| pin | name | direction | description | color |
| 1 | TEXT | | Video text signal from TMG; set to inverse of GR, except in double high-resolution mode. | |
| 2 | 14M | | 14M master timing signal from the system oscillator. | |
| 3 | SYNC* | | Displays horizontal and vertical synchronization signal from IOU pin 39. | |
| 4 | SEGB | | Displays vertical counter bit from IOU pin 4; in text mode, indicates second low-order vertical counter; in graphics mode, indicates low-resolution. | |
| 5 | 1V SOUND | | One-volt sound signal from pin 5 of the audio hybrid circuit (AUD). | |
| 6 | LDPS* | | Video shift-register load enable from pin 12 of TMG. | |
| 7 | WNDW* | | Active area display blanking; includes both horizontal and vertical blanking. | |
| 8 | +12V | | Regulated +12 volts DC; can drive 300mA. | |
| 9 | PRAS* | | RAM row-address strobe from TMG pin 19. | |
| 10 | GR | | Graphics mode enable from IOU pin 2. | |
| 11 | SEROUT* | | Serialized character generator output from pin 1 of the 74LS166 shift register. | |
| 12 | NTSC | | Composite NTSC video signal from VID hybrid chip. | |
| 13 | GND | | Ground reference and supply. | |
| 14 | VIDD7 | | From 74LS374 video latch; causes half-dot shift high. | |
| 15 | CREF | | Color reference signal from TMG pin 3; 3.58 MHz. | |