Notes about 8-bit

November 13, 2021 permalink

Open to Conversion

Screen shot from PCPaint in 4-color mode

Over on Tedium, a nostalgia bomb roundup of 10 image file formats that time forgot. I wouldn’t say that BMP or even TIFF are exactly forgotten, and VRML seems like the odd one out as a text-based markup language (but definitely in the zeitgeist this month with all of the nouveau metaverse talk), but many of these took me back to the good old days. Also I didn’t know that the Truevision TARGA hardware, remarkable for its time in the mid-1980s with millions of colors and alpha channel support, was an internal creation from AT&T (my dad worked for AT&T corporate back then, but all we got at home was the decidedly not-remarkable 2-color Hercules display on our AT&T 6300 PC). JPEG and GIF continue to dominate 30+ years later, but it’s interesting to see what could have been, if only some of these other systems jumped more heavily into file compression…

June 16, 2011 permalink

Maniac Mansion Disassembled

The Mansion – Technical Aspects

If you love the old Lucasfilm games and want a peek into how their venerable game engine worked from a very technical perspective, you should read this article that walks through a disassembled Maniac Mansion. Extra bonus: Ron Gilbert, the creator of the SCUMM scripting language, drops a lengthy note in the comments section with insider info:

One of the goals I had for the SCUMM system was that non-programers could use it. I wanted SCUMM scripts to look more like movies scripts, so the language got a little too wordy. This goal was never really reached, you always needed to be a programmer. 🙁

Some examples:

actor sandy walk-to 67,8

This is the command that walked an actor to a spot.

actor sandy face-right
actor sandy do-animation reach
walk-actor razor to-object microwave-oven
start-script watch-edna
stop-script watch-edna
say-line dave “Don’t be a tuna head.”
say-line selected-kid “I don’t want to use that right now.”

I think it’s amazing that they managed to build a script interpreter with preemptive multitasking (game events could happen simultaneously, allowing for multiple ‘actors’ to occupy the same room, the clock in the hallway to function correctly, etc.), clever sprite and scrolling screen management, and fairly non-linear set of puzzles into software originally written for the 8-bit C64 and Apple II era of computers.

(Via the International House of Mojo)