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NEC has a pretty consistant model system for their computers - basically they start with the term PC for "Personal Computer", and then a two, three, or four digit number, followed by four numbers at the end that determine various modifyable attributes. For example, a NEC PC-440-1531, is a NEC Versa 40EC with a 250MB 2.5" VersaPak HDD module, 8MB of RAM (4MB Memory Card + 4MB on board), and a regular Color TFT Active Matrix 640x480p 9.4" LCD Panel.
You can also, at least on the 1990's products, tell the date of manufacture by the first digit of the serial#. Say you have a Versa P/75 and the serial is 57007204 - that's a 1995 build. This also can often be confirmed by various stamp and component dates inside the device. This seems to even work on eighties products as a NEC ProSpeed with a serial# of 9X00505HH would be likely a 1989 build. It seems very consistant.
| Model Number |
Model Name |
Type |
CPU |
RAM |
| PC-17-XX
| NEC UltraLite
| IBM Compat. PC Laptop
| NEC V30 7.16MHz
| 640K
|
| PC-21-XX
| NEC ProSpeed 286
| IBM Compat. PC Laptop
| i286
| 640K
|
| PC-22-XX
| NEC UltraLite 286F
| IBM Compat. PC Laptop
| i80286
| 1MB
|
| PC-41-XX
| NEC ProSpeed 386SX
| IBM Compat. PC Laptop
| i386SX
| 640K
|
| PC-44-XX
| NEC UltraLite SX/20
| IBM Compat. PC Laptop
| i386 SX 20MHz
| 2MB
|
| PC-47-XX
| NEC UltraLite III
| IBM Compat. PC Laptop
| i486 DX2 SL 40MHz
| 4MB
|
| PC-49-XXX
| NEC UltraLite SL/20
| IBM Compat. PC Laptop
| i486 DX SL 20MHz
| 4MB
|
| PC-120-XXXXX
| NEC Versa S/33
| IBM Compat. PC Laptop
| i486 DX SL 33MHz
| 4MB
|
| PC-400-XXXX
| NEC UltraLite Versa 20
| IBM Compat. PC Laptop
| i486 SL 20MHz
| 4MB
|
| PC-410-XXXX
| NEC UltraLite Versa 25
| IBM Compat. PC Laptop
| i486 SL 25MHz
| 4MB
|
| PC-420-XXXX
| NEC UltraLite Autograph (1992)
NEC VersaPad (1993+)
| IBM Compat. PC Laptop
| i486 SL 20MHz
| 4MB
|
| PC-430-XXXX
| NEC UltraLite Versa 33
| IBM Compat. PC Laptop
| i486 SL 33MHz
| 4MB
|
| PC-440-XXXX
| NEC Versa 40E
| IBM Compat. PC Laptop
| i486 DX2 SL 40MHz
| 4MB
|
| PC-450-XXXX
| NEC Versa 50E
| IBM Compat. PC Laptop
| i486 DX2 SL 50MHz
| 4MB
|
| PC-460-XXXX
| NEC Versa 75E
| IBM Compat. PC Laptop
| i486 DX4 75MHz
| 4MB
|
| PC-470-XXXX
| NEC Versa M/75 (non TC)
| IBM Compat. PC Laptop
| i486 DX4 75MHz
| 8MB
|
| PC-480-XXXX
| NEC Versa M/100 (non TC)
| IBM Compat. PC Laptop
| i486 DX4 100MHz
| 8MB
|
| PC-490-XXXX
| NEC Versa P/75
| IBM Compat. PC Laptop
| iPentium (586) 75MHz
| 8MB
|
| PC-570-XXXX
| NEC Versa M/75TC
| IBM Compat. PC Laptop
| i486 DX4 75MHz
| 8MB
|
| PC-580-XXXX
| NEC Versa M/100TC
| IBM Compat. PC Laptop
| i486 DX4 100MHz
| 8MB
|
| PC-700-XXXX
| NEC Versa V/40
| IBM Compat. PC Laptop
| i486 DX2 SL 40MHz
| 4MB
|
| PC-710-XXXX
| NEC Versa V/50
| IBM Compat. PC Laptop
| i486 DX2 SL 50MHz
| 4MB
|
| PC-720-XXXX
| NEC Versa V/75
| IBM Compat. PC Laptop
| i486 DX4 100MHz
| 4MB
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Decoding the "accessory numbers" (for a lack of better terms)
NEC has 2-5 digits after the model number to determine various things about the computer in question based upon those digits. These digits change from model to model as technologies grow and change.
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