----8<----------------------------------------------------------
   ld a,003h     ; bits 0-4: RAM page 3;
   out (0fah),a  ; allocate pages 3 & 4 to section A
----8<----------------------------------------------------------

Is the bit needed in order to make the system know ROM0 is paged out?
Does it have to be set always for allocating a RAM page to section A?

Yes - you've got that spot on.  The bit simply allows RAM to
replace the ROM in that lower section.

Chris.

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