TEST FOR REAL PENTAGON 1024SL 2.2

LET P1=32765:LET P2=61431
OUT P2,0 ;enable 1MB
OUT P1,16:POKE 49152,16 ;signed page 16
OUT P1,17:POKE 49152,17 ;signed page 17
OUT P1,32+16:POKE 49152,32+16 ;extra memory page
OUT P2,4 ;switch to 128 mode
OUT P1,17:PRINT PEEK 49152 ;show active page

If I set D5 in 1MB mode, will after switch to 128kB mode disabled port 7FFD ? My program return value 16 if will disabled port 7FFD, or 17 if will enabled.