works.
Sorry for the noise.
Regards
Rob
> -Original Message-
> From: Guy Dunphy
> Sent: 01 May 2022 01:22
> To: r...@jarratt.me.uk; Rob Jarratt ; General
> Discussion: On-Topic and Off-Topic Posts
> Subject: Re: Testing a 74S240
>
> At 11:25 PM 30/04/2022
At 11:25 PM 30/04/2022 +0100, you wrote:
>In trying to fix my M7133 CPU from my 11/24 I thought I had identified a
>failed 74S240. However, when I replaced it (while adding a socket), the
>fault remained. So, I guess the original chip may not be faulty. I decided
>to test the original chip on a bre
On 2022-04-30 19:25, Rob Jarratt via cctalk wrote:
In trying to fix my M7133 CPU from my 11/24 I thought I had identified a
failed 74S240. However, when I replaced it (while adding a socket), the
fault remained. So, I guess the original chip may not be faulty. I decided
to test the original chi
> On 04/30/2022 5:25 PM Rob Jarratt via cctalk wrote:
>
>
>
> I noticed that the chip (original and replacement) was drawing 100-110mA
> from the bench PSU, which seems a bit high.
>
>
>
> I wondered if I might need a pull up resistor on the output, but my
> understanding is that this i
In trying to fix my M7133 CPU from my 11/24 I thought I had identified a
failed 74S240. However, when I replaced it (while adding a socket), the
fault remained. So, I guess the original chip may not be faulty. I decided
to test the original chip on a breadboard to see if it is OK. This is where
I g
