LaserWriter Plus

Ethan Dicks ethan.dicks at
Sun Apr 10 14:59:30 CDT 2005

On Apr 10, 2005 1:02 PM, Scott Stevens <chenmel at> wrote:
> The LaserWriter had one of those massive 64 pin DIP package 68000 chips
> on it.  Often the LaserWriter had a more powerful CPU than the Macintosh
> connected to it.

The size and internal arrangement of the 68000 CPU was identical
between the Mac 128/512/Plus/etc and the LaserWriter (64-pin DIP, 8
32-bit D registers, 8 32-bit A registers, 23-bit address bus, 16-bit
data bus...).  The difference was that the computers ran at a nominal
8MHz (less effective speed due to video-induced bus blockages), and
the printers ran at 12MHz.

The 64-pin DIP was the standard 68000/68010 package, and only came in
a Z package (square with pins underneath), and a PLCC package (square,
SMT pins on the sides) later.

I think Eric Smith has the RAM/ROM differences right.  The original LW
had 1.5MB of RAM and 512K of ROM, and I _think_ the Plus had an
additional 512K of ROM (more PostScript fonts, IIRC).


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