Classic ii fpu
About the Classic ii fpu PCB
Classic ii fpu is an open source PCB design by dymczykm, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 68.6 × 65 mm, with 12 components from 7 distinct parts.
Other key parts include the MC68881FN. By type, the board carries 7 capacitors, 2 connectors, 1 IC, 1 crystal and 1 resistor.
From the project
FPU card for Macintosh Classic II.
This repo contains a KiCAD design of an expansion card that adds an MC68882 FPU to your Macintosh Classic II. The board has two layers to keep the PCB cost down. It offers a switchable clock source between the system clock (16 MHz, synchronous operation) and a crystal oscillator on the board (40 MHz, asynchronous operation; tested with MC68882FN40A, the rumours claim 50 MHz will work too).
Main components on the Classic ii fpu
Classic ii fpu bill of materials (BOM)
12 components, 7 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MC68881FN | PLCC-68_THT-Socket | IC1 |
| 1 | CXO_DIP8_40M | Oscillator_DIP-8_LargePads | X1 |
| 1 | Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | Conn_02x25_Odd_Even | TE_5-532955-8_Odd_Even | J2 |
| 6 | 100n | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C7 |
| 1 | 4u7 | CP_EIA-3216-18_Kemet-A_Pad1.58x1.35mm_HandSolder | C6 |
| 1 | 33 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
Classic ii fpu design files
The KiCad project lives in the dymczykm/classic_ii_fpu repository on GitHub; these links point at the commit this page was built from.
- Layoutfpu68882.kicad_pcb
Classic ii fpu: common questions
How big is the Classic ii fpu PCB?
The Classic ii fpu measures 68.6 × 65 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Classic ii fpu?
12 components, from 7 distinct parts. The full bill of materials is listed on this page.
Where can I download the Classic ii fpu design files?
From the dymczykm/classic_ii_fpu repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Classic ii fpu design in my own project?
Yes, under the terms of its GPL-3.0 license, which dymczykm chose for the repository.