Re: New small sized MOS8701 replacement

On 7/11/2020 2:45 PM, Jeffrey Birt wrote:
> Hi Frank,
>
> Yes, I used an SOT23 single gate inverter and a pull up resistor. It took up a bit more space than the two cut pads so I had to slide the IC up a little. I'm sending one to a friend in the USA who has a PAL converted C64 so he can double check it works. It should and I can set up a test rig on a breadboard but it would be nice to know for certain in a  real machine.
>
> Jeff
>
> -----Original Message-----
> From: Francesco Messineo <francesco.messineo_at_gmail.com>
> Sent: Saturday, July 11, 2020 1:44 PM
> To: cbm-hackers_at_musoftware.de
> Subject: Re: New small sized MOS8701 replacement
>
> Hi Jeff!
>
> I bet you had to add some small logic gate to make this happen. I thought about automatic config too, but I've never found a good method that didn't need more logic chips.
>
> Frank
>
>
>
>
>
Not that sot23 inverter is not a good solution, but I would think a 
transistor and resistor would also implement a NOT gate needed.  It's 
not like the signal will be switched a low, so a weak high via pullup 
and a pull to ground via PNP should do the trick, no?

Jim


-- 
Jim Brain
brain_at_jbrain.com
www.jbrain.com