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Stay at Home Edition: Refraction for the Atari 2600

RetroChallenge 2018/04: Writing a proper Atari VCS / 2600 game

Refraction for the Atari 2600 (RetroChallenge 2018/04)
Accepting the processor clock challenge…

There’s a noble challenge, every programmer of self-esteem should obliege to at least once in a lifetime: programming a game for the Atari VCS, also known as “racing the beam”. In case you didn’t know, the Atari VCS (Atari 2600) has no video RAM and every line of raster image has to be composed on the fly. More so, you also have to maintain the vertical composition of the TV image, and there is no operating system, no ROM, just the bare metal machine and a trusty video/sound chip (TIA) to talk to. And there are only 128 bytes of RAM in total, already including the processor stack. To do this properly, it’s 6502 assembler once again, but this time every cycle counts.

Particularly, we do a classic two players console game with a twist. A classic game, like it was 1979, no additional hardware enhancements or fancy bank switching allowed. On the way, we learn about the Atari VCS and its hardware, and how to tackle the programming side of things. Moreover, there’s a tiny sprite editor for the VCS and even a synthesizer app to explore its somewhat unique sound generation. Also, it’s our first RetroChallenge project in color!

Start reading: “Refraction for the Atari 2600”…

Stay at Home Edition: Personal Computer Space Transactor 2001 (2017)

RetroChallenge 2017/04: Computer Space for the Commodore PET 2001

Personal Computer Space Transactor 2001 (PET 2001, RetroChallenge 2017/04)
Accepting the PETSCII challenge…

In 2017 I had a new toy and it was the 40th anniversary of the Commodore PET 2001, as well. So what may be more appropriate for RetroChallenge 2017 than to port Computer Space this time to the venerable PET? I always deemed it an interesting challenge to port an arcade game to a text only display, using nothing but the available characters. Could we do a free floating space shooter in PETSCII characters only and preserve some of the specific feel and attitude of the original game?

In the end, I (somewhat) succedded with a downloadable game for the PET 2001 (ROM 1 and ROM 2) and a special version for the C64. However, I actually deem the DEC PDP-1 to be the better gaming platform!

Have at least a look at episode 2, where we have a closer look at Computer Space and how early, CPU-less video games worked in general!

Start reading: “Personal Computer Space Transactor 2001”…

Stay at Home Edition: Ironic Computer Space Simu­lator (DEC PDP-1, 2016)

RetroChallenge 2016/10: Programming a 60 fps video game for early 1960s hardware.

Ironic Computer Space Simulator (PDP-1, RetroChallenge 2016/10)
What about a classic single player space shooter for the DEC PDP-1?

After all the software archeology on Spacewar! (see below) I was keen to try some programming for the DEC PDP-1 of my own. What about doing my own game? After all, I knew my way pretty well around the PDP-1. So I picked the PDP-1 for the second edition of RetroChallenge 2016 — and managed to write a classic video game running on early 1960s hardware at 60 frames per second!

(No April Fool’s Day Hoax!)

Admittedly, I picked a game, which I knew would fit well the constraints of this particular machine, and I was standing on the shoulders of giants who did Spacewar!, like Steve Russell, Dan Edwards and Peter Samson. More so, the game, I picked, was heavily inspired by Spacewar!, which originated on the PDP-1, so it wasn’t much of a surprise that it should fairly conform to the capabilities of that particular machine. So, closing a never existing circle by a full 360° turn and a somewhat ironic twist in computer history, I ported the very first coin operated video game back to the computer, which inspired it in the first place. Ironically also, because “Computer Space”, despite its cheerful name, doesn’t feature a computer at all, but is rather a complex pattern generator in 74xx-series TTL logic, which we now had to simulate on hardware, which predated its TTL electronics by a decade. And, as a bonus, there’s now a classic single player shooter for the DEC PDP-1. (Eventually, the program ran on the real machine at the CHM.)

Start reading: “Ironic Computer Space Simulator (ICSS)”…

Stay at Home Edition: Maze War for Olivetti M10 and NEC PC-8201A (2016)

Implementing a 3D dungeon crawler in MS BASIC for RetroChallenge 2016/01.

Maze War for Olivetti M10 and NEC PC-8201A
It was to be a networked first person shooter, but it became a 3D dungeon crawler, after all.

In 1983 Kyocera introduced a remarkable portable computing platform, which was marketed by various vendors as by Tandy as the TRS-80 Model 100, by NEC as the PC-8201 and PC-8201A, by Olivetti as the M10, and by Kyocera itself as the Kyotronic 85. These machines, which I like to refer to as the “Kyocera siblings”, were about the same, but not exactly, differing both in hardware specs and in their respective implementation of MS BASIC (the last one, Bill Gates was actually coding for). Quite a success with in-the-field workers like journalists and with about 6 millions units sold for the TRS Model 100 alone, these were about as numerous as nowadays the stockpile of toilet rolls for a family of four. Therefore, these were rather easy to obtain as a retro machine and I got me two of them, namely a an Olivetti M10 and a NEC PC-8201A.

RetroChallenge is a loose, not too serious gathering/competion twice a year, where folks do things with retro computers or consoles over a month and report about this in order to let others participate in their efforts. Eager to play around with the new toys, the choice for my first participation in RetroChallenge was an easy one. And it was also the first time, I got to mess around with BASIC after a pause of about 30 years. While originally intended as a full-fledged, networked implementation of the historical first person shooter, BASIC and the time constraints got me only that far. Eventually, it became a first person dungeon crawler with a pseudo-3D view port and a static map, running — while not exactly in realtime — at reasonable speeds. (This involved both high and low level approches, like JIT compiling display data to byte code for a small runtime to send low level display data over the internal serial port to the LCD controllers, which also overcame differences in the various dialects of MS BASIC found in these machines.)

Have at least a look at episode 1, where we have a closer look at the various incarnations of the Kyocera siblings.

Start reading: “Maze War for Olivetti M10 and NEC PC-8201A”…