Used the unused pins 3, 4, 5, & 6 on the 74LS11 - didn't work, and I have other jobs I must do so will go back to it later. /MI was stuck High as I recall from an hour ago...but forgot to write it down...might have been /IORQ...

I did find that your board did not actually ground pin 34 of the 2650  - I guess I should try that as it was floating.

Thanks!

John :-#)#

Nowadays it has moved

https://macros-arcade.com/fluke-z80-to-s2650-pod-converter/

It works on a Zaccaria Invaders PCB, which is all I have ever used it on.

If you get INTACK working let me know, I can always update the layout
(especially if the gates needed are already on there!)

Mike

On 10/05/2024 19:48, John Robertson via Techtoolslist wrote:

INTACK is INTerrupt ACKnowledge and is generated by the 2650. So, how
does one get that out of a Z80 I wonder...
Reading Osborne's excellent An Introduction To Microcomputers Volume 2,
Some Real Microprocessors says this on page 7-10:

I'll try that  - I think there is a spare gate or two I can use..

If it works I'll report back!

John :-#)#

On 2024/05/10 11:30 a.m., John Robertson via Techtoolslist 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?

Here is Mike's article:

web.archive.org

S2650 Fluke Adapter <#>

🔗
https://web.archive.org/web/20150929213440fw_/http://www.arcades.plus.com/s2650_fluke_adapter.htm <https://web.archive.org/web/20150929213440fw_/http://www.arcades.plus.com/s2650_fluke_adapter.htm>

 Thanks!

John :-#)#

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