I was interested in understanding if from the point of electrical engineering storing the RAW data of the sensor directly into the memory of the camera require special hardware. Could be more expensive to implement a camera that store RAW format compared to a camera without this feature? I was thinking of storing the photo in RAW format may require special busses or other circuitry compared to store the data in a compressed format like .jpg.
My problem is specific to CCD and CMOS camera, I would like to understand if storing RAW format can require special hardware or is only a limitation imposed by the firmware i.e. if a change the firmware I can store acquisition in RAW format.
Clarification and a potential answer
Unfortunately, I can't post this as an answer because the question is closed but I'll report what I found that answered my question.
Some times is not a matter of firmware limitation, often in case of old cameras, the camera architecture does not allow to shoot in RAW. This is due to the location of the image buffer, which is where the data is stored before being written in the memory of the camera. If the image buffer is located after the processing unit, the camera will be able to store only already processed images and there is no way you can change this feature changing the firmware. The advantage of this solution is that a smaller image buffer is required and hence the manufacturer can lower the price of the camera.