was a bit wider as well, including thermal, impact, dot matrix, daisy wheel, 4-colour pen, printers of the type used in simpler printing calculators. Some calculators and pocket computers had external 3½ and 5¼ inch floppy drives, cables for connecting two cassette recorders, cradles containing a printer and/or cassette recorder into which the machine slid, and so on. It is also possible to connect some machines to certain electric typewriters for use as a printer (the typewriters are also able to be connected to PCs for this purpose, and the interface tends to be a standard RS-232 and/or DIN plug), and in some cases to access the typewriter's floppy or micro floppy drives. List of selected programmable calculators Casio Casio FX-502P series · Casio FX-602P series · Casio FX-603P · FX-702P · FX-850P · Casio 9850 series · Casio 9860 series · Casio ClassPad 300 Elektronika B3-21 · B3-34 · MK-61 · MK-52 Hewlett-Packard HP-19C ·HP-25 · HP-25C ·HP-28C ·HP-28S ·HP-29C ·HP-32S ·HP-32sII ·HP 35s · HP-41C · HP-41CV ·HP-41CX ·HP-42S ·HP-48SX ·HP-48G ·HP-48GX · HP-49 · HP-50 · HP-65· HP-67· HP-97 NumWorks Sharp Sharp PC-1350 · PC-1401 · PC-1403 EL-9600c · EL-9900 SwissMicros SwissMicros DM11 · SwissMicros DM12 · SwissMicros DM15 · SwissMicros DM16 · SwissMicros DM41 · SwissMicros DM42 Texas Instruments TI-51-III ·SR-52 ·SR-56 ·TI-57 ·TI-58 C · TI-59 · Galaxy 67 · TI-83 Plus · TI-84 Plus · TI-85 · TI-89 · TI-92 · Voyage 200 · TI-Nspire See also Calculator input methods Graphics calculator Pocket computer Scientific calculator References