1802 MemberChip kit build

Introduction

Page last updated Nov 6 2023. I built a Lee Hart 1802 MemberChip board in Nov 2020. Here's some of the build details in photos and brief descriptions. I've made a number of mods not in the kit. Also there's some errors I undid. Current information on the 1802 MemberChip card can be found at Lee Hart's MemberChip sales page. It's also featured in the 2023 Hackaday contest currently at this Web page. - Herb Johnson

parts as provided by Lee Hart's kit.
printed silkscreens on both sides of paper
I pasted two photocopies (one mirrored) on one piece of paper, to assist me in construction. CPU side of circuit board
ROM side of circuit board, some components installed
I added a 3-pin socket for ceramic resonator, to change speeds.

install socket pins from strip, even for TTL

I used a 40-pin socket to align the header and CPU socket
I used a 20 pin header with long pins, for the 20 pins of the 1802 which provide data and I/O signals.
That becomes the I/O expansion for the board. The other 20 pins are a short 20 pin SIP socket.
installed CPU socket RAM already installed

I had to pull the 74HC573, installed backwards
Photo checks holes (vias) for damage

had to remove a PC trace this board had a flaw

installing the ROM socket
another view of the ROM socket

view of the 20-pin header and the 6-pin power/serial header
See how I used red & black wire insulation to mark +5 and ground

completed board on CPU side
completed board on ROM side

The USB/TTL dongle
USB/TTL dongle wired to MemberChip
Windows PC display (terminal program) of MemberChip ROM in operation

MemberChip with Motorola 6820 PIO on application board
The board was built on a plain protoboard with a female socket to match the 20 pin header.
It was hand wired and soldered, no copper needed.