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I remember buying software which required VGA or EGA, not supporting CGA or Hercules (or Tandy) when in graphics mode. Running MultiMate Advantage in 132-character mode was a big benefit over ordinary 80-character mode. Lotus 1-2-3 worked with expanded memory but not extended memory. IIRC Falcon could run on any PC/AT- or PS/2-compatible running at least 8MHz and 0 wait states, although it had some problems with DR-DOS.
Did some-one say 14.4 modems? The first ones I used were 300. One had been home made (not by me), and used an audio coupler. That is the hand piece of the telephone sat next to a speaker and mike in a cradle.
Coming forward a bit I used to work on Revelation. After having paid $NZ14,000 (including 40% sales tax) for an IBM XT you then had to pay for a memory upgrade from 256mb to 384mb and an 8087 math coprocessor.
A bit earlier that that there were 8080 machines running CP/M. The only diskette format that worked on different brands of computer was a 128kb single sided/single density 8" floppy. Praise be to IBM for standardisation in the PC market place.
[edited by: olwen at 6:10 pm (utc) on Dec. 13, 2004]
Hardware:
two-button, COM-port mouse
AT Keyboard
DX vs. SX
External 300-baud modems.
Keyboard locks (notice they don't have them anymore?)
Fanless-computing.
IMB 2Mbyte disks that stood 4 feet high.
Desk-top punched card readers.
Message switching.
Transistors.
Solid State.
Xedit.
WordStar
Basic.
6502 machine code.
Mind you I still have two BBC-B's, one with a second processor and Solidisk extra RAM, so I guess the last two terms are still current. :)
(If this had been 10 years ago I would have included 'wireless'...)