Editing Amstrad CPC 464 Maintenance Guide (section)

== Identifying Your Board Revision ==

The CPC 464 main PCB went through four revisions identified by the silkscreen part-number marking. The chip set and capacitor positions differ between revisions, so identification is the first step before any work.

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{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+'''Amstrad CPC 464 main PCB revisions'''
! Revision !! Silkscreen part number !! Form factor !! Gate Array !! Keyboard cable
|-
| Original (1984) || Z70100 / Z70100 &mdash; MC0001A || Full size || 40007 (Ferranti, heatsinked) || Discrete wires
|-
| Revision 1 (1984) || Z70200 &mdash; MC002B / MC002D || Full size || 40007 or 40010 (CMOS) || Ribbon cable
|-
| Revision 2 (~1986) || Z70373 / Z70374 &mdash; MC004B / MC0044A || Half size || 40007 or 40010 || Ribbon cable
|-
| Revision 3 / "cost-down" (~1988) || 28032? &mdash; MC0099 || ~1/4 size || 40226 (combines GA + CRTC + glue) || Ribbon cable
|}

Original and Revision 1 boards have ICs in DIL sockets; Revision 2 and 3 boards typically have the ICs soldered directly. The Revision 3 board is the most compact and uses the combined 40226 ASIC, which is the same ASIC family that appears in the 6128 and the cost-reduced [[Amstrad CPC 464|464]]/6128 Plus.