[Techtoolslist] Anyone else make Mike Coates 2650 - Z80 adapter?

[John Robertson]

On 2024/05/12 8:34 p.m., David Gersic wrote:
> On Fri, 10 May 2024 11:30:25 -0700
> John Robertson via Techtoolslist <techtoolslist at flippers.com> wrote:
>
>> I've had this adapter sitting on a shelf since 2004 and just found a
>> use for it when working on a Zaccaria pinball MPU. The problem is it
>> doesn't work and it looks like the 2650 CPU has to drive INTACK, but
>> it ties low in the original article on pages 9 &10 of
>> TroubleshooterV1-1983-combined-searchable.pdf (on ftp list under
>> Fluke/9XXX/Fluke Troubleshooter Magazine).
>>
>> Anyone else use this adapter or made one that works for Zac. games?
> I sent you that one. I never got it to work correctly, though. I had a
> thread here on it back in 2017.

Right, I have the correspondence but forgot about it. Must be getting 
older...

I also only brought out the two Zac pins in the last few months, didn't 
have a customer in 2022 for them. Now I do, so getting them all cleaned 
up - finally.

I did find that the INTACK wasn't grounded as shown in the original 
Fluke Troubleshooter - it was floating, so I shall try tying it high to 
disable the Data Bus read - that may be my problem. It really looks like 
it should work.

Thanks!

John :-#)#

>
> From: David Gersic <info at zaccaria-pinball.com>
> To: "'Technical Tools Mail List'" <techtoolslist at flippers.com>
> Subject: [Techtoolslist] Slowing down a Fluke Z80 pod?
> Date: Sun, 17 Sep 2017 11:38:49 -0500
>
>
> If you do get it to work, I'd be curious to know how. I don't think
> INTACK is all that important, at least not for this use. You can('t) run
> the board with UUT. INTACK only matters if you're expecting INT to
> happen, and without the CPU actually running, there wouldn't be any use
> for INT.
>
>
>

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