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| Test point | Waveform |
|---|---|
| General | |
| R44 | 5.5V sinewave 9.8304 MHz (MCK) NOTE: Before attempting to measure this signal, refer to the CAUTION on page 4.4 |
| C18 | 5.2V sinewave 25.6 KHz |
| T24 | Collector 5.2V squarwave squarewave 25.6 KHz (SCK) |
| C21 | 40 uS reset pulse, negative going (press Reset switch) |
| T25 | Collector +5.0V sense line (SNS) |
| C14 | +2.4V (LP) |
| IC1 | |
| Pin 6 | Squarewave 5.5V 3.2768 MHz (Z80 clock) |
| Pin 11 | +5.5V |
| Pin 16 | Negative going 5.5V pulses, 100 Hz (/INT) |
| Pin 17 | Negative going 5.5V pulses, 100 Hz (/NMI) |
| Pin 18 | Negative going 5.5V pulses, 100 Hz (/HALT) |
| Pin 20 | Negative going 5.5V pulses, 100 Hz (/IORQ) |
| Pin 26 | Negative going reset pulse, (/RST, press Reset switch) |
| Display SK5 | |
| Pin 1 | +5.5V |
| Pin 3 | -6.6V to -10.5V variable by RV1 |
| Pin 4 | +5.5V pulses, 300 nS pulse width, period 156 uS |
| Pin 5 | 5.5V squarewave 50 Hz (FR) |
| Pin 6 | +5.5V |
| Pins 8,11,12,13,14 | Data |
| Pin 9 | 5.5V squarewave 3 MHz (display shift clock, XSCL) |
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