Programming multiple ppages MC9S12DP512

[astro_goto]

My "goto" telescope built around an MC9S12DP512 programmed in assembly is working just great! The program uses floating point routines from AN974 and occupies 11463 bytes of unpaged memory (ppage $3F) plus 12745 bytes in ppage $22.  The unpaged code loads with the S12Dx512 Boot-loader v1.0.1 and a BDM POD loads ppage $22 with D-Bug12 4.0.b32 using the FLOAD 8000 ;np command. I know how to calculate the FLOAD addresses for other ppages.

However, I am needing to write more code beyond the ~3600 bytes remaining in ppage $22 and am uncertain how to proceed.  The program uses an ORG $C000 for the unpaged Fixed Flash Array (ppage $3F) and ORG $8000 for the code in ppage $22. The last byte of code in ppage $22 must  load in $BFFF.  Anymore code will just overlap the stuff at ORG $C000. The additional proposed code must access global variables and subroutines in ppage $3F and also subroutines in ppage $22. How to calculate an ORG statement for additional ppages of code when the FTS512K4 User Guide says that ppages $20 through $3E must be accessed through the 16K window $8000-$BFFF as I'm doing for ppage $22 ?

My development tool is MGTEK's MiniIDE running on a laptop PC. Downloading to the MC9SDP512 flash is with HyperTerminal.

[kef]

page $3E is also fixed unpaged page (like paae $3F) available at $4000.

You could org all your code to start at $4000 and end at $Fxxx, including page window $8000-$BFFF. Reset default PPAGE value on S12 parts is 0. In single chip modes, PPAGE=0 maps the least available page to page window. PPAGE=0 on S12DP512 is the same like PPAGE=$20, PPAGE=1 the same like PPAGE=$21 etc, only 5 least order bits of PPAGE are used. Hovewer breakpoints in page window may not work wen PPAGE<$20, so you may need to load $8000 to page $20 and setup PPAGE=$20 soon after reset.

[astro_goto]

I deeply appreciate the org $4000 clue by kef. However, it took some work to flesh out the details. This note may help
others with a similar problem. All the unpaged org $4000 and org $C000 code, along with the vector table additions,
can be converted together by SRecCvt-Gui with settings input=banked, output=linear and then downloaded to Flash with
the Serial BootLoader. Other paged code, like $22, need the "Linear $4000-$FFFF to paged" box checked in SRecCvt-Gui
and downloaded with BDM POD using LOAD or FLOAD and the proper offset. Conversion of paged .S19 files with SRecCvt-Gui generates S2 addresses = 80000. On loading, an offset must be added to place the code in the proper linear address range in memory. Example, 80000 + offset 54000 =  linear address $D4000 for page $35.