On Sat, 2 Apr 2022 at 00:34, Bill Gunshannon via cctalk
wrote:
>
> And, as you say, an Arduino or a Pi that fits in my pocket is orders
> of magnitude more powerful and costs pocket money.
The comparisons of size, power, storage, cost, power usage, heat
output and so on are often made.
What is l
> does [disabling the MCLK counter via DCLO, asserted by the two
> E126 monostable chain from ACLO] happen just on power-down, or on
> power-up too? I'd need to understand how that two monostable chain
> works in both cases, which I currently don't. (I only understand
> monostab
>
> Disconnect the bad ACLO, power it on, and see if the CLK LED comes on. if
> not, then we'll have to work out why not.
This is my plan for later today.
>
> Noel
> and there is some circuitry driving the clear input on the second
> 123.
Never mind this section. I mis-read the print; the clear input is connected to
an _input_ of the flop below (which is also tied high).
Noel
> -Original Message-
> From: Brent Hilpert
> Sent: 31 March 2022 22:48
> To: r...@jarratt.me.uk; General Discussion: On-Topic and Off-Topic Posts
>
> Subject: Re: PDP 11/24 - A Step Backwards
>
> On 2022-Mar-31, at 2:14 PM, Rob Jarratt wrote:
> >> Those three comparators in the H777 a
On 4/2/2022 5:49 AM, Noel Chiappa via cctalk wrote:
> does [disabling the MCLK counter via DCLO, asserted by the two
> E126 monostable chain from ACLO] happen just on power-down, or on
> power-up too? I'd need to understand how that two monostable chain
> works in both cases,
Finally found time to get to this one...
> From: Rob Jarratt
> However, there is a puzzle. On the CPU I found that the track from the
> pull up resistor to E70 has been cut.
I don't know about the "pull up resistor" part, but I have several KDF11-U's,
and _all_ of them have the trace
On 2022-04-02 4:27 a.m., Liam Proven via cctalk wrote:
On Sat, 2 Apr 2022 at 00:34, Bill Gunshannon via cctalk
wrote:
And, as you say, an Arduino or a Pi that fits in my pocket is orders
of magnitude more powerful and costs pocket money.
The comparisons of size, power, storage, cost, power u
> -Original Message-
> From: cctalk On Behalf Of Rob Jarratt via
> cctalk
> Sent: 02 April 2022 11:58
> To: 'Noel Chiappa' ; 'General Discussion:
On-Topic
> and Off-Topic Posts'
> Subject: RE: PDP 11/24 - A Step Backwards
>
> >
> > Disconnect the bad ACLO, power it on, and see if the
You don’t strictly need an inhibit wire to write cores. You can write the core
with just the addressing lines. The inhibit wire is just there to simplify the
addressing electronics logic in early core memory, so you don’t need to have
per core control of the current in the address lines when wri
> It was quite a struggle to separate those nylon connectors, is there a
> trick to it?
You mean the Mate-n-lok's? Not really; just make sure the catch is released.
What did you do about DCLO? (Oh, I think I see the answer, below looks
like you're relying on the pullup on K3...)
> -Original Message-
> From: cctalk On Behalf Of Noel Chiappa via
> cctalk
> Sent: 03 April 2022 03:41
> To: cctalk@classiccmp.org
> Cc: j...@mercury.lcs.mit.edu
> Subject: RE: PDP 11/24 - A Step Backwards
>
> > It was quite a struggle to separate those nylon connectors, is there
a
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