Fujitsu serial number date codes
Overview
Format
Fujitsu used multiple serial number formats. The “main sequence” format appears is as follows:
ymsssss(t)
The positions have the following interpretations:
- y
- Year of production (A–Z); see under examples below
- m
- Month of production (0–9, X–Z); see table below
- sssss
- Running digits (four up to around 1984, and five from around 1985 onwards; external serial numbers can have six running digits)
- t
- A suffix letter, not explained; often “t”, but “e” has also been seen
The year is represented with a single character, using every letter of the alphabet, and wrapping around from Z back to A in 1985. It has been confirmed for the year range 1980–2010. See 富士通の板バネ式メカニカルキーボードについてのまとめページ -- 各種考察 for more details.
The month codes are as follows:
Letter | Month |
---|---|
1 | January |
2 | February |
3 | March |
4 | April |
5 | May |
6 | June |
7 | July |
8 | August |
9 | September |
X | October |
Y | November |
Z | December |
The datasheet for FKB4701 Series confirms the month codes and the year range from P (2000) to Z (2010).
Internal and external serial numbers
Many Fujitsu keyboards use separate serial numbers internally and externally. In these cases, the main sequence serial number is recorded on the internal label affixed to the PCB. Where there is only an external serial number, this may also follow the main sequence (as with FKB4700 models), but often it does not. External serial numbers may use a prefix letter and still not match. A number of mismatching examples could be found on rzwv’s site, but that has since been deleted, along with all the serial numbers. The mismatching examples tend to be membrane keyboards.
Examples
The confirmed date range for the main sequence so far is given below.
Prefix | Year | Keyboard | Switch | External serial | Internal serial |
---|---|---|---|---|---|
V | 1980 | N860-8282-T002 (claimed to be 1979, and the switches appear to be marked October and December 1979) | FES-8 | — | V30183 |
W | 1981 | ||||
X | 1982 | Fujitsu Micro 8 (“jpspace”) (ICs are dated late 81) | FES-360 | — | X29296 |
unknown (ICs are dated late 81/start of 82) | FES-360 | 11820381 | X30616 | ||
Fujitsu Micro 16s keyboard | DIN-compliant dual-discrete leaf spring | XX0005 | X90005 | ||
Y | 1983 | Epson Q703C-AA (HaaTa) | Dual-discrete leaf spring | Y55690 | |
Z | 1984 | Sony OA-S3400 keyboard | FES-4 | — | Z53677 t |
A | 1985 | Fujitsu FM77AV keyboard (“jpspace”) | Semi-discrete DIN leaf spring | AZ11755 | — |
B | 1986 | ||||
C | 1987 | ||||
D | 1988 | Fujitsu FMR30KB501 (MouseFan) | DIN-compliant dual-discrete leaf spring | P8Y03855 | DY03767t |
Fujitsu FMR-30BX keyboard (Kiyoto) | Non-discrete membrane leaf spring | D202053 | |||
Fujitsu FMR60KB101 JISキーボード (Kiyoto) | Unspecified leaf spring | Prohibited | DX69979t | ||
Fujitsu FACOM6130KF1 キーボード (Kiyoto) | Unspecified leaf spring | Prohibited | D335370t | ||
E | 1989 | MAI VDT keyboard | Non-discrete membrane leaf spring | E201649 | |
Fujitsu FMR60KB211 親指シフトキーボード (Kiyoto) | Unspecified leaf spring | Prohibited | E505675t | ||
Fujitsu FACOM6140KA1 キーボード (Kiyoto) | Unspecified leaf spring | Prohibited | EX23375t | ||
F | 1990 | ||||
G | 1991 | ||||
H | 1992 | Triumph FKB4700 (klikkyklik) | Peerless type 2 | H1390872 | — |
Escom FKB4804-103 (niubio) | Plug and toilet | H7075277 | — | ||
Fujitsu FMT-KB207 親指シフトキーボード (Kiyoto) | Unspecified leaf spring | Prohibited | HZ05970t | ||
I | 1993 | My own unbranded FKB4700 | Peerless type 2 | I6005425 | — |
J | 1994 | Fujitsu OAKB-406 (MouseFan) | DIN-compliant dual-discrete leaf spring | 175835 | J600023t |
K | 1995 | Fujitsu FMV-KB211 (sandy55) | DIN-compliant dual-discrete leaf spring | 34239 02B | KZ22648t |
Fujitsu FMV-KB211 親指シフトキーボード (Kiyoto) | Unspecified leaf spring | Prohibited | K715550t | ||
Fujitsu OAKB-201 (Kiyoto) | Unspecified leaf spring | Prohibited | K673183t | ||
L | 1996 | Fujitsu F7956KB1 (“jpspace”) | Post-Peerless | 1479+L801859 | L801888e |
M | 1997 | Fujitsu FKB8726-353 (niubio) | Dome with slider | M9058886 | — |
N | 1998 | ||||
O | 1999 | ||||
P | 2000 | Fujitsu FKB4725-501 (rzwv) | Peerless type 2 | PZ294887 | — |
Q | 2001 | ||||
R | 2002 | ||||
S | 2003 | ||||
T | 2004 | ||||
U | 2005 | Fujitsu FMV-KB611 (親指シフト) (Kiyoto) | Unspecified leaf spring | Prohibited | UZ15043s |
V | 2006 | ||||
W | 2007 | ||||
X | 2008 | ||||
Y | 2009 | ||||
Z | 2010 |