SOme history that might come in handy -
pbir...@gmail.com
March 8th, 2014, 11:37 PM
The DEC PDP-11 Unibus Handbook identifies three standard ICs for use
when connecting to Unibus lines:
Bus Receiver - 8640 Quad NOR
Bus Transceiver - 8641 Quad
Bus Driver - 8861 Quad NAND
It seems to be generally a
> -Original Message-
> From: Tony Duell [mailto:ard.p850...@gmail.com]
> Sent: 28 October 2018 18:15
> To: r...@jarratt.me.uk
> Cc: General Discussion: On-Topic and Off-Topic Posts
>
> Subject: Re: DEC 8640 Pinout
>
> On Sun, Oct 28, 2018 at 6:10 PM Rob Jarr
8640 looks like a date code; most dec chip numbers begin with "DC".
On 10/28/18, 6:53 PM, "cctalk on behalf of Rob Jarratt via cctalk"
wrote:
I am trying to trace the reason why the CPU on my Pro 350 is apparently
being constantly reset. I have reached a DEC 8640 chip. Does anyone have
On Sun, Oct 28, 2018 at 6:10 PM Rob Jarratt wrote:
> Thanks for the datasheet. I have to say I am not totally convinced that I
> have correctly identified the reset pin on the F11 because there seems to be
> a lot of logic behind it. This particular path I am pursuing now seems a bit
> more pr
> -Original Message-
> From: Tony Duell [mailto:ard.p850...@gmail.com]
> Sent: 28 October 2018 18:04
> To: r...@jarratt.me.uk; Jarratt RMA ; General
> Discussion: On-Topic and Off-Topic Posts
> Subject: Re: DEC 8640 Pinout
>
> On Sun, Oct 28, 2018 at 5:53 P
> From: Rob Jarratt
> DEC 8640 chip. Does anyone have a pinout for it, perhaps even a
> datasheet,
That's almost certainly a DS8640; a quad NOR unified bus receiver. Data
sheets for the are readily available.
Noel
On Sun, Oct 28, 2018 at 5:53 PM Rob Jarratt via cctalk
wrote:
>
> I am trying to trace the reason why the CPU on my Pro 350 is apparently
> being constantly reset. I have reached a DEC 8640 chip. Does anyone have a
> pinout for it, perhaps even a datasheet, so I can understand what it is
> suppose
