Your first computer specs (you owned not used)
386 processor 16 megahertz with 4 megabytes of ram and 40 megabyte hard drive.
= new reply since forum marked as read
BM Personal Computer (PC)
Model: 5150
Released: September 1981
Price: US $1,565 ~ $3,000
CPU: Intel 8088, 4.77MHz
RAM: 16K, 640K max
Display: 80 X 24 text
Storage: dual 160KB 5.25-inch disk drives
Ports: cassette & keyboard only
5 internal expansion slots
OS: PC-DOS v1.0
SO awesome! LOL
had a 16-bit TMS9900 CPU running at 3.0 MHz. 32k of ram, both cassette and single sided floppy in a PE box. Speech synthesizer. 300baud acoustical modem for dial up. Only displayed 40 columns so on 80 column boards had to use a keystroke to toggle over 20 characters to the right two times. Third brought you back to the original 40.
Still have it, though now when I want to play Tunnels of Doom I use an emulator. 
...eventually it had 1K of memory.
http://en.wikipedia.org/wiki/RCA_1802.
It had an 1862 video chip too, with a max resolution of 64 X 128 pixels, black or white.
I was working on a cassette interface that was almost working reliably when the Sinclair ZX81 kit was offered in Byte magazine.
(Maybe the first computer I ever built was a simple relay machine, but it didn't do much, so I'm not counting it. Mostly it could count or add numbers, from zero to twenty. It had two Nixie tubes for display.)
The first computer I used for writing school papers and such was an Atari 800. I still think those are awesome machines. I've kept a few of my old Ataris, but I also have them (and all my past computers) emulated on my Linux desktop, along with most of my old files.
Here's my Windows 3.1 machine:
Calimara was a shell that made Windows 3.1 look a little like Windows 95, which I couldn't afford at the time.
This was on a machine with similar specs as your first machine. But mostly I was booting up with DR DOS and using the command line or Geoworks.
Geoworks played nicely with DR DOS, you could click on a DOS program and Geoworks would neatly step aside and then return again as soon as you exited the DOS program. MS DOS wouldn't do that.
I love this stuff. Microsoft and the IBM PC architecture almost sucked all the fun out of computing, but Linux and other Open Source software, and devices like the Raspberry Pi have brought it back.
Commodore 64
CPU MOS Technology 6510 @ 0.985 MHz (PAL version)
Memory 64 kB RAM + 20 kB ROM
Graphics VIC-II (320 × 200, 16 colors, sprites, raster interrupt)
Sound SID 6581 (3× osc, 4× wave, filter, ADSR, ring)
To this day I'm amazed by the music they were able to create on the C64.
