Add UNAPI RAM Helper compatible mapper support routines #34
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This pull request extends the mapper support routines with four new routines:
CALLRAM: call a routine in another slot and segment, pass parameters in registersREADRAM: read a byte from an address in a slot+segment combinationCALLRAM2: call a routine in another slot and segment, pass parameters in stackWRITERAM: write a byte to an address in a slot+segment combinationThe first three are compatible with the UNAPI RAM Helper, including the extended BIOS based detection mechanism.
WARNING: BREAKING CHANGE
The entry points for these routines go right after
GET_P3in the jump table for the mapper support routines. In previous versions this area contained entry points forALL_BKandFR_BK, which were routines for simple "malloc" style block allocation. There two routines have been removed from Nextor, but their source file (source/kernel/bank4/bkalloc.mac) has been left in place so that it can be examined and reused in application programs if necessary.