Not all BOOKMAN cards are compatible with all BOOKMAN platforms. Please
Card Number | Compatibility | Exceptions
Suffix
-----------------+--------------------------------------+-------------------------------
20XX, e.g. | ALL | * Speaking cards only speak in speaking models
DBE-2020 | | * Some cards only display 3 lines in a box in models that can
| | accommodate more lines
| | * BQC-2021, RMB-2030 & MBC-2036, don't work in 1440's models
-----------------+--------------------------------------+-------------------------------
30XX, e.g. | Platforms with model number suffix | NA
DBD-3040 | 1440, 1450, 1460, 1470, 1590, 1595, |
| 1660, 1770, 1840, 1845, 1850, 1860, |
| 1870 (BOOKMAN II & III) |
-----------------+--------------------------------------+-------------------------------
40XX, e.g. | Platforms with model number suffix | NA
ENC-4047 | 1450, 1460, 1470, 1660, 1845, 1850, |
| 1860, 1870 (BOOKMAN III) |