The Macintosh XL is a modified version of the Apple Lisa personal computer made by Apple Computer, Inc. In the Macintosh XL configuration, the computer shipped with MacWorks XL, a Lisa program that allowed 64 K Macintosh ROM emulation. An identical machine was previously sold as the Lisa 2/10 with the Lisa OS only.
| Manufacturer | Apple Computer Company | CPU | Motorola 68000 @ 5 MHz |
| Year Introduced | 1985 | RAM | 512KB |
| Introductory Price | $3,995 | Storage | 400K 3.5" floppy drive |
Because of its roots as a Lisa — unlike all other Macintosh computers — the stock Macintosh XL used rectangular pixels. The resolution of the Macintosh XL’s 12 inch (30.5 cm) display was 720×364. Square pixels were available via the Macintosh XL Screen Kit upgrade that changed the resolution to 608×432. The CPU could be replaced with a new CPU board containing up to 8 MB RAM, called the XLerator 18. The maximum upgraded RAM with conventional add-in RAM cards was up to 2 MB – four times larger than the maximum capacity of earlier Macintosh computers. (With modifications to the CPU board, the Macintosh XL could accommodate up to 4 MB of RAM.)