To see ROM version, press [SHIFT]+[7]+[ON], [9], then [SHIFT] x 5.
| model | ROM version | descriptions |
|---|---|---|
| fx-JP900 | CY-243 VerA (SUM A0B7) CY-243 VerF |
CLASSWIZ series high end model for Japanese market |
| fx-JP500 | CY-241 VerA CY-241 VerB (SUM A340) |
CLASSWIZ series entry model for Japanese market |
| fx-375ES A | CY-857 VerA (SUM A4DB) | Refreshed model of fx-375ES whose design language is the same as fx-JP* series |
| fx-520AZ | LY719X VerA | Japanese education model mainly for highschool students, natural-V.P.A.M. |
| fx-510AZ | GY-467 VerA | Japanese education model mainly for highschool students, natural-V.P.A.M. |
| fx-993ES | GY-467 VerA | high end standard scientific calculator, natural-V.P.A.M. |
| fx-72F | AY-346 VerA | SUPER-FX PLUS programmable scientific calculator, 2 lines (dot matrix + 7 segments) |
| fx-3650P | 24 PRG13 | SUPER-FX programmable scientific calculator, 2 lines (dot matrix + 7 segments) |
| fx-915ES | LY718X VerA | high-end standard scientific calculator, natural-V.P.A.M. |
| fx-373ES | GY-456X VerB | entry model standard scientific calculator, natural-V.P.A.M. |
| fx-370ES, fx-912ES | ROM 018 | standard scientific calculator, natural-V.P.A.M. |
| HP 10s (CASIO OEM?) | 05 6 | 2-lines scientific calculator |