Difference between revisions of "Category:84PCE:RAM:By Address"

Revision as of 04:36, 7 April 2015

See also list of RAM areas by name.

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The eZ80 has a 24-bit linear address space. Layout:

• 000000h: Start of flash. The first 128 K are locked boot sectors. The first 8 are divided into 8 K sectors, all of which are locked. Implies that there is no longer a certificate.
• 000066h: Flash exception handler. Write-to-flash without permission triggers the non-maskable interrupt to fire.
• 00007Eh: Hardware/Emu flag: This byte indicates whether the ROM is a hardware ROM or emulator.
• 000080h: Start of boot code jump table.
• D00000h: Start of RAM. 256 K.
• D40000h: Start of VRAM. 320x240x2 bytes = 153600 bytes.

SafeRAM Areas:

• D031F6h: pixelShadow
• D052C6h: pixelShadow2
• D07396h: cmdPixelShadow
  • Each is 8400 bytes in length; and since they are linear, provide a total free space of 25200 bytes of RAM.
  • pixelShadow2 is the most stable; and is a viable option for testing TSRs and hooks.