=How to Decode the CPC serial number=
This legend will help you define the month and year your CPC rolled out of the factory, as well as the factory itself.
There are two main types of serial number on the back of CPC:
*The first type is located on a small white label. Format is "123456 Kxx-yy"
*The second type is shown directly on the main label and consists of ten digits.
<u>Interpretation of the first type:</u>
"123456 Kxx-yy"
*K is the country of production (K for Korea - South Korea)
*Xx is the plant (31 or 32 are the two codes that typically found).
*Yy is the year and month of leaving the factory. First digit represents the year (4 for 1984, 5 for 1985), second digit represents the month (1 through 9 = January-September, X, Y and Z= October, November and December)
*Finally, the 6-digit number is the actual serial production sequence number fr that factory and year
Examples:
*93132 K32-54 => Korea factory 32 - April 1985 (a 664)
*218 167 K32-5X => Korea Factory 31 - October 1985 (a 6128)
*16201 K31-62 => Korea factory 31 - February 1986 (464)
This numbering was used until February 1986. It relates to a package of 464, 664 and every part of 6128.
<u>Interpretation of the 2nd type:</u>
10 digits (often with a dash between the 3rd and 4th digits)
*1st digit country code (5 for Korea, Thailand for 6)
*2nd and 3rd digit = plant code (found: 31 and 32 but also 33, 35, 41 and 71 for Thailand)
*4th and 5th digits (possibly preceded by a hyphen) = production date (year and month as in the previous system)
*5-end correspond to the sequence number of the chain of production (per site per month now)
Examples:
*5326604065 => Korea Factory 31 - June 1986 (it's a 6128)
*533-7316093 => Korea Factory 31 - March 1987 (it's a 464)
*671-9408078 => Thailand Factory 71 - April 1989 (it's a 6128)
=Boards=
== CPC464 Prototype ==
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== Notes ==
* The last letter of the '''PT NO Znnnnn, MCnnnnX''' board numbers does not seem to indicate a revision (the boards appear to be identical regardless of that letter, as long as the other digits are same). So, the last letter may indicate the manufacturing date or manufacturing location.
== To Do ==
* http://cpcwiki.eu/forum/index.php/topic,678.msg9509.html#msg9509 - some more precision values for Mainboard sizes. Add them to this page!
== See also ==
* [[Amstrad part numbers]] - Part Numbers for PCBs and Chips
* [[Service Manuals]] - (cost-down 6128 is in the Amendment manual)
== Forum ==
* http://cpcwiki.eu/forum/index.php/topic,678.0.html - CPC Mainboard Versions related