Here is a photo of the prototype slot expander 1 board. It is compatible with both the replica 1 and apple 1 boards.
I have more tests to run but it is working great. As long as all the tests work out production run will start in November. Estimated price is $59 assembled or kits for $49.
Maybe add a card edge connector to the left hand side so you can have more boards?
Yeah but that would increase the price to have those added by about $15 for gold fingered edge. Besides, 3 should be plenty. Oh man, didn't Bill Gates eat words saying something like that.
Why would it make the price go up?
you can calculate it at http://www.pcbcart.com/cart.php
As far as i know it adds just USD 2,- for a print.
I get all of my PCBs done at pcbcart.
Today ordered and in 2 weeks the babies are here
It's not the fingers, but getting them in gold for a slot connection. The apple 1 side is soldered directly so they don't have to be gold but to daisy-chain multiple boards you would want gold contacts for the fingered edge of the board. This adds about $10 a board depending on how many you get.
The Apple-1 would be fine with tinned fingers. My whole altair still works 30 years later and it has plenty of tinned fingers. : )