80ColumnCard
About the 80ColumnCard PCB
80ColumnCard is an open source PCB design by btb, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 155.2 × 78.6 mm, with 47 components from 42 distinct parts.
Other key parts include the 74LS86, 74LS02, 2758/'16/'32, '64 - '512 and 74LS04. By type, the board carries 26 ICs, 8 resistors, 5 capacitors, 4 crystals, 2 connectors and 1 transistor.
From the project
An Apple II 80-Column Card. Based on the Videx Videoterm
This EPROM can hold one or two of the 2K character sets. A12-A15 are all permanently tied high, so only the top 4K of the EPROM is usable. The standard character set (e.g. "videx std 7x9 - top right.bin") goes in the lower 2K of that space, and any desired alternative character set (e.g. "videx inverse - top left.bin") goes in the upper 2K of that space.
Main components on the 80ColumnCard
80ColumnCard bill of materials (BOM)
47 components, 42 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS86 | DIP-14_W7.62mm | U1 |
| 1 | 74LS02 | DIP-14_W7.62mm | U2 |
| 1 | 2758/'16/'32 | DIP-24_W15.24mm | U3 |
| 2 | '64 - '512 | DIP-28_W15.24mm | U3W28, U20B1 |
| 1 | 74LS04 | DIP-14_W7.62mm | U4 |
| 1 | 74LS245 | DIP-20_W7.62mm | U5 |
| 1 | 74LS00 | DIP-14_W7.62mm | U6 |
| 2 | 4013 | DIP-14_W7.62mm | U7, U8 |
| 1 | 74LS139 | DIP-16_W7.62mm | U9 |
| 1 | 6116 | DIP-24_W7.62mm | U10 |
| 1 | '32 - '256 | DIP-28_W7.62mm | U10N28 |
| 1 | '512 | DIP-32_W7.62mm | U10N32 |
| 1 | 6116 | DIP-24_W15.24mm | U10W24 |
| 1 | '32 - '256 | DIP-28_W15.24mm | U10W28 |
| 1 | '512 | DIP-32_W15.24mm | U10W32 |
| 3 | 74LS157 | DIP-16_W7.62mm | U14, U15, U16 |
| 1 | 74LS273 | DIP-20_W7.62mm | U18 |
| 1 | MC6845 | DIP-40_W15.24mm | U19 |
| 1 | 2732 | DIP-24_W15.24mm | U20 |
| 1 | 74LS166 | DIP-16_W7.62mm | U21 |
Show 22 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS175 | DIP-16_W7.62mm | U22 |
| 1 | 74LS161 | DIP-16_W7.62mm | U23 |
| 1 | 2N3904 | TO-92 | Q1 |
| 1 | CHAR INV | SolderJumper-3_Pie_Bridged23 | X6 |
| 1 | SCREEN INV | SolderJumper-3_Pie_Bridged23 | X7 |
| 1 | A11/WE | SolderJumper-3_Pie_Bridged12 | X21 |
| 1 | 17.430 MHZ | Crystal_HC18-U_Horizontal | Y1 |
| 1 | Apple II Expansion Bus | Apple II Expansion Edge Connector | J1 |
| 1 | VIDEO & LIGHT PEN | PinHeader_1x06_P2.54mm_Horizontal | J2 |
| 1 | 1N4148 | D_DO-35_SOD27_P10.16mm_Horizontal | CR1 |
| 1 | .1uF | CP_Radial_Tantal_D4.5mm_P6.35mm | C1 |
| 1 | .1nF | C_Axial_L2.6mm_D1.8mm_P6.35mm_Horizontal | C2 |
| 1 | 1nF | C_Axial_L2.6mm_D1.8mm_P6.35mm_Horizontal | C3 |
| 1 | not placed | CP_Radial_Tantal_D4.5mm_P6.35mm | C4 |
| 1 | .1uF | C_Axial_L2.6mm_D1.8mm_P6.35mm_Horizontal | C5 |
| 2 | 220 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 1 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 1.5K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 1 | 2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10 |
| 1 | 10 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11 |
| 1 | 150 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12 |
| 1 | 200 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
80ColumnCard design files
The KiCad project lives in the btb/80ColumnCard repository on GitHub; these links point at the commit this page was built from.
80ColumnCard: common questions
How big is the 80ColumnCard PCB?
The 80ColumnCard measures 155.2 × 78.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the 80ColumnCard?
47 components, from 42 distinct parts. The full bill of materials is listed on this page.
Where can I download the 80ColumnCard design files?
From the btb/80ColumnCard repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the 80ColumnCard design in my own project?
Yes, under the terms of its Apache-2.0 license, which btb chose for the repository.
