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 # Macintosh Classic II FPU card
 
-Add an FPU to your Macintosh Classic II. Switchable clock source between the system clock (16 MHz) and a crystal oscillator on the board (40 MHz should generally work).
+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).
+
+### Results
+
+The board dramatically improves the Floating Point performance of the computer.
+
+MacBench 1.0 results running @16 MHz (system clock):
 
 
-### Parts
-- 5-532955-8 (A34313-ND)
+When using an external 40 MHz oscillator, the Floating Point results improves a bit more (it's not proportional to the clock frequency as at some point the slow 16-bit bus becomes a limiting factor):
+
+
+### Order a PCB
+
+If you want to order a PCB directly, I have created a model on PCBWay:
+
+
+### Bill of Materials
+
+| Qty | Value           | Device             | Package              | Parts                                                  | Digikey reference             | 
+|-----|-----------------|--------------------|----------------------|--------------------------------------------------------|-------------------------------|
+| 1   |                 | MC68882FN40A       | PLCC68               | IC1                                                    |                               | 
+| 1   |                 | PLCC68 socket      | PLCC68               | IC1                                                    |                               | 
+| 1   |                 | TE 5-532955-8      |                      | J1                                                     | A34313-ND                     | 
+| 1   |                 | Pin Header 2.54mm  | 3 pins               | J2                                                     |                               |
+| 5   | 100nF X7R       | SMD capacitor      | 0805                 | C1-C5                                                  |                               | 
+| 1   | 10uF 10V        | Tantalum Cap       | A (3216)             | C6                                                     | 399-4788-1-ND                 | 
+| 1   | 51 ohm          | SMD resistor       | 0805                 | R1                                                     |                               | 
+| 1   | 40 MHz          | Crystal oscillator | DIP-8                | X1                                                     |                               | 
+
+(sorry, I had most components at hand, so I only have Digikey references for the rather specific ones)
 
 ### References