Anyone else make Mike Coates 2650 - Z80 adapter?
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/s2... <https://web.archive.org/web/20150929213440fw_/http://www.arcades.plus.com/s2650_fluke_adapter.htm>  Thanks! John :-#)# -- _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site 2005-Current: https://seven.pairlist.net/pipermail/techtoolslist/ Vectorlist Archives 1997/99 - 2016: https://www.vectorlist.org/
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/s2... <https://web.archive.org/web/20150929213440fw_/http://www.arcades.plus.com/s2650_fluke_adapter.htm>
 Thanks!
John :-#)#
-- John's Jukes Ltd. 7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 Call (604)872-5757 (Pinballs, Jukes, Video Games) flippers.com "Old pinballers never die, they just flip out"
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/s2... <https://web.archive.org/web/20150929213440fw_/http://www.arcades.plus.com/s2650_fluke_adapter.htm>
 Thanks!
John :-#)#
_______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site 2005-Current: https://seven.pairlist.net/pipermail/techtoolslist/ Vectorlist Archives 1997/99 - 2016: https://www.vectorlist.org/
Hi Mike, I tried this: 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 2650Â - I guess I should try that as it was floating. Thanks! John :-#)# On 2024/05/10 12:42 p.m., Mike Coates wrote:
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/s2... <https://web.archive.org/web/20150929213440fw_/http://www.arcades.plus.com/s2650_fluke_adapter.htm>
 Thanks!
John :-#)#
_______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site 2005-Current: https://seven.pairlist.net/pipermail/techtoolslist/ Vectorlist Archives 1997/99 - 2016: https://www.vectorlist.org/
-- John's Jukes Ltd. 7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 Call (604)872-5757 (Pinballs, Jukes, Video Games) flippers.com "Old pinballers never die, they just flip out"
On Fri, 10 May 2024 11:30:25 -0700 John Robertson via Techtoolslist <techtoolslist@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. From: David Gersic <info@zaccaria-pinball.com> To: "'Technical Tools Mail List'" <techtoolslist@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 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.
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@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@zaccaria-pinball.com> To: "'Technical Tools Mail List'" <techtoolslist@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.
-- John's Jukes Ltd. 7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 Call (604)872-5757 (Pinballs, Jukes, Video Games) flippers.com "Old pinballers never die, they just flip out" _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site 2005-Current: https://seven.pairlist.net/pipermail/techtoolslist/ Vectorlist Archives 1997/99 - 2016: https://www.vectorlist.org/
On Mon, 13 May 2024 06:05:37 -0700 John Robertson via Techtoolslist <techtoolslist@flippers.com> wrote:
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@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.
Interesting. I just looked back at the original article, and it should have INTACK tied to Ground. If Mike's adapter has it floating, that could explain the weird random data reads. Looking at the board schematic, INTACK puts 0x40 on the data bus. It does look like it should work. If you get it working, I'll have to get another one. I'm not sure I'd use it, but it would be nice to have.
participants (4)
-
David Gersic -
John Robertson -
John Robertson via Techtoolslist -
Mike Coates