#SQUARE PROCSSOR MAC#
We ran various graphics demos, with Bill Atkinson doing the talking, and then Burrell gave a presentation on the Mac design, and his ideas for scaling it up to 768 by 512 display.
#SQUARE PROCSSOR SOFTWARE#
Wayne Rosing led a delegation of his top hardware and software guys over to Texaco Towers for a demo on a Monday afternoon, including hardware guys Rich Page and Paul Baker and software manager Bruce Daniels. Bill convinced the Lisa engineering manager, Wayne Rosing, that he should at least consider adopting some of Burrell's ideas, and arranged for the leadership of the Lisa team to get a demo of the current Macintosh, and learn about Burrell's new scaled-up design.
#SQUARE PROCSSOR FULL#
He mentioned his desire to Burrell, who responded by working over the weekend to sketch out a scaled up version of the Macintosh design that featured a full 16-bit memory bus with a 768 by 512 display and square dots, that would also run twice as fast as the current Lisa design. The Lisa hardware was scheduled to go through a final round of design tweaks, and Bill tried to convince them to switch to square dots. But Burrell's redesign moved the debate from the theoretical to the pragmatic, by creating a square dots machine to compare with the Lisa. Tom Malloy, who was Apple's first hire from Xerox PARC and the principal author of the Lisa word processor, thought that it was better to have the increased horizontal resolution. Square dots made it easier to write graphical applications, since you didn't have to worry about the resolution disparity.īill Atkinson, the author of Quickdraw and the main Lisa graphics programmer, was a strong advocate of square dots, but not everyone on the Lisa team felt the same way. Among other advantages was the fact that the Mac's 384 by 256 pixel display had the identical horizontal and vertical resolution, a feature that we called "square dots". Not only was Burrell's new design much simpler than Lisa, with less than half the chip count, but it also ran almost twice as fast, using an 8 megahertz clock instead of a 5 megahertz clock. When Burrell redesigned the Macintosh in December 1980 to use the same microprocessor as Lisa, the Motorola 68000, it set off shock waves within Apple. This was great for text oriented applications like the word processor, but it made things somewhat awkward for the more graphical applications. The designers decided to endow Lisa with twice as much horizontal resolution as vertical, using a 720 by 360 pixel display, with pixels that were twice as high as they were wide. The vertical resolution wasn't as important, because vertical scrolling works much better for text than horizontal scrolling.
The Lisa team decided to optimize their display for horizontal resolution, in order to be able to display 80 columns of text in an attractive font.
In the late seventies, the acid test for an office computer (as compared with a hobby computer) was the ability to display 80 columns of text. From the very beginning, even before it had a mouse, the Lisa was designed to be an office machine, and word processing was considered to be its most important application.
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