Lisa/Macintosh XL
Do-it-yourself Guide
Many people believe that Lisas and Macintosh XL's are exactly the same
computer. In truth, Lisas and XL's only look the same. There are two different
models in the series. The Macintosh XL (a.k.a. Lisa 2/10) is the newest
model. Since there are differences between the models, it's important to
determine which Lisa/Mac XL you own before beginning any upgrade or repair
work.
Identifying the Models
This section lists the official hardware configurations. Hardware means
a specific combination of drives, boards, and so on. By identifying what
hardware is inside the box, you can easily determine which model of the
Lisa you own. Table 1 provides a checklist. The next section provides illustrated
disassembly instructions so that you can match your particular hardware
configuration against the list.
Lisa 2: The Lisa 2 has one 3.5-inch 400K disk drive, different disk
drive controller circuitry, and a redesigned front panel to accommodate
the single 3.5-inch drive opening. A 400K floppy controller, labeled the
"Lisa Lite Adapter," is mounted inside the disk drive cage. The
System I/0 board is socketed for an AMD 9512 arithmetic processor. It has
nickel-cadmium battery backup for the real time clock. One 512K memory board
is standard. The mother board has a mouse connector, two serial connectors,
and an external parallel connector. The power supply is rated 1.2 A.
Lisa 2/10: The Lisa 2/10 has a completely different motherboard.
The mouse connector is different. There's no external parallel connector
on the back of the computer. Instead, there's an internal parallel connector
and a 10MB internal I hard drive. An interrupt switch has been added. The
system