Strano che non ti sia comparso il mio sito!
http://zxspectrum.hal.varese.it/consigli.htm
cerca "Uscita Scart o composita da un +2A o un +3"
Il 05/04/2017 06:41, Giacomo Paganelli ha scritto:
Salve a tutti,
come posso fare a ottenere un segnale video composito dal mio ZX Spectrum +2A (grey)? Qui in Australia non usiamo prese RGB sulle nostre TV, solo HDMI e video composito.
Ho fatto un po' di ricerche su Google, e ho trovato una nota su http://www.secarica.ro/index.php/en/zx-zone/plus3-hardware#compositevideo :
/All 128K Spectrum versions (+128/+2/+2A/+3) are using the same
PAL coder circuit, TEA2000
<http://www.secarica.ro/zx/tea2000.pdf>, which drives the TV
modulator. On the +128 and +2 the PAL coder drives also a
(composite) video output. On the +3 and +2A this (composite) video
output circuit is missing./
/This composite video output diagram
<http://www.secarica.ro/zx/plus3_composite_video.pdf> shows the
original +128/+2 composite video output circuit, which can be
successfully used on any +3 (and +2A)./
/However, the same diagram includes a better alternative for the
video output, based on the TEA2014A
<http://www.secarica.ro/zx/tea2014a.pdf>, a circuit commonly used
in many TV sets for internal TV / external VCR switching./
/Note: on this drawing, the TEA2014A may well be replaced with
TEA2114 <http://www.secarica.ro/zx/tea2114.pdf>. In fact, TEA2114
has better electrical performance, but it may be also more
expensive. For the purpose of this application, there is no
particular reason for using it./
/On the original +128/+2, the composite video output is made
through pin1 of the RGB PERITEL connector. Although this solution
may also be applied to +3 (and +2A), I don’t recommend it. The
common standard for video connections are the BNC connectors (used
mostly in professional video equipments), or RCA connectors (used
mostly in consumer video equipments). This example
<http://www.secarica.ro/zx/plus3_rear_video_connector_outside.jpg> shows
the video BNC connector mounted on the rear of my original +3,
while a view of the solder part of the same BNC connector can be
seen in this other example
<http://www.secarica.ro/zx/plus3_rear_video_connector_inside.jpg>./
Vi sarei grato se poteste confermarmi che questa e' la migliore soluzione (a parte la ZXHD, che e' bella ma cara).
Grazie,
Giacomo
