[jaustin]

Glad you like the Universal Hex format! And thanks for the headsup on the SVG - we noticed it earlier and there's a fix on the way through the site build(though whether you get 'Male code' or just bad kerning seems weirdly system dependent). Fix via https://github.com/microbit-foundation/dev-docs/pull/168 :D

[adolph]

Is there a file size difference with the Universal Hex that impacts how much code can be delivered?

[jaustin]

Thankfully not - the file gets larger but as there's an MCU managing the writing to flash, it selects the right binary for the appropriate device.

There are some limitations around ensuring backwards compatibility: if you want to write a program that runs on both devices, you have to adhere to the constraints of the smaller one - but I think it's a fair tradeoff!