C128/C128D RAM EXPANDER TEST
VERSION 1.2.1
CUSTOM TEST PATTERN TESTING
The RAM Expansion Test Pattern Table is Located between 2261 and 2274
HEX (Inclusive). This table contains the Bit Patterns used for RAM
Expansion Testing.
If a different Test Pattern is desired ....
Insert Version 1.5 Diagnostic Diskette in Load Drive
Type DLOAD "C128 RAM XPANDER" Press RETURN
Type DLOAD "128D RAM XPANDER" Press RETURN
Type POKE 8801, (Enter Decimal Test Pattern) Press RETURN
Type RUN Press RETURN
* The RAM Expansion Test will now be executed using the Selected
Test Pattern.
EXTERNAL ROM TEST
Although the External ROM, (Location U18 of Expansion PCB), is not
currently used, the RAM Expansion Test includes a test to Detect
Failures on any ROM which may be used in the future.
The ROM is Tested by adding the contents of each address to a value
equal to the sum of the data in all preceding addresses. This is referred
to as a 'CHECKSUM' and the value is displayed, in HEX Format.
* The Displayed Checksum may change from one Pass to another as only
an Empty Slot is being read, however it should be consistent between
different RAM Expanders.
** A Checksum which is Not Consistent between different RAM Expanders
may Indicate a Defective PLA on Main PCB of the C128 or C128D.
* The System Must be Powered Down to Exit This Test
* C128 -
* C128D -
*
*
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