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Fred Schoenbrun
February 25th, 2017, 12:59 PM
I have an IBM AT 5170 and received a 161 error " SET UP". I replaced the old IBM battery with a 6 volt alkaline battery pack.
Fortunately, I have the "Diagnostics for IBM Personal Computer AT " floppy diskette and performed the setup. I removed the floppy after
entering the setup options. The AT was rebooted and went into Basic.

However, when I started up the unit the next day the 161 error appeared.

I repeated the process to no avail.

Can any member advise what might be wrong?
1) Is the motherboard defective?
2) Can the hard drive be the issue?

Thanks to anyone who might provide a solution to the problem.
Fred

Stone
February 25th, 2017, 01:22 PM
Are you sure the battery is good?

Are you sure the battery is properly connected?

modem7
February 25th, 2017, 02:56 PM
The 161 error is described at [here (http://minuszerodegrees.net/5170/post_errors/5170_post_errors.htm)].

It is a battery related issue, usually caused by a low battery. Basically, the low battery results in a 'low battery' flag being set, and when the 5170 is powered on, the power-on self test sees the 'low battery' flag and displays "161-System Options Not Set-(Run SETUP)" as a result.

After the bad battery is replaced with new, executing the SETUP process completely (not aborting) clears the 'low battery' flag.

If you have a voltmeter (or multimeter), you could gain some confidence of your battery and its connection to the motherboard, by measuring the DC voltage on pin 24 of the CMOS/RTC chip on the motherboard, the big chip marked 'MC146818'. Per the diagram at [here (http://minuszerodegrees.net/images2/5170_battery_circuitry.jpg)], you expect to measure a voltage that is about 0.8V below battery voltage.


I repeated the process to no avail.
An alternative to the 'Diagnostics for IBM Personal Computer AT' floppy is GSETUP.EXE, available from the 'Setups' section of [here (http://minuszerodegrees.net/software/software.htm)]. Does the recurring 161 issue go if you use GSETUP.EXE ?

Something else to try is removing and refitting the battery, say 10 times. I expect that that would sufficiently clean any oxide build up on the pins of the motherboard's battery connector.


Can the hard drive be the issue?
Not for a 161 ('low battery' flag) error.


The AT was rebooted and went into Basic.
Going to BASIC is unrelated to a 161 error.