alt Hacker NewsThe OS that was running on these is irrelevant, the important part is the BBS software.
And these usually ran quite a few lines per box, sometimes they would use external racks of modems, but I'm not seeing that here so maybe these were using internal modem cards, so maybe 6 per box, but if they were using external modems it could easily be 12 or more, with the PC cards hosting multiple serial ports, 4, 6 or even 8 per card.
Typically a card would have a single large connector at the back and then a pigtail with a DB9 or DB25 (yes, I know) for every modem.
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The OS was relevant if your BBS software was limited to a single simultaneous user, like many of the early DOS BBSes. The late 80's "PCBoard" BBSes I'm familiar with needed one PC per user, plus a file server with Netware.
Yeah, this jumped out at me too. It's a wild misunderstanding of how BBSes worked.
That said, I have no idea how a multi-node BBS would work, in terms of keeping state synchronized.
Aren’t the modems the black boxes sitting on top of each PC in the picture?
"usually" and "typically" are doing a lot of heavy lifting here :)
Access to knowledge, equipment, and budget varied dramatically prior to widespread internet access. Someone setting up a BBS might not even know about multi-line modem cards or serial port expansions. Even if they knew about them they may not have been able to reasonably obtain them. Or they may have been operating on donations, surplus, or discount equipment. Or they simply may not have had the luxury of time to research all of that as user demand meant they were too busy laying tracks in front of the train.
Many BBSes ran on 1-2 lines per PC because that's what they understood how to build or the hardware they had access to. You might be surprised at just how many lines some BBSes setup this way had!
People forget there was a time that anything outside the standard PC was extremely expensive, often had flaky or nonexistent software support, locked you into a fly-by-night vendor that might go out of business tomorrow, was only available via a distributor who wanted to have you talk to a "sales consultant" before they'd sell you something, etc. Many many people chose sub-optimal implementations because it was an off-the-shelf PC they could replace at any time with trivially simple software requiring no special CONFIG.SYS drivers or TSRs to fiddle with. Especially if you'd ever been burned previously.