dbercel%toto@Sun.COM (Danielle Bercel, MIS Systems Programming) (05/20/87)
A friend of mine gets an 201 error (memory error) during the
startup test. The chip identification number is:
0480
Can anyone tell me which chip this is identifying?
Thanks in advance - danielle
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In article <19318@sun.uucp> dbercel@sun.UUCP (Danielle Bercel, MIS Systems Programming) writes:
]A friend of mine gets an 201 error (memory error) during the
]startup test. The chip identification number is:
] 0480
]Can anyone tell me which chip this is identifying?
The way to determine this is to read the BIOS listing in the IBM Technical
Reference. I figgered it out once when I had a bad chip, and promptly forgot
it after I replaced the bad chip. I do remember that it is pretty easy to
figure out, even though IBM's code is not commented as to the encryption
scheme used.chapman@acf4.UUCP (Gary W. Chapman) (05/21/87)
There is a nice book entitled "IBM PC Troubleshooting & Repair Guide" by
Robert C. Brenner from SAMS publishers, which provides a lot of useful
troubleshooting information for PCs. The following chart is provided for
diagnosing memory chip failures:
xx xx 201
System Board Memory Failed Chip
(Bank xx)
00 = Bank 0 00 = Parity
04 = Bank 1 01 = D0 chip
08 = Bank 2 02 = D1 chip
0C = Bank 3 04 = D2 chip
08 = D3 chip
10 = D4 chip
20 = D5 chip
40 = D6 chip
80 = D7 chip
Thus for error message 04 80, the chip is in bank 1, chip D7.
My XT has the banks labeled, with bank 0 closest to the rear of the machine;
the parity chip is the leftmost chip in each bank.
-- Gary Chapman (chapman@nyu-acf1.arpa)