Service Hints; Tape Status Byte Bit Description - Storage Address 008F - IBM 5100 Maintenance Information Manual

(
Service Hints
• Try to force the failure when running diagnostics by:
Vibrating the machine/ cards/ connections.
Raising the machine temperature (unplug the
blower).
CAUTION
00 not exceed 20 minutes.
Lowering the machine temperature (use a circuit
coolant).
• Machine power must be off when removing the
read/write storage cards (K2 through N2). All other
cards can be removed with power on.
• You can remove the following cards/devices if they
are not part of the failing operation or when trying to
isolate to a failing operation:
A2 - I/O Driver
B2 - Communications and serial I/O
APL cards C2, 02, 04, H4 if the failure is in
BASIC
BASIC card C4 if the failure is in APL
Read/write storage cards above 16K
5103 Printer
1506 Auxiliary Tape Unit
• You can swap either the parts of the tape units
(internal and auxiliary) or the complete tape units
(physically or electrically). To swap electrically, swap
the cable in the Z2 socket of the 5100 A1 board
(228) with the cable in socket B4 of the Auxiliary
Tape Unit (580). The internal tape unit address is
now E40 and the Auxiliary Tape Unit address is E80.
• To loop CMO 0:
Load and run CMO 0 until the first stop
Insert diagnostic cartridge
Hold CMO and press ATTN
Press A
Enter: 368C2B04
Press SPACE bar
Press A
Enter: 2B5831 BO
Press SPACE bar
Enter: BR2B04
Press EXECUTE
Tape Status Byte Bit Description - Storage Address
OOSF
Bit O-End of Tape (EaT): Indicates that anyone of six
holes in the tape (three at the beginning and three at the
end) generated EOT status.
Bit 1- No Device Address E Response: Indicates that
status bit 1 was not active.
Bit 2- Tape Running: Indicates that the forward or
reverse select magnets were selected.
Bit 3-Cartridge in Place: Indicates that the cartridge in
place switch is active.
Bit 4-Erase On: Indicates that either channel 1 or
channel 0 erase current was on.
Bit 5-LED and Erase OK: Indicates that the EOT and
BOT LEOs were conducting and that the erase coils did
not have an open circuit.
Bit 6-File Protected: Indicates that the file protect
switch was made.
Bit 7-No Beginning of Tape (1
=
No BOT): Indicates
that none of the top five holes in the tape generated
BOT status.
Intermittent Failures Troubleshooting Guide 3-77