Editing Apple Lisa 2 (section)

== Hardware Specifications ==

=== Core Architecture ===
The Lisa 2 retained the original's fundamental architecture while implementing cost-saving measures:

{| class="wikitable styled-table" style="width:70%; text-align:center;"
|+'''Lisa 2 Hardware Comparison'''
|-
! Component !! Lisa 1 !! Lisa 2/5 !! Lisa 2/10
|-
| CPU || Motorola 68000 @ 5 MHz || colspan="2" | Motorola 68000 @ 5 MHz
|-
| Standard RAM || 1 MB || 512 KB || 512 KB
|-
| Maximum RAM || 2 MB || colspan="2" | 2 MB
|-
| Floppy drives || 2 × Twiggy (871 KB) || 1 × Sony (400 KB) || 2 × Sony (400 KB)
|-
| Hard drive || External ProFile 5 MB || External ProFile 5 MB || Internal Widget 10 MB
|-
| List price || US$9,995 || US$3,495 || US$5,495
|}

=== Memory Configuration ===
The Lisa 2 introduced a new memory architecture to reduce costs:<ref>{{cite web |url=https://wiki.68kmla.org/Apple_Lisa#Lisa_2 |title=Apple Lisa Hardware Information |publisher=68kMLA Wiki |access-date=2025-01-25}}</ref>
* '''Base configuration:''' 512 KB using 256K×1 DRAM chips
* '''Expansion options:''' 
''' 512 KB card (bringing total to 1 MB)
''' 1.5 MB card (bringing total to 2 MB)
* '''Memory map:''' Identical to Lisa 1, maintaining software compatibility

=== Storage Subsystem ===

==== Sony 3.5″ Floppy Implementation ====
The Sony MP-F51W drives offered:<ref>{{cite web |url=https://www.applefritter.com/content/lisa-2-floppy-drive-information |title=Lisa 2 Floppy Drive Information |publisher=Applefritter |access-date=2025-01-25}}</ref>
* 400 KB formatted capacity (single-sided)
* Variable speed rotation (394-590 RPM)
* Automatic disk ejection mechanism
* Enhanced reliability over Twiggy drives

==== Widget Hard Drive (Lisa 2/10) ====
The internal Widget drive represented a significant advancement:<ref>{{cite web |url=http://www.vintagemacworld.com/lisa_widget.html |title=Apple Widget Hard Drive |publisher=Vintage Mac World |access-date=2025-01-25}}</ref>
* 10 MB capacity (compared to 5 MB ProFile)
* Integrated controller board
* Faster seek times (65 ms average)
* Direct connection to Lisa's parallel port
* Built-in diagnostics ROM

=== I/O Port Configuration ===
The Lisa 2 maintained the original's connectivity while adding AppleTalk support:

{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+'''Lisa 2 Port Specifications'''
|-
! Port !! Connector Type !! Protocol !! Maximum Speed
|-
| Serial A || DB-25 || RS-422/RS-232 || 57.6 kbps
|-
| Serial B || DB-25 || RS-422/RS-232/AppleTalk || 230.4 kbps
|-
| Parallel || DB-25 || Centronics/Widget || 500 kbps
|-
| Mouse || DE-9 || Quadrature encoding || N/A
|-
| Keyboard || RJ-11 style || Proprietary serial || 4800 bps
|}