41CL How to install CLUTILS-4H
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06-19-2018, 02:54 PM
(This post was last modified: 06-21-2018 04:38 AM by Ángel Martin.)
Post: #14
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RE: 41CL How to install CLUTILS-4H
(06-19-2018 02:33 PM)CY-CL Wrote: What is stored in witch section? A diagram like for the HP-41 memory pages would be very helpful to understand better the internal memory structure from a CL. Let me throw a few basic concepts to get you going:- You can think of flash memory as a gigantic repository where hundreds of ROMS are pre-stored from the factory. It is a non-volatile storage space, so its contents is permanent even without batteries. There's also a RAM section on the CL board that can hold dozens of ROM modules. This section comes EMPTY and is available for use. CL_RAM contents will be lost if the batteries are removed from the calculator - but won't be affected by MEMORY LOST, since the CL RAM is not the same as the "HP-41 pages". - You can copy ROMs from flash into CL_RAM. You can also burn flash sectors using the contents of RAM blocks. The way FLASH and CL_RAM are utilized is as follows: - The CL has the same number of "pages" available to the O/S as the standard HP-41, i.e. 16 in total: 8 internal and 8 in the plug-in ports. - The CL uses a facility called "MMU" to map any of those ROMS into CL "pages". Obviously the O/S is mapped to pages 0,1,2,3, the Time module to page 5, and the HP-IL (when connected) to pages 6 and 7. - Except the O/S mentioned above, this ROM-mapping is totally flexible and configurable by the user. It can even be modified from within a FOCAL program running if you want. Hope this helps getting over the hump. ÁM "To live or die by your own sword one must first learn to wield it aptly." |
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