Editing Diagnostic Serial Console (section)

=== Preprogrammed Diagnostic Test Commands ===

{| class="wikitable" style="width:100%; text-align:left;"
|+ '''Critical Test Commands'''
|-
! Command !! Test Description !! Technical Details
|-
| <code>*T</code> || Runs preprogrammed diagnostic tests. Use with specific codes to run targeted tests. || Base command for accessing ROM-based diagnostic routines
|-
| '''*T0000''' || No operation (null test) || Verifies command interface without hardware interaction
|-
| '''*T0001''' || '''Data Bus Test''' – Tests the 32 data lines (D0-D31) || Writes patterns like 0x00000000, 0xFFFFFFFF, 0xAAAAAAAA, 0x55555555 to verify physical data connections
|-
| '''*T0002''' || '''Mod3 RAM Test''' – Algorithmic memory testing || Performs modulo-3 pattern testing requiring full address space access, fails at 8MB boundary on 4MB systems
|-
| '''*T0003''' || '''Address Line Test''' – Verifies RAM addressing capability || Tests address line integrity using walking bit patterns, verifies each address line can be driven independently
|-
| '''*T0004''' || '''ROM Checksum''' – Verifies ROM integrity || Calculates and verifies ROM checksum, errors indicate corrupted or damaged ROM
|-
| '''*T0005''' || '''Reverse Mod3 RAM Test''' – Inverse algorithmic testing || Reverse pattern of T0002, also fails at 8MB boundary due to address space limitations
|-
| '''*T0006''' || '''Extra RAM Test''' – Extended memory validation || Tests memory beyond base configuration, typically crashes when accessing unmapped address space
|-
| '''*T0007''' || '''ModInv RAM Test''' – Memory inversion pattern testing || Tests memory inversion patterns, typically passes as it stays within smaller address ranges
|-
| '''*T0008''' || '''Front Desk Bus Test''' – Verifies access to Front Desk Bus components || Tests communication with peripheral components
|-
| '''*T0009''' || '''NuBus Access Test''' – Ensures NuBus communication is functional || Validates NuBus slot communication (SE/30 PDS equivalent)
|-
| '''*T000A''' || '''SCSI Chip Test''' – Confirms proper operation of SCSI controller || Tests SCSI controller functionality and register access
|-
| '''*T000B''' || '''IWM Chip Test''' – Verifies floppy drive controller functionality || Tests Integrated Woz Machine floppy controller
|-
| '''*T000C''' || '''SCC Chip Test''' – Tests Serial Communications Controller || Validates serial port hardware operation
|-
| '''*T000D''' || '''VIA Access Test''' – Checks VIA chip operation || Tests Versatile Interface Adapter functionality
|}