Carefully sliding cable ties under the DRAM sockets and inserting a pad of high density foam results in a firm attachment for the Drastik board.
And the end result – fully assembed and 48k!
Drastik Mounting Problem Solved
Category Archives: Drastik
Drasktik working on Model 1
Success!
The Model 1 is reporting 48k memory without a DRAM in sight. Only two solder wires required, plus adjustments to the two sets of jumper pads which I have replaced with DIP switches for ease of testing.
I’m still working on the solder-less 16k upgrade. May not be possible. Will look at this tomorrow (maybe).
Two minor issues with the board. Seems I can demux 14 bit DRAM addresses but have forgotten how NOR gates work. 
Also had to rewire the keyboard cable as the janky job performed by the previous owner died when I opened the case.
I’ve also 3D printed some replacements for the rubber-ish board standoffs that crumbled to dust when I flattened the boards. If anyone wants the files, let me know.
Drastik boards back from PCBWay
Good news! DRASTIK boards are back from PCBWay. Four working day turn around – amazing!
Bad news! My heretofore reliable Model 1 decided to go bananas once it got out of it’s case. I’ll have find that issue before I can test the board.
There’s my weekend gone.
Static RAM for TRS-80 and System-80
I’ve designed a board that allows replacement of the 8 x 4116 on the Model 1 or System 80 (aka Video Genie) with a single static RAM.
It also allows an upgrade to 48k with no extra parts. A similar board for the Model 3 and Model 4 will follow, with support for up to 128k.
I’m finishing up the board design now. The System 80 has weird spacing on the DRAMs, so I have to adjust the board to accomodate.
I’m trying very hard to get the gerbers out to PCBWay this week. Finger crossed!