Difference between revisions of "Category:84PCE:RAM:By Address"
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* 00007Eh: Hardware/Emu flag: This byte indicates whether the ROM is a hardware ROM or emulator. | * 00007Eh: Hardware/Emu flag: This byte indicates whether the ROM is a hardware ROM or emulator. | ||
* 000080h: Start of boot code jump table. | * 000080h: Start of boot code jump table. | ||
| + | * 020000h: Start of OS. | ||
| + | * 0C0000h: Start of user archive. | ||
| + | * 3B0000h: Certificate. | ||
| + | * 3C0000h: Temp RAM backup, on newer versions of TIOS debug output is also written here. | ||
| + | * 3E0000h: Temp RAM backup. | ||
| + | * 3F0000h: Temp RAM backup, temp certificate backup, swap sector. | ||
| + | * 400000h: Can be setup to mirror flash, but usually unmapped. | ||
| + | * 800000h: Always unmapped. | ||
* D00000h: Start of RAM. 256 K. | * D00000h: Start of RAM. 256 K. | ||
* D1A87Eh: Top of the SPL stack. | * D1A87Eh: Top of the SPL stack. | ||
* D1A881h: Start of UserMem. | * D1A881h: Start of UserMem. | ||
* D40000h: Start of VRAM. 320x240x2 bytes = 153600 bytes. | * D40000h: Start of VRAM. 320x240x2 bytes = 153600 bytes. | ||
| − | * E00000h: Start of memory-mapped I/O address spaces. | + | * D65800h: Unmapped memory. |
| + | * D72C00h: Unmapped memory (revisions up to at least C) or mirror of D52C00h (at least I-S). | ||
| + | * D80000h: Mirror of D00000h. | ||
| + | * E00000h: Start of [[84PCE:Wait_States|memory-mapped I/O]] address spaces. | ||
SafeRAM Areas: | SafeRAM Areas: | ||
| Line 18: | Line 29: | ||
* D052C6h: [[84PCE:RAM:D052C6|pixelShadow2]] - 8400 bytes | * D052C6h: [[84PCE:RAM:D052C6|pixelShadow2]] - 8400 bytes | ||
* D07396h: [[84PCE:RAM:D07396|cmdPixelShadow]] - 8400 bytes | * D07396h: [[84PCE:RAM:D07396|cmdPixelShadow]] - 8400 bytes | ||
| − | * D09466h: plotSScreen - 21945 bytes | + | * D09466h: [[84PCE:RAM:D09466|plotSScreen]] - 21945 bytes |
| − | * D0EA1Fh: saveSScreen - 21945 bytes | + | * D0EA1Fh: [[84PCE:RAM:D0EA1F|saveSScreen]] - 21945 bytes |
** Note that the above is contiguous, which provides a total linear free space of 69090 bytes of RAM. | ** Note that the above is contiguous, which provides a total linear free space of 69090 bytes of RAM. | ||
| − | ** pixelShadow2 is the most stable; and is a viable option for testing TSRs and hooks. | + | ** [[84PCE:RAM:D052C6|pixelShadow2]] is the most stable; and is a viable option for ''testing'' TSRs and hooks. |
More SafeRAM Areas: | More SafeRAM Areas: | ||
| − | * D006C0h: [[84PCE:RAM:D006C0|textShadow ]] - 260 bytes | + | * D006C0h: [[84PCE:RAM:D006C0|textShadow]] - 260 bytes |
| − | * D0232Dh: cmdShadow - 260 bytes | + | * D0232Dh: [[84PCE:RAM:D0232D|cmdShadow]] - 260 bytes |
Also, if you do not wish to use the LCD cursor (This is not RAM, but can be used as scrap) | Also, if you do not wish to use the LCD cursor (This is not RAM, but can be used as scrap) | ||
* E30800h: cursorImage - 1024 bytes | * E30800h: cursorImage - 1024 bytes | ||
[[Category:84PCE:RAM|RAM Areas by Address]] | [[Category:84PCE:RAM|RAM Areas by Address]] | ||
Latest revision as of 12:32, 20 September 2021
See also list of RAM areas by name.
Please read our page on Contributing before editing these pages!
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. The certificate is now a single 64 K sector, so I hope you don't crash while rebuilding it.
- 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.
- 020000h: Start of OS.
- 0C0000h: Start of user archive.
- 3B0000h: Certificate.
- 3C0000h: Temp RAM backup, on newer versions of TIOS debug output is also written here.
- 3E0000h: Temp RAM backup.
- 3F0000h: Temp RAM backup, temp certificate backup, swap sector.
- 400000h: Can be setup to mirror flash, but usually unmapped.
- 800000h: Always unmapped.
- D00000h: Start of RAM. 256 K.
- D1A87Eh: Top of the SPL stack.
- D1A881h: Start of UserMem.
- D40000h: Start of VRAM. 320x240x2 bytes = 153600 bytes.
- D65800h: Unmapped memory.
- D72C00h: Unmapped memory (revisions up to at least C) or mirror of D52C00h (at least I-S).
- D80000h: Mirror of D00000h.
- E00000h: Start of memory-mapped I/O address spaces.
SafeRAM Areas:
- D031F6h: pixelShadow - 8400 bytes
- D052C6h: pixelShadow2 - 8400 bytes
- D07396h: cmdPixelShadow - 8400 bytes
- D09466h: plotSScreen - 21945 bytes
- D0EA1Fh: saveSScreen - 21945 bytes
- Note that the above is contiguous, which provides a total linear free space of 69090 bytes of RAM.
- pixelShadow2 is the most stable; and is a viable option for testing TSRs and hooks.
More SafeRAM Areas:
- D006C0h: textShadow - 260 bytes
- D0232Dh: cmdShadow - 260 bytes
Also, if you do not wish to use the LCD cursor (This is not RAM, but can be used as scrap)
- E30800h: cursorImage - 1024 bytes
Pages in category "84PCE:RAM:By Address"
The following 38 pages are in this category, out of 38 total.
D |
D cont. |
D cont. |
