Binary Synchronous Communications (Bsc) Error Log And History Table • 4·70; Errors. 4·70 - IBM 5110 Maintenance Information Manual

Bit 5-Diskette 2: Indicates that a diskette 2 is located in
the diskette drive. This line is tested after the index pulse
has been checked.
Bit 6-CRC Error: Indicates that the CRC read from the
diskette did not agree with the generated CRC.
Bit 7-ReadlWrite Overrun: Indicates that the processor
did not service an interrupt. Detection of an overrun
causes the adapter to reset to the access mode.
Status Byte B
Bit O-New Media: Indicates that the diskette drive cover
is open.
Bit 1-MFM Mode: Sets the adapter to the desired record-
ing mode.
1
=
MFM
0= FM
Bit 2-lnner Track Select (filter control): Sets the inner
track select (filter control) latch. 1=on
(>
track 60),
O=off
«
track-60). This latch is used with the inner
tracks bit to further compensate for bit shifting beyond
cylinder 60. The latch is only used during a read
operation.
Bit 3-lnner Tracks: Sets the inner tracks latch. 1 =on
(>
track 42), O=off
«
track 42). This bit is used on a
write operation to reduce the amount of recording current
beyond track 42. On a read operation this bit is used to
compensate for bit shifting beyond track 42.
Bit4-Head Engage: Indicates if the heads are loaded.
(1=Lower heads; O=Raise heads).
Bit 5-Head Selected: Indicates which side of the diskette
is being used. (1=side 1; O=side 0).
Bit 6-Access Lines: Controls the movement of the heads
from track to track.
Bit 7-Access Lines: Controls the movement of the heads
from track to track.
4-70
BINARY SYNCHRONOUS COMMUNICATIONS (BSC)
ERROR LOG AND HISTORY TABLE
Errors
Errors are recorded in an error log to assist you in deter-
mining the cause of intermittent BSC problems.
See Diagnostic Aids section of the IBM 5110 Binary
Synchronous Communications Feature Maintenance
Information Manual, SY31-0558.
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