636 Chapter14
Analyzer Messages
Interpreting Analyzer Messages
The Video RAM Failure Code.
The last four digits identify the failure address for the video RAM on
the A16 assembly. A video RAM failure code indicates an internal
failure on the A16 assembly; the section of the video RAM circuitry that
is tested is not connected to other instrument assemblies. Convert the
four digits to binary and interpret them with Table 14-6.
Table 14-6 A16 Video Ram Address Failure Code Interpretation
Digits From
Example
Equivalent
Binary Value
A16 Circuit Tested A16 Reference
Designator
F → 8 Error at MAD 15 * U306
→ 4 Error at MAD 14 U305
→ 2 Error at MAD 13 U306
→ 1 Error at MAD 12 U305
8 Error at MAD 11 U306
7 → 4 Error at MAD 10 U305
→ 2 Error at MAD 9 U306
→ 1 Error at MAD 8 U305
8 Error at MAD 7 U306
4 Error at MAD 6 U305
2 → 2 Error at MAD 5 U306
1 Error at MAD 4 U305
D → 8 Error at MAD 3 U306
→ 4 Error at MAD 2 U305
2 Error at MAD 1 U306
→ 1 Error at MAD 0 U305
* The acronym MAD stands for “Multiplexed Address and Data.” There are
no separate address and data lines within the A16 video RAM.
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