I found an interesting 6502 video (not obvious from the title) that others may find interesting.
The video details the cracking of a pay-tv box, leading to the discovery of a WDC 65c02 (just called 6502 throughout the video) at the core of the access control chip.

Link:
https://www.youtube.com/watch?v=lO4TNnkN64A

Notable parts in the video:

Decapsulation and delayering to read the ROM
https://youtu.be/lO4TNnkN64A?t=1082

Identifying the CPU architecture and discovering its a 6502.
https://youtu.be/lO4TNnkN64A?t=1526

Glitching the chip and getting user code to run in ram.
https://youtu.be/lO4TNnkN64A?t=2112

Brilliant! Some stills, and a link to the slides, at
http://hackaday.com/2016/12/27/33c3-chr ... ks-pay-tv/

Thanks for tracking down / posting the additional links, double brilliant!

Some points which might be worth making:
- this is the sort of licensed 65c02 which we'd not normally know about, which is the bulk of WDC's business
- the 65c02 inside is not a structured design, it's a synthesised design perhaps from HDL (or perhaps delivered as a logical netlist)
- this Access Control Processor does lots of realtime DES decryption, but using hardware acceleration
- the 6502 is running a multitasking application
- care has been taken to keep secret data only in RAM, to generate the clock on-chip, to place reset-trapping addresses within the key data areas of RAM, to have no means to modify the code that's running
- the chip was, ultimately, found to be vulnerable to glitching the power supply very precisely
- the chip is from 1998 and only now, after 18 years and with a great deal of effort, is the protection broken

Edit: capturing program flow by glitching the power supply is covered from about the 39min mark.

I was just about to share this video with a friend when I clicked the link and... it's gone. Gah!

_________________
8 bit fun and games: https://www.aslak.net/

The official video is still up, at
https://media.ccc.de/v/33c3-8127-how_do ... ble_pay_tv
and on YouTube at
https://www.youtube.com/watch?v=lhbSD1Jba0Q

Thanks BigEd.