I need help with using the 41CL
09-15-2021, 09:17 PM (This post was last modified: 09-15-2021 10:06 PM by Sylvain Cote.)
Post: #16
 Sylvain Cote Senior Member Posts: 1,717 Joined: Dec 2013
RE: I need help with using the 41CL
Hello Uli,

After a memory lost, the memory management unit (MMU) is disable and CAT 2 should show this:
Code:
-TIME  3B -CL TIME -YFNZ 4G -EXT FCN 3B -CL EXT FCN

Now, page 18 configuration assume the MMU is disabled (after a Memory Lost)
Code:
MMUCLR        // clear memory management unit "YFNZ"        // 41CL Extra Functions module name in the 41CL module database PLUG1L        // map module to port 1 lower page (aka page 8) MMUEN         // enable MMU

At this point, excepted for a different page mapping, CAT 2 should show the same things as it was when the MMU was disabled.

Your error was after that, you should have used PLUG1U to map the math module to the upper page of port 1 (aka page 9) but instead you used the PORT1 command (page 8 and 9) and in effect unmapping the YFNZ module from PORT1L (aka page 8).
All the PLUG/UPLUG commands are part of the YFNZ ROM and since the ROM was unmapped they were no longer available.

This back door will allow you to disable the MMU and go back to your feet.
Code:
XEQ "YRES"

Now redo the initial configuration but this time map the math module to PORT1U or to another port.

Sylvain
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