Editing Macintosh Classic (section)

=== Memory Map (Physical) ===
{| class="wikitable styled-table" style="width:80%; text-align:center;"
|+ '''Macintosh Classic Address Space'''
! Range !! Size !! Purpose
|-
| $0000 00 – $0FFF FF || 1 MB || '''On-board DRAM'''
|-
| $1000 00 – $4FFF FF || 4 MB || '''Expansion DRAM''' (if present → 4 MB ceiling)
|-
| $4000 00 – $47FF FF || 512 KB || '''ROM SIMM''' (v7.0)
|-
| $5000 00 – $50FF FF || 64 KB || '''I/O bank A''' – VIA 1/2, SCC, SWIM-II, ADB, VBL PAL
|-
| $5800 00 – $58FF FF || 64 KB || '''SCSI NCR 53C80 regs + glue'''
|-
| $5C00 00 – $5FFF FF || 256 KB || '''Expansion card decode''' (memory & option EEPROM)
|-
| $9000 00 – $9000 FF || 256 B || Frame-buffer shift register (mirrored)
|-
| $C000 00 – $FF FF FF || Mirrors / reserved
|}