IBM PC Network

Richard Pope mechanic_2 at
Mon May 24 13:50:53 CDT 2021

Hello all,
     IBM also stated that personal computers will never be accepted. 
Then when they finally bowed to pressure and started building personal 
computers they stated that color and sound would never be necessary,
GOD Bless and Thanks,

On 5/23/2021 2:06 PM, Lyle Bickley via cctalk wrote:
> On Sat, 22 May 2021 23:00:31 -0600
> Grant Taylor via cctalk <cctalk at> wrote:
> Here's IBM's "Redbook" on Token Ring: "IBM does not view high-speed 
> Token Ring as a requirement for the majority of its customers, and 
> therefore the decision has been made not to provide 100 Mbps 
> high-speed Token Ring uplinks on its products..." Also: "Note: IBM 
> Statement of Direction, effective October 2001: For z900 server, this 
> feature is called the OSA-2 Token Ring feature, and can only be 
> configured as two 4/16 Mbps Token Ring ports. Note: Effective October 
> 2001: OSA-2 Token Ring feature (feature code 5201) is superseded by 
> the OSA-Express Fast Ethernet feature (feature code 2366), and 
> OSA-Express Token Ring feature (feature code 2367), as required. OSA-2 
> Token Ring feature (feature code 5201) is not carried forward on G5/G6 
> server to z900 server upgrades." To download the Redbook: 
> Interestingly, 
> in spite of their statement of direction, for a time, IBM did make a 
> "High-Speed 100/16/4 Token- Ring PCI Management Adapter" (Token Ring 
> PDF attached...). It was NOT popular - and not many were sold. 
> Ethernet had "won" the hearts and minds of IT folks (plus Ethernet by 
> that time was full duplex - at both 100Mbps and 1000Mbps, potentially 
> doubling it's capabilities). Ethernet also could be implemented for a 
> fraction of the price of Token Ring. When IBM began to support 
> Ethernet on mainframes, Token Ring "died" ;) As a networking company 
> we never installed any 100Mbps Token Ring networks - and weren't aware 
> of any implemented by our competitors. Cheers, Lyle 

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