Computermuseum der Fakultńt Informatik deutsch franšais
Manufacturer: Digital Equipment Corporation Type: VT55 Year: 1976 Technology: TTL, custom ÁP made from PALs and ROMs 2K RAM
Compared with the HP 2644 the DEC VT55 is a dreadful piece. In fact, it is also equipped with a 'microprocessor' but it is built mainly from some ROMs and PALs. The VT55 is a VT52 terminal with an additional graphics capability. This capability consists of two memories of 256 bytes each. With that two horizontal lines like on a two-channel oscilloscope could be drawn on the screen in addition to the text; hence the name 'decscope'. A printer could be incorporated into the case as an option. Later on, DEC equipped some of their terminals with different microprocessors: a VT52 with an IM6100 became a VT78 (a PDP8 compatible computer); there have also been terminals with LSI-11 processors.
back to the home page