Editing Acorn Archimedes A4000 Troubleshooting Guide (section)

== Functional tests (ARM250 Dealer Test Disc) ==

For a machine that is partly working, Acorn's functional test software isolates the fault by subsystem. The test disc runs, and reports on:<ref name="sm" />

<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:100%; text-align:left;"
|+'''A4000 functional tests and what they exercise'''
! Test !! Exercises
|-
| Audio test || VIDC sound output, the audio summing/filter stage and the headphone output
|-
| Battery-backed RAM test || CMOS RAM and its battery backup
|-
| Disc interface test || floppy controller and drive (needs a scratch disc)
|-
| IDE hard disc interface test || the on-board IDE interface and drive
|-
| Hard disc exerciser / initialiser || surface and seek behaviour; formatting
|-
| External port tests || parallel, serial and (if fitted) Econet
|-
| Joystick test || analogue joystick inputs (A3010)
|-
| Keyboard and mouse tests || keyboard matrix and quadrature mouse
|-
| Memory test || the 2&nbsp;MB (or 4&nbsp;MB) DRAM
|-
| Real-time test || the real-time clock
|-
| UHF modulator test / Video tests || RF output and the RGB/video modes
|}