Sinclair Research ZX Spectrum - Page 43

TABLE 4.1. IC14 (IML889) PIN SIGNALS
Pin No. Signal
1 (CHROMA LEAD) SINEWAVE BOOmV, 0.2yS, d.c. 9.5V
2 (R - Y INPUT)
3 (CHROMA BIAS) d.c. 4.8V
4 (B - Y INPUT)
5 0V (GROUND)
12 (VIDEO INPUT) d.c. 12V unreg.
13 (CHROMA SUBCARRIER)
14 (R.F SUPPLY)
15 (SOUND TANK) 'LINKED1 12V d>c-
16 (CHROMA SUPPLY
17 (CHROMA OSCILLATOR OUTPUT) SQUAREWAVE 0.2 us 4V P-P.
D.C. 0.8V
18 (CHROMA LAG) SINEWAVE BOOmV P-P 2 uS d.c. 9.5V
6,7,8 Not Connected
9,10,
11
NOTES: (1) Rails and signals taken on switch-on, computer
displaying 'Sinclair1 y
(2) No keys pressed
(3) All d.c. levels positive wrt 0V
4.18