On Fri, Aug 12, 2022 at 7:22 PM Dennis Boone <drb@...> wrote:
> > 3. You don't have pull-ups on A8 and A9, Mode 6, or COS. Pretty sure I
> > don't understand this.
> Both of those are Syntor X weirdnesses and something we missed in the
> legacy Xcat, there are pullups on A0->A7 in the Syntor X code plug but
> not on A8, A9. Maybe it's an F8 thing.
I think part of the answer to A8/A9 can be found on PDF page 11 of the
F8 data book I uploaded to the files area the other day: they're on port
1, the others are on port 4. (The rest of the answer is probably locked
up in the way the firmware sets the output buffering.)
It looks like Mode 6 has pull-ups in the radio.
And COS is an input?
Yes. When enabled the Xcat sends a CI-V packet everytime the squelch
opens or closes along with the channel. I used that to update the
title bar of the Windoze app so it would show what mode it was
listening to when scanning was enabled. It's probably not something
for a "real" CI-V bus with multiple radios, but it's handy.
> > 4. We're getting 3V3 from the RPi?
> Yes, there's a regulator on the Pico, I'm kind of assuming there's
> enough head room to be able to power our level translators (and it's
> also something I "borrowed" from the C64 project).
Pico datasheet says it can probably do 300mA. The '244 sheet seems to
indicate that a typical current is 16mA. There would seem to be plenty
of headroom.
Excellent! I hadn't looked, that make me feel better!
73's Skip WB6YMH
De
