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Apple II Memory card Diagnostics
- Subject: Apple II Memory card Diagnostics
- From: Wayne Stewart <waynes@intergate.ca>
- Date: Wed, 17 Jul 2002 21:33:06 -0700
- Newsgroups: comp.sys.apple2
- Organization: Posted via Supernews, http://www.supernews.com
- Xref: archiver1.google.com comp.sys.apple2:21406
Someone was asking about the Apple II memory card diagnostics
a short while ago. Ran accross this in my "notes" tonight. This
isn't much but it's more than what's in the manual.
Hope it isn't all gibbled up in the posting
------------------------------------------------------------------------
TITLE Article ID:1569
Created:
12/16/85
Apple II Memory Expansion Card: Diagnostics (11/96) Modified:
11/21/96
------------------------------------------------------------------------
TOPIC
This article describes the Apple II Memory Expansion Card
diagnostics. These
procedures can be used for any RAM configuration.
------------------------------------------------------------------------
DISCUSSION
Always verify the card size and the positioning of the ICs before running
the internal diagnostics.
A card failure is indicated if the internal dagnostics will not
run. In that
case, remove the RAM, install them on an exchange module, and retest.
1. Install the Memory Expansion Card in any slot except 3 in a
known good
Apple IIe. No disk drive is necessary.
2. Power on the Apple IIe.
The words Apple II will be displayed at the top of the screen.
The prompt
and cursor will be displayed on the screen in the upper left hand corner.
3. Enter CALL -151 and press RETURN. The monitor prompt, *, will appear.
4. Verify which slot the Memory Expansion Card is in by entering cX0AG,
where
X is the slot number, and press RETURN.
5. The following display will appear. Verify the card size (RAM
configuration) which appears is the actual size for the card
installed (in
this case a 256K card is installed). The dots appear on the
screen as the
card is tested. The test will repeat until an error is
encountered or the
ESC key is pressed.
MEMORY CARD TEST
ESC TO EXIT
TEST WILL TAKE 45 SECONDS Seconds: 45 90 135 180
CARD SIZE = 256K Card size: 256K 512K 768K 1024K
PASSES = 0001
....
....
....
....
....
....
CARD OK
Error Code Interpretation
-------------------------
The Memory Expansion Error Code Chart in the December 1985
mailing was
incorrect. This article and the January 1986 mailing contain a corrected
chart.
If an error is found during the internal diagnostic it will be
displayed in
one of the following formats: ADDRESS ERROR XXYYYY-ZZ or DATA ERROR
XXYYYY-ZZ. There are, in fact, 4 error situations: address error, data
error, non-existent RAM error, and card size error.
Address Error
-------------
An address error usually indicates a card failure. Remove all thecustomer's
RAM, install them on an exchange module, and run the test again.
Data Error
----------
Data errors usually indicate a RAM failure. The ZZ in the error code
specifies the section of the card where the error took place. The
XX in the
error code specifies the suspected faulty RAM within that
section. Ignore
the YYYY.
Memory Expansion Error Code Chart
---------------------------------
RAM locator Section
in specified section of card
|| ||
XXYYYY-ZZ
||||
ignore
Range of RAM Locator in specified
---------------------------------
Card Card Card
section Chip section Chip section
number number
ZZ XX ZZ
10 C1 0C - 0F A1 01
C2 08 - 0B A2
C3 04 - 07 A3
C4 00 - 03 A4
20 C5 0C - 0F A5 02
C6 08 - 0B A6
C7 04 - 07 A7
C8 00 - 03 A8
40 C9 0C - 0F A9 04
C10 08 - 0B A10
C11 04 - 07 A11
C12 00 - 03 A12
80 C13 0C - 0F A13 08
C14 08 - 0B A14
C15 07 - 04 A15
C16 00 - 03 A16
To locate DATA ERROR 08000 - 40 using the chart,
The bad chip is in section 40.
Card Chip
section number
ZZ
40 C9
C10
C11
C12
The bad chip is located where the RAM locator falls into the
range that
includes 08.
Range of RAM Locator in specified
---------------------------------
Card Chip Card
section number section
ZZ XX
40 C10 08 - 0B
The position of the bad chip is C10. Replace the RAM chip on the card.
A x x x x x x x x x x x x x x x x
B x x x x x x x x x X x x x x x x
C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Re-run the diagnostic.
Non-Existent RAM Error
----------------------
Any other section ZZ codes, for example 0B, 0E, FC, and so on, usually
indicate a card failure. Remove all RAM and install it on an exchange
module.
Other error codes might point to a RAM chip which is not
installed, for
example, if a 256K Memory Expansion Board gave an error of 0C0000
- 40,
change the RAM which is installed in that section. If the test
still gives
the same error message, change the RAM in the adjoining sections.
Card Size Error
---------------
If the actual card size does not correspond to the card size
listed on the
built-in diagnostic, you will need to exchange eight RAMs. For
example, if
the card size indicated on the internal diagnostic is 768K, and
the actual
RAM on the card is 1 megabyte, remove the RAM at locations A1,
C1, A5, C5,
A9, C9, A13, and C13. Reinstall known good RAM and run the diagnostics.
If the card size is now correct, there may be one or more bad ICs
among the
RAM removed. Replace the removed RAM one at a time, testing after each
installation, until the bad RAM is located.
If the card size is still incorrect, this will indicate a card failure.
Remove all the RAM and install it on an exchange module and retest.
Article Change History:
15 Nov 1996 - Reviewed for technical accuracy, revised formatting.