====== Apple II Memory Map ======

===== Main RAM / IIgs Bank 0 =====

The IIgs screen buffers listed are not where the hardware actually draws them from.  The real screen buffers are in Mega II "Slow RAM" bank $E0 and $E1.  The IIgs hardware supports shadowing of the Bank 0 screen buffers to bank $E0.

^ Address(es) ^ Use ^
| 0000--00FF | 6502 Zero Page |
| 0100--01FF | 6502 Stack |
| 0200--02FF | Input buffer (monitor routines) |
| 0300--03FF | Page 3 |
| 03D0--03D2 | Warm start jump vector (Q in IIgs monitor jumps here if $3D0=$4C) |
| 03F0--03F1 | BRK vector |
| 03F2--03F3 | Reset Vector |
| 03F4       | PWRUP byte = $3F3 XOR $A5 |
| 03F5--03F7 | Applesoft & Vector |
| 03F8--03FA | Monitor Ctrl-Y jump vector |
| 03FB--03FD | NMI jump vector |
| 03FE--03FF | IRQ vector |
| 0400--07FF | Text page 0 |
| 0800--BFFF | Free memory with no DOS |
| 0800--BEFF | Free memory under ProDOS 8 |
| 0800--09FF | Boot firmware loads block 0 here |
| 0800--0CFF | Text screen 2 |
| 1000--.... | ProDOS 8 loads ATINIT here (ATINIT size must not stomp on the ProDOS init code) |
| 1000--12FF | ProDOS 8 copies QUIT code here and jumps to it |
| 2000--BEFF | ProDOS 8 system programs load here |
| 2000--4000 | HGR page 1 |
| 4000--6000 | HGR page 2 |
| 6800--.... | Start.GS.OS gets loaded here |
| BD00--BDFF | GS/OS direct page |
| BE00--BEFF | BASIC.SYSTEM global page |
| BF00--BFFF | ProDOS 8 global page |
| C000--CFFF | I/O space \\ On IIgs this is mapped to Mega II |
| C000--C0FF | [[mg_notes:general:io_page|I/O Page]] |
| C080--C0FF | Slots (or ports) 0--7 Device Select $C080+$n0--$C08F+$n0 (usually H/W) |
| C100--CFFF | Apple IIe/IIc/IIgs: INTCXROM |
| C100--C7FF | Slots (or ports) 1--7 I/O select $CxFF (usually ROM) |
| C800--CFFF | Slots 1--7 I/O Strobe (usually shared ROM space) |
| CFFF       | All slots should release $C800 space |
| D000--FFFF | Bank 0 language card |
| D000--DFFF | Bank 1 language card |
| D000--FFFF | ROM |
| D000--F7FF | Applesoft BASIC |
| D000--D7FF | D0 ROM, Programmer's Aid #1 (Integer II) |
| D800--D8FF | D8 ROM |
| E000--F7FF | Integer Basic and Sweet 16 |
| E000       | BASIC cold start |
| E003       | BASIC warm start |
| F800--FFFF | Monitor ROM |
| FFFA--FFFF | 6502 Vectors |

===== Aux RAM / IIgs Bank 1 =====

The IIgs screen buffers listed are not where the hardware actually draws them from.  The real screen buffers are in Mega II "Slow RAM" bank $E0 and $E1.  The IIgs hardware supports shadowing of the Bank 1 screen buffers to bank $E1.

| 0000--00FF | Aux Zero Page |
| 0100--01FF | Aux Stack |
| 0400--07FF | 80-column text page, even columns |
| 2000--9FFF | GS Super Hires screen |
| 2000--4000 | Double Hires page 1, even columns |
| 4000--6000 | Double Hires page 2, even columns |
| 9D00--9DFF | GS Super Hires SCBs (not usually enabled) |
| 9D00--9DFF | GS Super Hires palettes (not usually enabled) |
| C000--CFFF | I/O space just like bank 0 |
| D000--FFFF | Aux Bank 0 language card |
| D000--DFFF | Aux Bank 1 language card |

===== IIgs Banks $02 - $FF =====

^ Address(es) ^ Use ^
| 02/0000--7F/FFFF | Fast RAM |
| 80/0000--DF/FFFF | Not decoded by IIgs hardware.  Most emulators expand RAM here. |
| E0/0000--E0/FFFF | Mega II "Slow RAM" main bank |
| E0/0400--E0/07FF | Real text page 1 buffer |
| E0/0800--E0/0CFF | Real text page 2 buffer |
| E0/2000--E0/3FFF | Real hires page 1 buffer |
| E0/4000--E0/5FFF | Real hires page 2 buffer |
| E0/C000--E0/CFFF | I/O space like bank 0 |
| E0/D000--E0/FFFF | Language Card |
| E1/0000--E1/FFFF | Mega II "Slow RAM" aux bank |
| E1/0400--E1/07FF | Real 80-col text page 1 buffer |
| E1/0800--E1/0CFF | Real 80-text page 2 buffer |
| E1/2000--E1/9FFF | Real Super Hires screen |
| E1/2000--E1/3FFF | Real double hires page 1 buffer |
| E1/4000--E1/5FFF | Real double hires page 2 buffer |
| E1/9D00--E1/9DFF | Real Super Hires SCBs |
| E1/9D00--E1/9DFF | Real Super Hires palettes |
| E1/C000--E1/CFFF | I/O space like bank 1 |
| E1/D000--E1/FFFF | Aux Language Card |
| E2/0000--EF/FFFF | Not decoded by IIgs hardware \\ Sweet 16: Frame buffer direct access |
| F0/0000--F7/FFFF | ROM disk space |
| F8/0000--FB/FFFF | ROM tools space |
| FC/0000--FD/FFFF | ROM 3 space |
| FE/0000--FF/FFFF | ROM 1 and 3 space |