[Coco] coco 1 info needed 26-3001

[Darren A]

On Sat, Apr 4, 2015 at 3:12 AM, Joe Grubbs  wrote:

> The adapter I made for mine has no extra wire or that resistor network.
> It's just a ribbon cable with an FFC female on one end and an FPC female on
> the other
>
>
> --- Original Message ---
>
> From: "Josh Harper via Coco" <coco at maltedmedia.com>
>   hi guys
> I have a coco 1 26-3001
> does anyone know what the  pin sticking  at location on  tp12 on the board
> is for
> this location had a wire soldered to it leading to a factory installed
> keyboard adapter  that allows u to use coco 2  type keyboards
>


TP12 on the CoCo 1 is the +5V supply. It is providing power to the resistor
network. Having pull-up resistors on the keyboard row pins allows you to
replace the 6821 PIA with the 6822 IIA used in later motherboards (CoCo 1 F
board and beyond).

- Darren