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The Model 8510A Prowriter is arugged and reliable dot matrix printerthat works well with the TI home computer computer system. During the test periodfor this review. using such programsas TI-Writer, Microsoft Multiplan,Personal Record Keeping and othersoftware that makes use of a printer, itoperated without any modifications,either to the printer, the computer orthe software. ===Performance: === This 80-column printer printer has a number of features that I didnot expect to see in the under-$400bracket. The user may choose to useperforated (fan-fold) paper, roll paperor plain. , single-sheet typing paper.The printer comes with a choice of sixlanguages (including Greek), severaltype fonts (compressed, pica, elite,proportional and elongated) and a bitimage graphics mode. The machineuses a cloth ribbon that comes in acartridge. The user may operate the paper feedforward or reverse. The machine willprint an original and up to threecopies. according to the manufacturermanufacturer. It does not seem to accept anything anything as thick as an envelope, howeverhowever. The machine can accomodateaccommodate paper up to 10 inches wide. The alphanumeric character formatis 7 dots horizontal by 9 dots vertical.The bit image graphics mode uses an8x8 matrix. The machine comes standard with aparallel interface. A serial interface isavailable at an extra charge. The printer printer comes with a l kilobyte buffer, buta 3K buffer is also available at an extracharge. The manufacturer says itoperates at a speed of up to 120 characters characters per second in the bidirectionalmode. DIP switches allow the user toselect bidirectional or unidirectionalprinting.