sgifanatic wrote:
I don't know the reasons why, but I would guess at atleast two:
First, the term pizza box was almost a category descriptor at the time, thanks to Sun. NeXT did the unconventional cube and then moved to the pizza box design also. I think Unix workstation vendors felt they needed a "pizza box" to be in the pizza box workstation business. This form factor, prior to xU-standardized rack mounted equipment, also allowed for greater density when placed in racks.
Second, the Indigo2 implemented EISA and since this bus originated in the PC world, the most convenient way to accommodate EISA card dimensions was to go for a PC style chassis form-factor. Which is roughly what the Indigo2 was.
And yes, placing the monitor on top of the desktop case could have been a third reason. It makes logical sense.
Great point about EISA, up until 1994 my house only had pizzabox style PCs (Tandy 1000, Packard Bell 386 etc.). Never thought about the transition point in the PC world to Towers - probably helped drive the return to non-pizzabox style with the O2 and Octane with both adopting PCI card support.
It's a shame there probably isn't much documentation on the initial Indigo 2 design meetings to read other possible approaches (maybe a larger Indigo style with the slide out boards like what would return in the O2/Octane). Or maybe keeping the Indy as the pizzabox and Indigo 2 as the more unique machine since it had a premium over the Indy.
I hope one day we get a book that dives into Silicon Graphics from their inception through to the Tezro and that interviews take place before people pass away or forget some of the more interesting product development and engineering notes that most people on here would find invaluable.