When additional RAM is added to the LaserWriter Pro 810, the configuration changes, and the Macintosh needs to be aware of these changes. If extra memory is added without changing the memory configuration, then time out errors occur.
Changing Memory Configuration
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1) Open the Chooser
2) Select the LaserWriter 8 icon
3) Click the Setup button
4) Click the Configure button
5) Change the memory configuration to match the amount installed in the LaserWriter Pro 810