“We just called it “chiptune” then. I think. I mean, we really didn’t have anything else to call it”. That’s what Minusbaby says about the early days of the chipscene in USA. Nice to read some thoughts about this. My own memories are a bit blurry. But it was certainly unchartered territory back then, perhaps even more so in USA then Europe. Chiptune was the most popular term in the 00’s. I suppose 8bitpeoples contributed to that, like most others. The old VORC was perhaps even more important. Now, the chipmusic term seems to be getting more <3 again, judging from biographies, forums (chipmusic.org), etc.
In the 1980s some people talked about micromusic as music made with microcomputers (8-bit home computers with PSG soundchips, mostly). When the Amiga came out, it could play things that didn’t sound like micromusic. Therefore the terms chiptune and chipmusic appeared. But what did these terms mean 20 years ago?
I’ve previously argued that in 1990 chipmusic was equal to chipmodules but that was probably wrong, actually. I’ve discussed it with several of ye old legends, and there are different opinions. Except for chipmodules, around 1990 chipmusic could also refer to synthetical Amiga music or PSG-music.
What can the archives tell us? According to a search at Bitfellas there seems to have been chipmodules as early as 1988, in Compackting Disk Intro by The Supply Team (a Danish pioneer group also on the C64). I was too lazy to setup UAE and check it out though, so I’m not sure. :) UPDATE: mod.introsound was made by Rambones (still active), and uses a short non-looped sample.
In 1989 the word ‘chip’ starts to appear here and there without any apparent chipmusic-reason. More importantly, 4-mat makes chipmodules and releases them in a lost production and in an intro without music :) . TSM released something like a chipmodule in Invasion, called weinigkb – few kilobytes .
He told me that he heard the chiptune-term only years later, and it meant Soundtracker-based songs with short C64-samples. (I mistook TSM for Suntronic)
Surely enough, 1990 saw the release of atleast two chipmodule music disks with C64-covers: Sludger’s Music Demo and Captured Imagination by 4-mat. He also released chip-things like Mole’s Hot Demo Pack, Skywise’s Intro, Music Demo (called Chip Music Demo at Bitfellas?) and Inspired Sounds. Chip Music Festival by Magnetic Fields is the earliest use of the term that I’ve found, and there are no chipmodules in it. It’s all synthetical songs made by Jochen Hippel, Ziphoid & Uncle Tom, Walkman, etc. Chipmodules is a new method and there’s no established term. Look for example at the text in Blazer’s Riots or Savage’s Short.
It seems like chipmusic appeared before chiptune. Chiptune was a noun, meaning a piece of chipmusic. (That always annoyed me with
chipmusic chiptune later. Could it originate from a linguistic glitch between English and Japanese?). Anyway, by 1991 the chiptune term was well established. Nuke/Anarchy made a song called chiptune-12k, 4-mat’s song L.F.F also appears as mod.chiptune, and there’s this. The musicdisk Synthetic Vibes includes some of the most famous chip-names at the time (except the already mentioned also Mantronix, Heatbeat, Emax). 
(Btw, if there was a competing term, it could’ve been intro-music. There are many songs called that, for example by Heatbeat, Dr. Awesome, 4-mat, etc. But I guess the C64-inspiration made the chip-terms seem more fitting?)
Unfortunately music archives don’t really date its entries, so it’s hard to do a similar research. But on the other hand, you can search for text inside the songs. That way, we can find songs like megademo-vectorbobs where 4-mat claims to have invented chipmodules and asks all sample-rippers to piss off. When I interviewed him for my thesis he was not very proud of this, and admitted to being a sample-ripper too :)
This little excursion tells us that the chipmusic-term was used in 1990, and that chipmodules might’ve been around in 1988. Also, the use of the chip-term seems to have a UK-origin (Anarchy, Magnetic Fields, etc). But hopefully someone can take this research further. Would be interesting to see more heavy data analysis of these archives, to find out more about how chip-terms were used in demos and songs. (And who stole whose samples, for example. Remix culture 30 years ahead of its time!)
But one thing that strikes me, is that the synthetical Amiga tunes around 1990 have aged quite well. If you listen to this MP3-playlist of Amiga tunes from 1989, it feels very modern compared to other electronic music from that time (for a chip-literate, anyway). First of all, it’s not really songs – it’s loops. The linear song-format, on which most music consumption is based, is not really applicable here (great!). Secondly, the minimalist sound capabilities make it less dated. Elsewhere there were orgies in cut-up sampling, drum machines, consumerized sequencers and FM-synths. But the assembler-based 8-bit micro synthesis led to … something else. And last but not least – the music was embedded in a cracker culture that we – the consumers – were mesmerized by. Who were they? How did they make the music? How can I do it? No recording artist could get the same kind of mysterious distribution.
Some people would say it’s “only nostalgia”. Maybe it is, whatever people mean by that expression. But at the same time, this is so different from most contemporary chipmusic. In fact, it doesn’t share much with it at all. During the pinnacle of chip-purism a few years ago it would not even qualify as chipmusic. But today it feels like its pointing towards a possible future for chipmusic. The chipscene is described mostly in dusty postmodern technoid terms á la remix culture (like appropriation). But that’s going to change in the 2010s. You read it here first!
 4-mat’s first chipmodules were Autumn, Knighthawk and Space Journey according to himself. They were based on ST-01 samples.
 Check TSM’s page about his 1989-activities, including the source code to a 1988 text editor softsynth for Amiga. Some great crackmospherical space ambient electro in there.