8919Re: [midatlanticretro] Re: what network for the PC jr?
- Aug 2, 2008What do you mean by "successful"? I saw IBM PC Network used in two
different business for which I worked in the late 80s and early 90s;
both used it primarily for printer sharing. These were primarily 8088
and 286-based computers. Admittedly, the overhead of the network
limited what applications could be run successfully on the computers,
especially in the small law office where I worked that was too cheap :-)
to have a standalone computer for the print server. So the secretary who
was stuck with the print server computer (always the one lowest on the
totem pole) had a tough life....
Given the limited demands on these environments, though, the IBM product
did a credible job and allowed the sharing of what were very expensive
laser printers among multiple workers. -- Ian
On Sat, 2008-08-02 at 08:21 -0700, Jim Scheef wrote:
> This is not Token Ring. Token Ring was announced during the time or
> the Cluster but TR would not ship for 2 years or more. As you surmise,
> it's not Arcnet either. Nor is it Ethernet (with capital E). The IBM
> Cluster Program (its proper name - IBM did not call it a LAN) uses
> baseband signaling similar to Ethernet. The specs say it runs at 375K
> bps over 75Ohm coax like for cable TV but with BNC connectors like
> Ethernet. I'm hoping I can get short distances to work using regular
> 50Ohn cheapernet. Like the PCjr, the Cluster was intentionally hobbled
> to keep it out of businesses and in the classroom.
> At the same time IBM sold the IBM PC Network which they did refer to
> as a LAN. It used broadband signaling over 75Ohn coax. This network
> was much more complex but was the network where NetBIOS first saw
> This was the era when LANs were new and there were no standards. True
> Ethernet was XNet as defined by Xerox, Intel and Digital Equipment.
> The December, 1984, issue of BYTE Magazine has an excellent review of
> 24 different local area networks for the IBM PC. None of these would
> interoperate and only Novell offered versions of its software to
> operate over other vendor's hardware. I suspect this is what made them
> successful. As a side note, the early Novell server used a Motorola
> 68000 CPU.
> Local area networks were not really successful until the Intel 386
> gave PCs more power and a flat memory model for the server operating
> ----- Original Message ----
> From: Jeff Jonas <jeffj@...>
> To: Jim Scheef <jscheef@...>
> Sent: Saturday, August 2, 2008 9:01:17 AM
> Subject: what network for the PC jr?
> I see your VCF entry is
> IBM Cluster Network
> Jim Scheef (New Milford, CT, United States)
> Play games on a diskless PCjr loading the games over the network
> from an XT server. The Cluster was IBM's solution
> for the computer classroom of the future.
> What network is that: token ring?
> I can't believe IBM would have used ethernet on the XT
> or Arcnet (not invented here!)
> -- jeff jonas
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