Cerial-X

A 16550 serial port.
Here begins another project PCB.

This one has a UART 16550, a Lattice 2032 CPLD for addressing selection,
 and a header for a FTDI-232-5V USB cable.
Plus a small patch area
Two jumpers for address selection.
Several jumpers for wiring connections to the FTDI header.
LED for power, LED showing USB has power coming in.
LED showing the "FAST" cpu mode.


Update: 2020/05/08:
It's working at 406800 8N1 baud using a "KTS14,3G2" crystal and xmode bau=6.
There was a "challenge" in getting the original crystal to run at each power-up.

Addresses:
$FF60-FF67
$FF68-FF6F

and one custom: $FF28-FF2F. (this one seems broken)
With one jumper left, another two selection range could be added.

Measurements in mm. As sent in for fab.


























Here it is plugged into a buffered Y-cable while running NitrOS-9 EOU5.
Two of the yellow LED's are lit, one is USB power and the other is PCB power.
The third LED should be showing the "FAST" mode for the CPU,
 but doesn't seem to work right now.
It does work with a POKE &HFFD9,0.























IdeZilla

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