Here's the solution of the Aldus PageMaker/video card problem. The problem
relates to the configuration information carried in the video card ROM (and the
video portion of the Macintosh IIci CPU ROM) and the way QuickDraw and
PageMaker use this information. Each display in a Macintosh II carries a
fixed-point representation of the horizontal and vertical pixel resolution in
dots-per-inch. Because QuickDraw is an integer-based drawing system, it does
not attempt to scale its object rendering to match this reported screen
resolution. Instead, it assumes 72.0 dpi, which is the nominal resolution for
the classic Macintosh and the 12-inch, high-resolution monitors.
The video software specifications (which also apply to third-party developers)
have been updated to recommend that video configuration ROMs reflect the true
screen resolution of the displays it supports. Although 32-Bit QuickDraw
continues to ignore the resolution fields, all video hardware released since
32-Bit QuickDraw introduction includes appropriate resolution information;
specifically, 80.0 dpi for the Portrait Display and 77 dpi for the Two-Page
Monochrome Monitor. This applies to a post-introduction revision of the
Portrait Display and Two-Page Monochrome Monitor Video Cards and to the
Macintosh IIci built-in video software.
The problem is that PageMaker uses these resolution fields to scale font width
tables for screen display based on a traditional low-memory global. This
global is updated by the QuickDraw setup code to reflect the screen resolution
of the main screen (the screen with the menu bar). The line-spacing problems
happen because PageMaker scales the font widths, while QuickDraw and the Font
Manager do not. The problems are not directly related to the video hardware or
the CPU ROMs.
Solution
--------
Upgrade to PageMaker 4.0, which takes into account QuickDraw's behavior with
screen fonts. The problem described in this article applies only to PageMaker
versions earlier than 4.0.
Other Notes
-----------
Many applications that run on both Color QuickDraw and Classic QuickDraw
machines look at a collection of low-memory globals to determine system
configuration. Although every effort has been made to keep these low-memory
globals compatible with their original intent, many of them have become
obsolete in a multiscreen/multidepth world. It is likely that other
applications may display similar problems, particularly those programs with
highly customized code for printing or other device-independent imaging.
Affected Revisions
------------------
All 68000-based Macintoshes (Plus, SE, and Portable) always report 72.0 dpi
resolution and should not exhibit any problems.
Macintosh II Video Card: always reports 72.0 dpi
Macintosh II High-Resolution Video Card: always reports 72.0 dpi
Macintosh Monochrome Video Card: always reports 72.0 dpi
Macintosh SE/30 Built-In Video: always reports 72.0 dpi
Macintosh II Portrait Display Card:
- ROM Part 341-0699: reports 72.0 dpi on the Portrait Display and Two-Page
Monochrome Monitor
- ROM Part 341-0732 (current): reports 80.0 dpi on the Portrait Display,
77.0 dpi on the Two-Page Monochrome Monitor
Macintosh II Two-Page Monochrome Monitor Card:
- ROM Part 341-#### (all previous versions): reports 72.0 dpi on the Portrait
Display and Two-Page Monochrome
Monitor
- ROM Part 341-0727 (current): reports 80.0 dpi on the Portrait Display,
77.0 dpi on the Two-Page Monochrome Monitor
Macintosh IIci Built-In Video: reports 80.0 dpi on the Portrait Display,
72.0 dpi on all other displays.