Editing Macintosh IIx (section)

=== Memory Configuration ===

The IIx uses eight 30-pin SIMM slots arranged in two banks of four. Both banks must be populated with identical SIMMs within each bank.

{| class="wikitable styled-table" style="width:80%; text-align:center;"
|+'''Memory Configurations'''
! Bank A !! Bank B !! Total RAM !! Notes
|-
| 4 × 256 KB || Empty || 1 MB || Minimum configuration
|-
| 4 × 256 KB || 4 × 256 KB || 2 MB || 
|-
| 4 × 1 MB || Empty || 4 MB || 
|-
| 4 × 1 MB || 4 × 1 MB || 8 MB || Maximum without Mode32
|-
| 4 × 4 MB PAL || Empty || 16 MB || Requires Mode32
|-
| 4 × 4 MB PAL || 4 × 1 MB || 20 MB || Requires Mode32
|-
| 4 × 4 MB PAL || 4 × 4 MB PAL || 32 MB || Requires Mode32
|-
| 4 × 16 MB PAL || 4 × 16 MB PAL || 128 MB || Maximum, requires Mode32
|}

'''Important notes:'''
* 4 MB and 16 MB SIMMs must be PAL (Presence Detect) type
* Mode32 or 32-bit System Enabler required for >8 MB configurations
* Bank A must be populated before Bank B can be used