KIM Clone I/O Board

Description

For those who just wish to add on some digital I/O lines and/or add a second serial port to their KIM Clone, this board has what you need!
In keeping with my tradition of building boards I want for my own use, this is an I/O board meant to plug into either a KIM Clone or the KIM Clone Motherboard and provide lots of digital I/O pins and also a serial port.  My purpose for this was to build an add-on board that plugs into the digital lines with ZIF sockets to test TTL components using some custom software.  The serial port just seemed like one of the “heck, why not add it” ideas but has come in handy for debugging applications that normal use the main serial interface.
Features
Two WDC 6522 chips.  Each has two 8 bit parallel I/O ports, a 16 bit timer, serial shift register, etc.  A very powerful chip.  Note these are genuine Western Design Center chips from an authorized distributor, not some unknown floor-sweepings.
A 68B50 ACIA with a MAX233 driver going to a DB-9 female (DCE) connector.
Baud rate generator provides x16 clock for 1200, 2400, 4800 and 9600 baud.
Each of the three interface chips can generate interrupts; I used this a lot for some of my projects.
Keeping with another of my traditions, this can be set for 14xx, 15xx or 16xx address block.  Only uses 256 bytes in what is normally unused space in the KIM Clone memory map.
Rows of headers along the top of the board with all the parallel port lines, handshake lines, and limited power.
There are jumpers so that access to the TTL level signals of the ACIA are available.  Makes it possible to have non-RS-232 level devices connect to the serial port.
The base address of the board is 1400, 1500 or 1600.  The three chips have an offset from the base address:
00-0F = 6522 U3
10-1F = 6522 U4
20-2F = 6850
This board is for experimenters, so it is assumed the buyer knows what they are getting into.