I ordered parts for it to upgrade it to composite video and 16k internally. All the parts came by Friday. So I was up really late hacking it all together.
Some interesting things found inside.
Attached to the bottom of the keyboard. Appears to be some type of buzzer. It was not connected. Anyone know what program used it? The prior owner mainly had business software.
![Image](https://s2.postimg.org/rlkcwqg9x/20170804_183417.jpg)
Made up the Composite video based on the 555 and added turn based pots like on the zxvid board.
![Image](https://s2.postimg.org/sdrm9o9ut/20170804_192759.jpg)
Then after getting the rf box reattached to the board an wired up and found it was working I adjusted the pots for a nice view. I then followed up with the 16k internal expansion. It was a bit more of a pain as there was a trace on the tip of the board I missed cutting. 4 total were needed. 1 on top and 3 on the bottom. Required removing the socket I had just put in.
![Image](https://s2.postimg.org/dkcyox23p/20170805_014920.jpg)
Before the clean up.
![Image](https://s2.postimg.org/jdn0phdr9/20170805_020326.jpg)
and all up and running today.
![Image](http://s1.postimg.org/qjjs1q6fv/20170805_182808.jpg)
I did the upgrade on the video to allow me to use the zx81 with my Dell monitors but found an interesting problem. They won't sync correcty for any hires screen or PAL game. Bummer. Lucky as seen in the above image it does work my little TV.