Editing Acorn Archimedes A3000 Maintenance Guide (section)

== Identifying your board ==

The A3000 main PCB is marked with a part number and issue. Two are common: '''0280,000 Issue&nbsp;A''' (early boards, with the VL2333-QC ARM2) and '''0180,000 Issue&nbsp;3''' (later boards, VL86C010-10QC ARM2).<ref name="chris">Whytehead, Chris. [https://chrisacorns.computinghistory.org.uk/Computers/A3000.html "BBC A3000"], Chris's Acorns / The Centre for Computing History. Source for the board issues (0280,000 Issue A, 0180,000 Issue 3), the chip set (ARM2, MEMC1a, VIDC1a "Arabella", IOC, Intel 8051 keyboard controller, VL1772 FDC), the battery-corrosion observation, the model list (AKB01 etc.) and the Citizen OSDC-65C drive.</ref>

<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+'''Acorn A3000 main components'''
! Function !! Device !! Designator
|-
| CPU || ARM2 (VL2333-QC / VL86C010-10QC) @ 8&nbsp;MHz || IC37
|-
| Memory controller || MEMC1a (VL2304A / VL86C310) || IC44
|-
| Video controller || VIDC1a (VL2303A "Arabella" / VL86C110) || &mdash;
|-
| I/O controller || IOC (VL2311 / VL86C410) || IC13
|-
| Keyboard controller || Intel 8051 || &mdash;
|-
| Floppy controller || VLSI VL1772-02PC || &mdash;
|-
| DRAM (1&nbsp;MB) || 8 devices, in pairs by address || IC20&ndash;IC27
|-
| RISC OS 2 ROMs || 4 × ROM (512&nbsp;KB) || IC14&ndash;IC17
|-
| Master clock || 24&nbsp;MHz crystal || X3 (osc IC47, test point LK28)
|}