diff --git a/README.md b/README.md index 182f88e..db83baa 100644 --- a/README.md +++ b/README.md @@ -4,12 +4,15 @@ This repo contains a KiCAD design of an expansion card that adds an MC68882 FPU ### Results -The board dramatically improves the Floating Point performance of the computer. +After plugging in the card, it should be immediately visible in some tools (here System Information of MacBench): +![FPU card present in System Information](img/classic_ii_system_info.png) -MacBench 1.0 results running @16 MHz (system clock): +The board dramatically improves the Floating Point performance of the computer. MacBench 1.0 with an FPU@16 MHz (system clock) reports over a 13x improvement. +When using an external 40 MHz oscillator, the Floating Point result goes up even a bit more - to 15.7x (it's not proportional to the clock frequency as at some point the slow 16-bit bus becomes a limiting factor): +![FPU benchmark showing Floating Point improvements](img/classic_ii_benchmark.png) -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): +(look at the Floating Point row) ### Order a PCB @@ -32,6 +35,14 @@ If you want to order a PCB directly, I have created a model on PCBWay: (sorry, I had most components at hand, so I only have Digikey references for the rather specific ones) +### Pictures + +![FPU top](img/IMG_3241.jpg) + +![FPU bottom](img/IMG_3249.jpg) + +![FPU installed](img/IMG_3247.jpg) + ### References The MC68000 KiCAD library from https://dev.sigpipe.me/DashieElectronics/Jackalope