Documentation for F11 Chipset?

[Bjoren Davis]

I recently brought a PC350 back from the dead.

A good source of documentation for the F-11 is that for the 11/23 and 
11/24 (e.g., 
http://bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Processor_Handbook_1979_80.pdf 
chapter 3 "LSI-11/23 Processor" or 
http://bitsavers.org/pdf/dec/pdp11/1124/EK-11024-TM-001_PDP11_24_System_Technical_Manual_Jun81.pdf)

The first thing I'd do is to attach a "console terminal" cable (a cable 
attached to the printer port with pin 9 pulled to ground -- pin 8).  DEC 
makes such a cable called BCC08 but I just made one myself.

Then use a terminal program at 4800 to send a break and see if you get 
the ODT prompt.

In my case I didn't get such a response.  It turned out that the leaky 
battery had destroyed the "EPCI" at E155 (the async serial chip for the 
printer/console terminal port).  I swapped the EPCI at E154 (the 
keyboard async serial chip) and I was able to at least talk to the ODT.  
I then bought a replacement EPCI on eBay and I was on my way.

Good luck!

--Bjoren


On 5/3/2021 12:16 PM, Zane Healy via cctalk wrote:
> On May 3, 2021, at 3:19 AM, Rob Jarratt via cctalk <cctalk at classiccmp.org> wrote:
>> I have gone back to trying to fix my DEC Professional 350. I have a printset
>> for the machine now. I think the CPU is being constantly reset.
>>
>> Is there any documentation anywhere on the F11 chipset? Bitsavers only seems
>> to have the later J11.
> Is the Sunsite archive still online?  I seem to recall there being some documentation there.
>
> Zane
>
>
>