TITLE
    Quadra 610 DOS Compatible and PC Print Spooler (5/94)
Article ID:
Created:
Modified: 		15298
5/5/94
5/24/95
TOPIC


    After running Norton SI or a game on the DOS card, and I switch back to the Macintosh, the PC Print Spooler sends a blank page to the printer, or notifies me of a printing problem. I haven't tried to print, what's going on?

DISCUSSION


    There is a hardware problem with our implementation of an emulated parallel port. Typically when data, on a real PC, is sent to the parallel port, the signal to print is STROBE changing state, a parallel protocol signal line. We don't wait for STROBE, we immediately send the job to the print monitor. Some programs send data to the I/O port address designated for LPT1: but they don't pull the STROBE line low so nothing prints. Since we don't wait for STROBE to go low, it starts printing.

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Document Information
Product Area: Computers
Category: Macintosh Quadra & Centris
Sub Category: Quadra 610 DOS Compatible
Keywords: kwindows

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