80ColumnCard
btb
An Apple II 80-Column Card. Based on the Videx Videoterm
Components (38)
| Reference | Value | Description |
|---|---|---|
| Q1 | 2N3904 | |
| U1 | 74LS86 | |
| U2 | 74LS02 | |
| U3 | 2758/'16/'32 | |
| U3W28,U20B1 | '64 - '512 | |
| U4 | 74LS04 | |
| U5 | 74LS245 | |
| U6 | 74LS00 | |
| U7,U8 | 4013 | |
| U9 | 74LS139 | |
| U10,U10W24 | 6116 | |
| U10N28,U10W28 | '32 - '256 | |
| U10N32,U10W32 | '512 | |
| U14-U16 | 74LS157 | |
| U18 | 74LS273 | |
| U19 | MC6845 | |
| U20 | 2732 | |
| U21 | 74LS166 | |
| U22 | 74LS175 | |
| U23 | 74LS161 | |
| C1,C5 | .1uF | |
| C2 | .1nF | |
| C3 | 1nF | |
| C4 | not placed | |
| CR1 | 1N4148 | |
| J1 | Apple II Expansion Bus | |
| J2 | VIDEO & LIGHT PEN | |
| R1,R2 | 220 | |
| R8 | 1K | |
| R9 | 1.5K | |
| R10 | 2K | |
| R11 | 10 | |
| R12 | 150 | |
| R13 | 200 | |
| X6 | CHAR INV | |
| X7 | SCREEN INV | |
| X21 | A11/WE | |
| Y1 | 17.430 MHZ |