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79 lines
2.3 KiB
79 lines
2.3 KiB
;==================================================================================================
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; MEMORY PAGE MANAGEMENT
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;==================================================================================================
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;
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; PAGE THE REQUESTED 32K BLOCK OF RAM/ROM INTO THE LOWER 32K OF CPU ADDRESS SPACE.
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; LOAD DESIRED PAGE INDEX INTO A AND CALL EITHER RAMPG OR ROMPG AS DESIRED.
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; RAMPGZ AND ROMPGZ ARE SHORTCUTS TO PAGE IN THE RAM/ROM ZERO PAGE.
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;______________________________________________________________________________________________________________________
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;
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#IF (PLATFORM = PLT_N8)
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RAMPGZ: ; SELECT RAM PAGE ZERO
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XOR A
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RAMPG:
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RLCA
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RLCA
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RLCA
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OUT0 (CPU_BBR),A
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LD A,DEFACR | 80H
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OUT0 (ACR),A
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RET
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;
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ROMPGZ: ; SELECT ROM PAGE ZERO
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XOR A
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ROMPG:
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OUT0 (RMAP),A
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XOR A
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OUT0 (CPU_BBR),A
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LD A,DEFACR
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OUT0 (ACR),A
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RET
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#ELSE
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RAMPGZ: ; SELECT RAM PAGE ZERO
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XOR A
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RAMPG:
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OR 80H ; TURN ON BIT 7 TO SELECT RAM PAGES
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JR PGSEL
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ROMPGZ: ; SELECT ROM PAGE ZERO
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XOR A
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ROMPG:
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AND 7FH ; TURN OFF BIT 7 TO SELECT ROM PAGES
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JR PGSEL
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PGSEL:
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OUT (MPCL_ROM),A
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OUT (MPCL_RAM),A
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RET
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#ENDIF
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;
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;______________________________________________________________________________________________________________________
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;
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; MACROS TO PERFORM RAM/ROM PAGE SELECTION INTO LOWER 32K OF MEMORY SPACE
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; PGRAM(P) SELECT RAM PAGE P
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; PGRAMF(P) SELECT RAM PAGE P, FAST VERSION ASSUMES CURRENT PAGE IS A RAM PAGE
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; PGROM(P) SELECT ROM PAGE P
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; PGROMF(P) SELECT ROM PAGE P, FAST VERSION ASSUMES CURRENT PAGE IS A ROM PAGE
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;
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; REGISTER A IS DESTROYED
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;______________________________________________________________________________________________________________________
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;
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#IF (PLATFORM = PLT_N8)
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#DEFINE PGRAM(P) LD A,P << 3 \ OUT0 (CPU_BBR),A \ LD A,DEFACR | 80H \ OUT0 (ACR),A
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#DEFINE PGRAMF(P) LD A,P << 3 \ OUT0 (CPU_BBR),A
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#DEFINE PGROM(P) LD A,P \ OUT0 (RMAP),A \ XOR A \ OUT0 (CPU_BBR),A \ LD A,DEFACR \ OUT0 (ACR),A
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#DEFINE PGROMF(P) LD A,P \ OUT0 (RMAP),A
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#ELSE
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#DEFINE PGRAM(P) LD A,P | 80H \ OUT (MPCL_ROM),A \ OUT (MPCL_RAM),A
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#DEFINE PGRAMF(P) LD A,P | 80H \ OUT (MPCL_RAM),A
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#DEFINE PGROM(P) LD A,P & 7FH \ OUT (MPCL_ROM),A \ OUT (MPCL_RAM),A
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#DEFINE PGROMF(P) LD A,P & 7FH \ OUT (MPCL_ROM),A
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#ENDIF
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