2020-03-04 01:21:14 +00:00
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# VIRTUAL MEMORY MAP
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| Address | Area |
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|:-------------:|:--------------------------------------:|
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| 0x5FFFE000 | InfoRecord |
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| 0x5FFFEFF0 | NKSystemInfo |
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| 0x68000000 | Motorola 68K Emulator (0x100000 bytes) |
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| 0x68060000 | Emulator Code |
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| 0x68080000 | Opcode Dispatch Table |
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| 0x68FFE000 | KernelData |
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| 0x68FFF000 | EmulatorData |
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2022-08-22 06:49:18 +00:00
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| 0xFF800000 | Open Firmware |
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2020-03-04 01:21:14 +00:00
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| 0xFFF0C000 | HardwarePriv |
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# PHYSICAL MEMORY MAP
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## NuBus Power Macs
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(Sourced Heavily from: http://mess.redump.net/mess/driver_info/mac_technical_notes)
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|Starting Address|Ending Address| Area |
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|:--------------:|:------------:|:----------------------------:|
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| 0x00000000 | 0x3FFFFFFF | Main Memory |
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| 0x40000000 | 0x4FFFFFFF | ROM Mirrors |
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| 0x50000000 | 0x5FFFFFFF | IO Devices |
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| 0x5FFFFFFC | | "cpuid", really a Machine ID |
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| 0x60000000 | 0xEFFFFFFF | NuBus "super slot" space |
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| 0xF1000000 | 0xFFBFFFFF | NuBus "standard slot" space |
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| 0xFFC00000 | 0xFFFFFFFF | ROM |
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2020-03-05 02:32:15 +00:00
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### IO Bus
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| Address | Area |
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|:-------------:|:------------------:|
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| 0x50F00000 | IO Base Address |
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| 0x50F04000 | SCC |
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| 0x50F14000 | Sound Chip (AWACS) |
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| 0x50F24000 | CLUT Control |
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| 0x50F28000 | Video Control |
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| 0x50F2A000 | Interrupt Control |
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2020-03-04 01:21:14 +00:00
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## PCI Power Macs
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### Main Memory
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* 0x00000000 - 0x7FFFFFFF
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2022-08-22 06:49:18 +00:00
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Mac OS
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* 0x00400000 - Open Firmware
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2020-03-04 01:21:14 +00:00
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### PCI/Device Memory Area 0x80000000 - 0xFF000000
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2022-08-22 06:49:18 +00:00
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2020-03-04 01:21:14 +00:00
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* 0x81000000 - Video Display Device (normally)
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2022-08-22 06:49:18 +00:00
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2020-03-04 01:21:14 +00:00
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* 0xF3000000 -
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Mac OS I/O Device area
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* 0xF3008000 - 0xF3008FFF - DMA Channels
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* 0xF3008000 - SCSI DMA
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* 0xF3008100 - Floppy DMA
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* 0xF3008200 - Ethernet transmit DMA
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* 0xF3008300 - Ethernet receive DMA
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* 0xF3008400 - SCC channel A transmit DMA
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* 0xF3008500 - SCC channel A receive DMA
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* 0xF3008600 - SCC channel B transmit DMA
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* 0xF3008700 - SCC channel B receive DMA
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* 0xF3008800 - Audio out DMA
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* 0xF3008900 - Audio in DMA
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* 0xF3009000 - ATI Mach 64 video card
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* 0xF3010000 - SCSI device registers (0x100 bytes)
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* 0xF3011000 - MACE (serial) device registers (0x100 bytes)
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* 0xF3012000 - SCC compatibility port (?) (0x100 bytes)
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* 0xF3013000 - SCC MacRISC port (Serial for 0x20, then Modem for 0x20, with remaining 0xC0 unknown)
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* 0xF3014000 - AWAC (Audio) chip device registers
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* 0xF3015000 - SWIM3 (floppy controller) device registers
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* 0xF3016000 - pseudo VIA1 device registers
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* 0xF3017000 - pseudo VIA2 device registers
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* 0xF3020000 - Heathrow ATA
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* 0xF8000000 - Hammerhead memory controller registers (0x1000000 bytes)
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* 0xFE010000 - 53C875 Hard Drive Controller
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* 0xFE000000 - Grackle Low/Base
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* 0xFEC00000 - Grackle CONFIG_ADDR (0x4 bytes, all redirected to 0xXXXXXCF8)
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* 0xFEE00000 - Grackle CONFIG_DATA (0x4 bytes, all redirected to 0xXXXXXCFF)
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### ROM / Misc Area (0xFF000000 - 0xFFFFFFFF)
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* 0xFF000000 - ?
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* 0xFF000004 - "cpuid", really a machine ID
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* 0xFFC00000 - 0xFFFFFFFF
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Mac OS ROM Area
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* 0xFFC00000 - 0xFFEFFFFF - 68k Code Area
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(below addresses apply to Old World ROMs)
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* 0xFFF00100 - Reset Area (where the ROM begins executing)
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* 0xFFF10000 - Nanokernel Code
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* 0xFFF20000 - HW Init
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