - 04-02-2019 11:53 PM



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