IBM 5271 (PC3270) host interface options

Josh Dersch derschjo at
Sun Nov 25 16:34:43 CST 2007

I have the exact same card, from my 5271.  I have no idea if it's 
actually a parallel port card or not, though I suppose I could test it 
out :).

However, my 5271 originally (a long time ago, before I inherited it) had 
a card with a BNC connector on the back, which sounds like it may have 
been a host interface.  Unfortunately I didn't get the card when I 
inherited the machine (the previous user removed it to install a modem 
in its place), so I can't provide more info.  There's a chance I may be 
able to get in touch with him over the holidays, and if so I'll see if 
he still has it lying around somewhere...


r.stricklin wrote:
> On Nov 25, 2007, at 8:04 AM, Michael B. Brutman wrote:
>> I'm digging in my secret archives.  I have just one clue so far - 
>> somebody called it a 'printer/memory' card.  Based on your 
>> description of it and this clue, I doubt that it is the comm card for 
>> the machine.
> This is the same card as mine, right here. I'm not sure I buy the 
> seller's description of it as a parallel printer card, though it's 
> certainly possible. I could accept the description if somebody were to 
> find some other corroborating evidence.
> Interestingly, it was also removed from a 5271.
> Actually, the more I think about it, the more it makes sense that it's 
> a parallel card. Would the 5271 have been capable of using the Async 
> Adapter as a host interface? That's the only remaining I/O card in the 
> machine.
> ok
> bear

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