A 2-post collection

Pi Zero Terminal & The Missing Module

By apam |  Aug 20, 2019  | cp/m, rc2014, retro-computer, sc114, z80

Today I built 2 modules, The Pi Zero Terminal module, which allows me to use the RC2014 without a computer (well it uses a Raspberry Pi Zero, so still uses a computer I suppose).

It worked, but the mini OS on the SD-Card (for the zero) was compiled for use with a UK keyboard. Luckily the source is available online, so I could compile it with US keyboard support.

Pi Zero Terminal

I noticed I had a spare 40-pin header left over from the Pi Zero kit, and the missing module was missing headers (still waiting on them) so I decided to break it up and build this module.

It worked first go which I was pleased about. By worked, I mean booted CP/M just fine, however the RX and TX LEDs (The yellow and red LEDs) don’t seem to light up. Not sure if I have wired them incorrectly or if I’m not transmitting / receiving enough in my tests to get them to light up long enough to see.

The Missing Module

So what’s next? Well, I still haven’t gotten to my goal of connecting to a BBS with my Z80 computer, that’s going to require two serial ports, and some kind of wifi modem. So the next project will be to build a SIO/2 dual serial port module, a baseboard that can fit it and a new Z80 CPU module.

I have a few baseboards I bought on eBay, and am getting the CPU / RAM / ROM module and SIO/2 module printed. It’s mostly waiting for the parts to arrive now, and some I am yet to order.

SC114 Built

By apam |  Aug 16, 2019  | sc114, retro-computer, z80

SC114 Built

Today I built Stephen Cousins’ SC114 I had been waiting for the headers to arrive from China, but found I had some extra 40pin female headers from my RC2014 kit, and had a 6 pin male header from an Arduino.

It didn’t work when I plugged it in, but after scratching my head for a while I found a bad solder joint, so I fixed it and now it works. 🙂

I plan to use this with Karl Brokstad’s “61c The Missing Module” but I need to wait for the extra headers to arrive to build that.