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- CONCURRENT DOS 386
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- Release 3.0 Documentation Addenda
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- January 1989
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- INSTALLATION GUIDE
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- Using the IBM Enhanced Graphics Adapter (EGA):
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- 1) With Serial Communications Applications:
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- If you run an application that receives data over one or both
- serial ports, you should not concurrently run any program that
- uses colors. Any change in colors, whether commanded by the
- application itself or by Concurrent when you switch windows, can
- result in data loss at the serial port for the following reason:
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- Concurrent uses "interrupts" to maximize the performance (speed)
- of programs running in background windows while data is being
- received from one or both serial ports. Using interrupts,
- Concurrent runs background programs without pausing to check the
- serial port to see if a character has been received. Instead, the
- serial port signals Concurrent when a character has been
- received, and only then does Concurrent pause to get the
- character and pass it to the receiving program.
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- Application programs may command your system's microprocessor to
- ignore interrupts for any length of time, and if one program does
- this while another program is receiving characters from a serial
- port, it is possible for one or more characters to be missed.
- Specifically, when the EGA has been commanded to change
- background or border colors, it causes the microprocessor to
- ignore interrupts for up to 1/60 of a second. At a transfer rate
- of 9600 BAUD, a maximum of 16 characters may be missed while
- interrupt recognition is disabled. Fewer characters are missed
- at slower BAUD rates. Most communications programs are able to
- properly handle missing characters, but some are not. It is for
- this reason that color-changing on the EGA and serial
- communications are incompatible.
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- USER GUIDE
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- CARDFILE
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- The User's Guide references the files CARDFILE.DAT and several
- files with an IDX extension. These files are created by the
- CARDFILE program when you first enter data. They are not included
- on any of the Concurrent diskettes and are not required to be
- present before running CARDFILE.
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- PRINTER MANAGER
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- This utility does not accept paths to files. Use Concurrent's
- "floating drives" for equivalent functionality.
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