*****Re: Apple Lisa 1

The original Lisa, also known as the Lisa 1, was introduced in early 1983 and had two internal 5.25-inch "Twiggy" floppy drives with about 880K capacity each. The optional hard drive was an external Profile, which originally had 5 MB capacity but was later offered in a 10 MB version. In early 1984, Apple introduced the Lisa 2, which came in three models: * Lisa 2 - single internal 3.5-inch Sony floppy drive, 400K capacity. * Lisa 2/5 - same as Lisa 2, but with a 5 MB external Profile hard drive * Lisa 2/10 - Lisa 2 with an internal 10 MB "Widget" 10 MB hard drive note - this has a different I/O card and backplane than the earlier models (1, 2, 2/5) When the Lisa 2 was introduced, Apple offered a free upgrade from the Lisa 1, so very few Lisa 1 machines still exist. This was apparently due to problems with reliability of the Twiggy drives. There was a shareholder lawsuit alleging that Apple withheld information on the Twiggy problem from the shareholders. In 1985, Apple introduced the Macintosh XL - a Lisa 2/10 with a "screen mod kit" and MacWorks (Mac OS for Lisa). The screen mod kit changed the display resolution such that the pixels are square, as expected by Macintosh software. MacWorks did not require the screen mod kit, but without it circles appear as ellipses, etc. The screen mod kit was available as an upgrade. This consisted of a transformer to be installed in the monitor, a new video state PROM for the I/O board, and new boot firmware for the CPU board. With a screen mod kit installed, a Lisa can no longer run the native Lisa software. However, a third party offered a kit allowing the screen mod to be switched.