Editing Diagnostic Serial Console (section)

=== Response Code Interpretation ===

The console returns hexadecimal response codes that provide detailed diagnostic information:

{| class="wikitable" style="width:100%; text-align:left;"
|+ '''Diagnostic Response Codes and Meanings'''
|-
! Response Code !! Meaning !! Technical Interpretation
|-
| <code>004000000000</code> || 4MB memory detected || 00400 = 4,194,304 bytes, trailing zeros = diagnostic metadata
|-
| <code>0000FFFF000E</code> || Slots 1-2 populated || Bit pattern indicating SIMM presence in Bank A front positions
|-
| <code>FFFF000000E</code> || Slots 3-4 populated || Bit pattern indicating SIMM presence in Bank A rear positions
|-
| <code>000000800000*R</code> || 8MB boundary access error || Attempt to access unmapped 8MB address space during testing
|-
| <code>FFFFFFFF0005*R</code> || External addressing test failed || Error code 0005 indicates addressing capability beyond installed memory
|-
| '''0F000D''' || NMI button pressed during boot || Normal indication of interrupt button activation
|}