Unlike most other Spectrum peripherals the TTX2000 S has a card edge connection like the Spectrum motherboard itself, and is connected via a 56 way ribbon cable. My adaptor was missing any cables or power supply so I use a 15 volt DC wall-wart. The power supply is specified as 18 volts AC, however this is rectified and regulated to 12 volts internally by an LM7812 so a DC supply may also be used. The rear of the case is an aluminium plate with holes for a power socket, expansion edge connector slot, antenna socket, and four multi turn tuning resistors. The front of the case is a plastic blanking plate bearing the product branding printed in white. The front and rear panels are loosely retained in slots moulded into the case halves. They appear identical to those used for the Prism VTX5000 modem. The top and bottom case halves are identical, and branded OEL. The adaptor is contained within an injection moulded plastic enclosure held together with four screws. The schematics provided were obtained through reverse engineering of the hardware and may contain errors! Hardware I will add further information about other versions of the hardware and their history if I find it. This page mostly deals with the TTX2000 S as that is the unit I own and have reverse engineered. Volex bought the design when OEL went into receivership in the wake of the collapse of Oric and Prism. It is a version of the OEL TTX2000 designed by Laurence Cook, and sometimes branded 4-DATA in partnership with Channel 4 Television. The Volex TTX2000 S is a broadcast teletext receiver for the Sinclair ZX Spectrum (16K and 48K models).
0 kommentar(er)
