Use the Spectrum 128 style menu below to navigate to the various sections detailing the SCART cable.
The monitor socket of the Spectrum 128 is a female 8 pin DIN (type 45326) and the signals available are:
|
|
|
| Pin |
Signal |
Level |
| 1 | Composite Video | 75 ohm, 1.2V pk-pk |
| 2 | 0 Volts DC | 0V |
| 3 | Bright Output | TTL |
| 4 | Composite Sync | TTL |
| 5 | Vertical Sync | TTL |
| 6 | Green | TTL |
| 7 | Red | TTL |
| 8 | Blue | TTL |
|
The ULA in the Spectrum 128 outputs TTL level red, green, blue and sync signals and from these a TEA2000 Encoder video chip
produces a composite video signal. The TTL level signals are taken to the monitor socket via 68 ohm resistors and the composite video signal
is taken to the monitor socket via a 75 ohm resistor, as shown in the diagram below.
The Spanish version of the Spectrum 128 has identical circuitry but a different monitor socket pin out, which can be viewed
here.
