[themafia]

The Internet (mostly), the C language, the Unix Operating System were all developed and deployed on PDPs. The BASIC language /and/ an 8080 emulator was developed on a PDP in order to deploy to the Altair.

I would argue that Intel was so highly influenced by Datapoint due to sheer proximity and early inexperience in the field.

[kens]

I don't think you can count PDP-10 things (Internet, BASIC, 8080 emulator) to support the influence of the PDP-11, since they were completely different computers. The PDP-10 was a 36-bit mainframe, while the PDP-11 was a 16-bit minicomputer.

[phire]

PDP's lack of naming really confuses things, they essentially just numbered the computers by release date.

There are like 3-5 completely different family trees of computers in their numbering scheme (depending on how you count), all of them are notable in some way.

[cesaref]

Yeah, there were two busses, and the bigger ones were certainly rather impressive. I built a PDP-11/23 out of spare bits gifted from a university physics department in the late 80s, and it was awesome, but nothing like an 11/70 or anything like that!

[mrandish]

While I just missed out on minis and mainframes (starting with early 8-bit micros and 4k RAM), as a retro fan who's read deep into the Datapoint 2200, Intel, TI saga, I agree the DataPoint is a heavy hitter easily deserving of the title. But measuring 'most influential' is tricky because it depends on whether we use a hardware or software yardstick. For hardware, the Datapoint is a slam dunk for its influence on, arguably, the first 8-bit CPU (8008) and its eventual DNA impact on the CPU gene pool (x86).

For software, the PDP-11 has an ironclad claim on operating systems (Unix - which gestated on the PDP-7 but was born on the PDP-11) and languages (C), with a strong 2nd place in hardware via its heavy influence on the venerable Motorola 68000 family.

I also agree the PDP-10 should be part of this conversation as it was certainly influential. My second-hand sense from reading retro history, is the PDP-10 was beloved, if not revered, by nearly all who touched it. It was indeed an aspirational North star, but its eventual influence was both delayed and limited. Limited because it was a monstrously powerful mainframe with an equally monstrous price, selling only 1,500 units compared to the PDP-11's 600,000. This limited those who saw it to major research institutions (MIT, Stanford, etc) and large corporations. And delayed because the PDP-10's incredible power allowed some futuristic concepts to be experimentally prototyped on it first, but the advanced operating system and networking ideas pioneered on the PDP-10 would have to wait for 32-bit power to arrive on desktops in the late 80s and 90s.

Personally, I give the nod to the PDP-11 for biased (but justified) reasons. Everyone in 80s computing knew of the PDP-11, whereas I was already a retro collector before I'd ever heard of the Datapoint and its valid claims to the title (and I still can't name its operating system or any languages and applications born on it). Unfair... but is history is rarely fair. And in any dead-even tie, whatever side x86 is on must lose because, to me, it will forever bear the WinTel beige stain of being the asteroid that snuffed out a Cambrian explosion of diverse platforms, OSes and apps in the late 80s to mid-90s.

[larsbrinkhoff]

BASIC was developed on GE mainframes.