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