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839c493b67
Better support the IIe's aux slot when it's empty or has the 80-col(1KiB) card. - any h/w using this alternate CPU emulation, (ie. aux=empty or 80-col(1KiB)), then the 'mem' cache is completely bypassed. Debugger: change all the direct 'mem' accesses to go via ReadByteFromMemory(). TestCPU6502: test the alt CPU emulation code too.
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
#pragma once
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// Apple II defines & memory locations
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enum
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{
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// Note: All are in bytes!
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TEXT_PAGE1_BEGIN = 0x0400,
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TEXT_PAGE1_SIZE = 0x0400,
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HGR_PAGE1_BEGIN = 0x2000,
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HGR_PAGE1_SIZE = 0x2000,
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APPLE_SLOT_SIZE = 0x0100, // 1 page = $Cx00 .. $CxFF (slot 1 .. 7)
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APPLE_IO_BEGIN = 0xC000,
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APPLE_IO_END = 0xC0FF,
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APPLE_SLOT_BEGIN = 0xC100, // each slot has 1 page reserved for it
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APPLE_SLOT_END = 0xC7FF,
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FIRMWARE_EXPANSION_SIZE = 0x0800, // 8 pages = $C800 .. $CFFF
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FIRMWARE_EXPANSION_BEGIN = 0xC800, // [C800,CFFF)
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FIRMWARE_EXPANSION_END = 0xCFFF,
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APPLE_TOTAL_IO_SIZE = (FIRMWARE_EXPANSION_END+1) - APPLE_IO_BEGIN
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};
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// 6502 defines & memory locations
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enum
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{
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_6502_BRANCH_POS = +127,
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_6502_BRANCH_NEG = -128,
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_6502_PAGE_SIZE = 0x0100,
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_6502_ZEROPAGE_END = 0x00FF,
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_6502_STACK_BEGIN = 0x0100,
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_6502_STACK_END = 0x01FF,
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_6502_NMI_VECTOR = 0xFFFA,
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_6502_RESET_VECTOR = 0xFFFC,
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_6502_INTERRUPT_VECTOR = 0xFFFE, // IRQ & BRK
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_6502_MEM_BEGIN = 0x0000,
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_6502_MEM_END = 0xFFFF,
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_6502_MEM_LEN = _6502_MEM_END + 1,
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_6502_NUM_PAGES = _6502_MEM_LEN / _6502_PAGE_SIZE,
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_6502_ZERO_PAGE = _6502_MEM_BEGIN >> 8,
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_6502_STACK_PAGE = _6502_STACK_BEGIN >> 8
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};
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