I've attached the first cut of a schematic for a possible Xcat NG for
> the original X. With the appropriate firmware it will retain all of
> the features of the legacy Xcat.
Skip,
You're _way_ better at this than I am.
Questions to help me understand the magic:
1. You'd mentioned SN74LVCH8T245 bus transceiver / level shifter chips.
You did this circuit with SN74LV244APWR instead because the address
lines are always outputs, and the data always inputs, and you don't need
bidirectional translation, right?
2. You only have pull-ups on the address lines. This is because the
outputs need to be lifted, but for the inputs, the '244 chips are 5V
tolerant?
3. You don't have pull-ups on A8 and A9, Mode 6, or COS. Pretty sure I
don't understand this.
4. We're getting 3V3 from the RPi?
5. The 'LV244 doesn't seem to be available in DIP?
Thanks for all of your effort!
De
