What is a BC01-R

[Chris Zach]

Oh ok, you answered it. It's from an 11/20. Weird since I never had one, 
Alan Frisbee, didn't you have an 11/20 next to your CR11 reader when I 
was over at your place 30 years ago?

Still the question: Anyone need it and willing to trade it for an 8/L 
serial cable and card?

On 1/2/2022 11:35 AM, Nigel Johnson Ham via cctalk wrote:
> The original serial interface in the PDP-11 (later 11/20) was four cards 
> in a specially-wired backplane slot.  There was an M782(1?) interrupt 
> controller, a data path module whose number I forget, and the interface. 
> That card brought out the cable to the outside world. IOW they were 
> combining existing modules to get the serial function, and adding the 
> interface card to connect to the outside world.
> 
> The later DL11 of course did it all on one module which fitted into an 
> SPC slot and had a 40-pin Berg connector on the side facing the Unibus 
> slots for the cable take-off.
> 
> It's been along time since I took the factory training course on the 
> PDP11/20, and I believe the ones I worked on in the lab at Maynard that 
> already had a DL11 in them.
> 
> cheers,
> 
> Nigel
> 
> 
> Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
> Amateur Radio, the origin of the open-source concept!
> Skype:  TILBURY2591nw.johnson at ieee.org
> 
> 
> 
> On 2022-01-02 11:24, Chris Zach via cctalk wrote:
>> Hm. Ok, so what was it for then? Any specific pdp11, or just the 
>> serial plug for a weird Unibus sync modem cardset?
>>
>> I'm thinking of cutting it down and using it as a 20ma current loop 
>> plug for one of my pdp8/L's. If anyone wants to trade it for a real 
>> DEC 8/I or 8/L card or if this thing has some sort of value let me know.
>>
>> C
>>
>>
>> On 1/1/2022 8:55 PM, Bill Degnan via cctalk wrote:
>>> On Sat, Jan 1, 2022, 7:03 PM Nigel Johnson Ham via cctalk <
>>> cctalk at classiccmp.org> wrote:
>>>
>>>> Found here:
>>>>
>>>> http://www.pdp8online.com/bklatt/43.jpg
>>>
>>>
>>> https://www.vintagecomputer.net/browse_thread.cfm?id=249
>>>
>>> Bill
>>>
>>>>
>>>>