To facilitate developing new circuits for my 65816 system, I have designed an extension for my bus, leveraging the ISA physical connection on my motherboard. The extension consists of a pair of PCBs -- one that plugs into the motherboard and one that hosts an ISA connector. A pair of ribbon cables then connects the two. This allows me to work on add-in cards that are lying flat on my workbench, allowing easier access to probe and modify.
![](https://static.wixstatic.com/media/66a162_14c9d7fbf928484091d1364d5782402a~mv2.jpg/v1/fill/w_849,h_1176,al_c,q_85,enc_avif,quality_auto/66a162_14c9d7fbf928484091d1364d5782402a~mv2.jpg)
With shorter ribbon cables:
![](https://static.wixstatic.com/media/66a162_2c7ff81b33a34851b39f9b6f638ef0c0~mv2.jpg/v1/fill/w_980,h_1265,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/66a162_2c7ff81b33a34851b39f9b6f638ef0c0~mv2.jpg)
To further support development of new circuits, I have designed an add-in card that hosts a pair of breadboards. The card provides easy access to bus signals and power. This card and the extension above are going to come in handy!
![](https://static.wixstatic.com/media/66a162_e532b5b74b7243f696010eadba21ab5d~mv2.jpg/v1/fill/w_980,h_795,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/66a162_e532b5b74b7243f696010eadba21ab5d~mv2.jpg)
Source Files
While I offer no warranty or guarantee, you are welcome to modify/use my design files. I have posted both the source EasyEDA projects and the Gerber files to
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