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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Double keystroke input
PROBLEM - customer will see a double key stroke from the keyboard rather than the normal
single stroke of the key. In some applications, the double key strokes are over the entire
set of keys, in others, only selected keys are affected.
Machines AFFECTED - Valuepoint 6382, 6384, and 6387 systems.
SOLUTION -
The cause of the failure has been determined to be in the Mariner chip by Texas
Instruments.
Temporary work around - In some applications (such as a modem application software
by Andrews corp) a workaround is to disable the L2 cache (if equipped with one).
NOTE: This workaround may not work in all cases.
Permanent fix - The permanent fix is that a F/F was replaced by a latch in the TI
Mariner chip. The Mariner chip with the permanent fix has an IBM P/N of 71G5995.
To verify that the customer indeed has the above symptoms as a result of the TI Mariner
chip, the covers should be opened and the TI Mariner chip should be inspected. The Mariner
chip is the chip located to the left of the power connector. Some boards may have a VLSI
chip, others a TI chip.
The double keystroke problem is caused by the TI chip with IBM P/N of 52G7803 and
71G2872. VLSI chips do not contribute to the failure.
Other applications which are known to cause double keystroke problems are
o Carbon copy
o PC anywhere
o Brooklyn bridge
o KS keyboard driver used with the NCP 3270 emulator card (with the himem.sys not
loaded in the CONFIG.SYS file).
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