64 lines
2.8 KiB
Plaintext
64 lines
2.8 KiB
Plaintext
AST RESEARCH TECHNICAL BULLETIN TB-0180 5-12-86
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AST-5251/MODEL 12 VERSION 3.3 WITH IBM SYSTEM/34
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The information contained in this Technical Bulletin pertains to
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the AST-5251/Model 12, installed in an IBM Personal Computer,
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that has established connection with an IBM System/34 via
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synchronous modems through a dial-up line.
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Under the following conditions, a situation can arise whereby the
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PC could exhibit these symptoms:
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Symptoms:
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1. The display screen will go blank.
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2. The "System Available" indicator will stay highlighted.
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3. Any input from the keyboard will generate an error code
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#0099 and the "Input Inhibit" indicator will be turned
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on. Hitting the error reset key will clear the error
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message. However, any input from the keyboard will still
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generate the error code.
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Conditions:
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1. The PC is in emulation mode when a termination
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request is executed.
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2. There are print jobs still outstanding in the
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System/34's spoolfile when the termination request
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was executed.
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These symptoms occur due to the fact that the System/34 is
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expecting the spoolfile to be cleared or reset before it
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terminates the connection. In order to bring the PC out of this
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"loop", a shift-shift-ESC key sequence is needed. This will
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bring the PC back to DOS. At this point in time, all previously
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established connections with the System/34 will be lost, and
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normal dial-up procedures are required to bring the PC back on-
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line. It is also important to note that an IBM-5251/Model 12
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will respond in a similar manner given the identical scenario.
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The suggested solutions to this particular problem are as
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follows:
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1. Before attempting to execute a termination request,
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check the System/34's spoolfile for any outstanding
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print jobs. If there are print jobs in the spoolfile
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be sure to clear it, and then execute the termination
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request.
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2. If step #1 is not convenient, then the shift-shift-
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ESC key sequence previously mentioned is required.
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This will bring the PC back to DOS. When this
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procedure is taken, the System/34 will generate an
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SDLC error indicating that it has lost communication
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with the terminal. This System/34 error has to be
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answered before proceeding any further. Now with the
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previous connection terminated, normal dial-up
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procedures are required to bring the PC back on-line.
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