[rescue] Wanted - 3B2

Sandwich Maker adh at an.bradford.ma.us
Tue Jul 8 08:08:40 CDT 2008

" From: wa2egp at att.net
" -------------- Original message ----------------------
" From: adh at an.bradford.ma.us (Sandwich Maker)
" >
" > " From: wa2egp at att.net
" > " 
" > " Somebody mentioned the 3B1
" > " but it was similar to the 7300 (I do not know what the difference
" > " was).  I modded mine so it can take larger hard drives.
" > 
" > the 3b1 case had a bump to accept full-height 5.25" drives; the 7300's
" > smooth top only allowed half-height drives.  the 3b1 ps was slightly
" > more powerful too.  otherwise there was no difference.
" I remember now.  Probably the beefier power supply was for the power
" those full height drives would pull.


" Actually, I was toying with the
" idea of putting in two 3.5 drives in place of the 5.25 drive.  I would
" fit if I swung the drives sideways.

i did that, along with the unofficial 2-drive hack.  used a pair of
80M seagates.  fit pretty well.  alas, the system board died shortly
after that, for reasons i'm pretty sure were unconnected.

i still have that dead system in my basement iirc.

" Too bad they didn't go one more
" version of that machine.  The next one would have been color.

i remember that!  but even if they hadn't, it would've been easy to
revise the old b&w to include greyscale.

they were also supposedly -this-close- to releasing sVr3 for the 3b1
when it was canned, with a substantial performance improvement.  the
3b1 os from convergent was actually berkeley based though svid

since i had the hardware manual [with full schematics], around '95 i
toyed with generating and releasing equation files to program
off-the-shelf 40-pin fpgas with all of the system board random logic
so that 3b1 clones could easily be made but i never got around to it.
i also wanted to do a qic-40 floppy tape driver.  i still don't know
enough about driver programming today.

the one schematic the manual lacks is the video chip.
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh at an.bradford.ma.us                       and think what none thought

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