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AtariHardwareMap

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Atari hardware map


In the following table, question marks '?' means that specifications are still unknown -- if you know some of these, please contribute! (see HowToContribute)

Hardware bus address Chip ST STf Mega ST STe Mega STe TT? Falcon030? Medusa? Hades? Milan?
0x00000000-0x003FFFFF ST-RAM till 4MB X X X X X X X X X X
0x00400000-0x009FFFFF ST-RAM till 10MB - - - - - - X ? ? ?
0x00A00000-0x00DFFFFF VME address space - - - - X X - ? ? ?
0x00A00000-0x00DFFFFF ST-RAM till 14MB (replaces VME address space on Falcon030?) - - - - - - X ? ? ?
0x00E00000-0x00E7FFFF ROM - - - X X X X ? ? X
0x00E80000-0x00EFFFFF ROM (shadow from 0x00E00000-0x00E7FFFF) - - - - - - X ? ? ?
0x00F00000-0x00F0003F IDE interface - - - - - - X ? X ?
0x00FA0000-0x00FBFFFF Cartridge port X X X X X X X - - -
0x00FC0000-0x00FEFFFF ROM X X X - - - - ? - ?
0x00FF8000-0x00FF8001 Memory controller X X X X X X X ? X ?
0x00FF8006-0x00FF8007 Processor control - - - - - - X ? X ?
0x00FF8200-0x00FF82FF Shifter, Videl X X X X X X X - - ?
0x00FF8600-0x00FF860F Floppy disk, hard disk DMA X X X X X X X X - ?
0x00FF8700-0x00FF871F SCSI DMA - - - - - X - ? X ?
0x00FF8780-0x00FF878F SCSI controller - - - - - X - ? X ?
0x00FF8800-0x00FF8803 Yamaha YM-2149 sound X X X X X X X ? X ?
0x00FF8900-0x00FF8921 Audio DMA - - - X X X X - - ?
0x00FF8922-0x00FF8925 Microwire - - - X X X - - - ?
0x00FF8930-0x00FF8943 Audio crossbar - - - - - - X - - ?
0x00FF8960-0x00FF8963 Real time clock - - - - X X X ? X ?
0x00FF8A00-0x00FF8A3F Blitter - - X X X - X ? - ?
0x00FF8C00-0x00FF8C15 SCC DMA - - - - X X X - - ?
0x00FF8C80-0x00FF8C87 SCC controller - - - - X X X ? X ?
0x00FF8E00-0x00FF8E0F System control unit - - - - X X - ? X ?
0x00FF8E20-0x00FF8E21 Processor control - - - - X - - ? X ?
0x00FF9200-0x00FF9223 Enhanced joypad ports - - - X - - X - - ?
0x00FF9800-0x00FF9BFF Videl palette registers - - - - - - X - - ?
0x00FFA200-0x00FFA207 DSP 56K host interface - - - - - - X - - ?
0x00FFFA00-0x00FFFA2F MFP #0 X X X X X X X ? X ?
0x00FFFA40-0x00FFFA5F FPU - - X - X - - ? - ?
0x00FFFA80-0x00FFFA8F MFP #1 - - - - - X - ? X ?
0x00FFFC00-0x00FFFC03 ACIA #0 (Keyboard) X X X X X X X ? X ?
0x00FFFC04-0x00FFFC07 ACIA #1 (MIDI?) X X X X X X X ? X ?
0x00FFFC20-0x00FFFC3F Real time clock - - X - - - - ? - ?
0x01000000-0x01FFFFFF TT-RAM - - - - - X - ? ? ?
0x40000000-0x7FFFFFFF PCI memory, overlayed with ISA memory - - - - - - - ? ? X
0x80000000-0xBFFFFFFF PCI I/O, overlayed with ISA I/O - - - - - - - ? ? X
0xC0000000-0xC000DFFF PCI/ISA I/O using big endian addressing - - - - - - - ? ? X
0xFE000000-0xFEFFFFFF VME address space - - - - - X - ? ? ?
0xFF000000-0xFFFFFFFF shadow of 0x00000000-0x00FFFFFF X X X X X X X ? ? ?

Notes

Medusa?, Hades? and Milan? ST-RAM space could be called TT-RAM because video RAM is located in the graphic card RAM and not in this address space. Still, it is called ST-RAM because it uses similar address space as ST-RAM on TT? and Falcon030?.

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