then write up the marketing letter, format it and let it all rip on a Diablo 630 daisy wheel printer. Many, was that thing loud. Made the whole office grimace when I kicked it off. //

Re: Loud printers
You've obviously never used an ICL 1900 lineprinter: these could print at 160 characters per line at up to 1300 lines per minute. The mechanism was based round a hollow drum the full width of the paper with 160 rings of characters, each containing the complete character set. These were organised so that each embossed row had the same character in every position. The embossed drum was installed behind a row of 160 hammers and a inky ribbon the full width of the paper: both paper and ribbon scrolled vertically, though not at the same speed. The print hammers were driven off a very latge capacitor in the printer's body.

The printer was loud enough when printing invoices, etc, but George 3's print driver could easily outdo it. It separated documents by outputting, IIRC, a page throw, a job title, 10 full width lines of 160 asterisks and another page throw: when this happened the printer almost jumped off the floor and made a noise similar to a short burst from a machine gun.

These ICL printers were much louder than any IBM lineprinter I've ever heard running. That's because IBM used train printers: the character set formed a rotating chain running across the paper path and were designed so that only one character could hit the paper at a time. //

Re: Loud printers
Impact printers were getting fairly close to their practical limits in terms of printing speed. There was a flurry of development in the early 1970s to come up with better solutions. Xerox produced something that was kind of a hybrid between a drum printer and a photocopier - a set of flash lamps illuminated the correct characters on a drum transferring their images optically to the selenium copier drum. That got printing up to around 4000 lines a minute. Honeywell introduced an electrostatic system using a dielectric paper that raised speeds to 18,000 lines per minute.

However, it was IBM that developed the first laser printer - the IBM 3800. Its initial version managed only a shade under 14,000 lines per minute, but a later version raised the speed to over 20,000 lines per minute - around 2.8 km/h. With paper running that fast , a laser and a hot fuser unit, suddenly noise was not the only hazard. There's a fascinating training video for operators that shows the massive scale of the beast.