About

My name is Seth Morabito, and Loom Communications is my personal and professional home page.

I've been active online in one way or another since 1992, and working in the high tech industry since 1995. I'm a software engineer, hacker, tinkerer, maker, and perpetual learner.

Projects

These are some of the things I’ve been working on for fun in my spare time.

Retrochallenge Summer 2013

As always, the purpose of Retrochallenge is to play around with vintage computer technology in some way. This year, I chose to build a VT100 keyboard to USB keyboard converter, so I could use a real VT100 keyboard on my Mac. The firmware was written in AVR C, and I learned a lot about the inner workings of a vintage serial terminal.

I'm very honored that my project was chosen as the winner for Retrochallenge 2013. More details than you could ever possibly want are on my weblog.

IttyChat

IttyChat is a light-weight internet chat room built on Node.js and CoffeeScript. When I say “chat room”, I mean it in the very retro sense of a Telnet-based chat room. None of this fancy web business, no sir!

To use IttyChat, you need to start the server, then telnet in and create a character. Characters are saved in a SQLite3 database between sessions. There’s a lot more I'd like to do with this, but with so much going on, it's been a low priority.

Home Brew Computers

I built a simple 6502-based personal computer from the ground up, using a handful of ICs. It's not a complex design, but it offers simple terminal-based IO and cassette storage. It's built around a Rockwell R65C02, a 6522 VIA, a 6551 ACIA, 32KB of EPROM, and 32KB of SRAM.

Next plans include a Z80-based system, but it's still in the breadboard stages.

Retrochallenge Winter Warmup 2013

This was a fun project. My home-brewed 6502 computer had no capability for mass storage, so I had no way to save programs. For 2013's Winter Warmup, I chose to build a cassette storage interface so I could re-live the awful old days of PRESS PLAY ON TAPE.

I documented the whole process on my weblog.

Symon 6502 Simulator

Symon is a 6502 system simulator, written in Java. At its core is a 6502 CPU emulator, but the simulated system also includes RAM, ROM, and a simulated 6551 ACIA. It has a virtual serial terminal connected for I/O. Programs and ROM images can be loaded and executed. There's a simple suite of debugging tools, as well.

Symon is fairly rigorously tested, and should be extremely accurate. At this time there are no known core 6502 emulator bugs, so it can serve as a platform for 6502 software development and testing.

PDP-11/35 Restoration

I've had an unhealthy love for the PDP-11 since college, when I first laid hands on one that was destined for the scrappers. Some friends and I nursed it back to life and played with it over the course of a couple of semesters.

When I was offered a complete PDP-11/35 last year, I jumped at the chance. Unfortunately, the machine had been left in a barn for over a decade and became infested with mice. It was severely damaged, but I spent a few months carefully restoring it.