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Old 12 November 2019, 20:10   #261
Mark sealey
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Quote:
Originally Posted by trixster View Post
Sadly my ACA500Plus doesn’t seem to work with my Z-500 at all

There has been reports of this and the Checkmate cases that comes with a Zorro adapter....they might have fixed the issue.
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Old 13 November 2019, 21:31   #262
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If it helps, this is the fix posted for the Checkmate Zorro adaptor:

Checkmate 1500 Plus ACA500+ Issue

An issue has been reported with certain ACA500+ accelerators refusing to boot, or only booting after several retries. In these cases, once the machine has booted it is usually stable. It appears to primarily affect later revision ACA500+ boards with a different type of 68000 CPU fitted. A potential fix has been identified by Edu Arana that eliminates the problems starting up the system with the ACA attached. This fix is described below.

Important: Modifying hardware like this always carries risks. Please do not attempt this unless you have the necessary tools and equipment to successfully carry out a job like this!


The nature of this fix is to improve the grounding of the ACA500+ board. While the Zorro-II / PSU control board has all the ground terminals connected to the system ground, it appears that this is not sufficient to protect the tight signal tolerances required by the later ACA500+ models. The ground plane of the Zorro riser is traversed by two signals used for the PSU control circuitry, which interrupts the continuous plane and results in a longer path for the ground between the Amiga and the ACA slot.
Fitting six short wires between the ground connections on the Amiga motherboard connector and those on the ACA connector provides a more direct ground path to the ACA500+, thus improving the signal integrity enough to allow booting of the ACA500+.
The ground connections in question are pins 13, 25, 37, 49, 61 and 73 on both the 86-pin connectors. Attention should be paid especially to the ACA connector, as the connector is a mirrorimage of the motherboard connector and therefore the odd-numbered pins are on the lower side, not the upper side as on the motherboard connector. Using six wires approximately 70mm in length, connect pin 13 of the motherboard connector to pin 13 of the ACA connector, pin 25 to pin 25 and so on, on the rear of the PCB. Take care while soldering so as not to short these connections to any other lines as doing so and powering it up could damage your hardware.

Rob Cranley, 02 November
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Old 17 November 2019, 01:32   #263
bugsymalone666
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So I spotted some blank PCB versions of this little Zorro slot adaptor on ebay and thought it may actually sort me out killing two birds with one stone.

I have towerised an A500 because of the keep fiddling meaning I didnt want to keep opening the case, one thing I do have is an a590 which I want to fit in the bottom of the case. The main issue is it would need to be remote/90degrees to the main A500 motherboard.

Obviously with this little Zorro Board would do a couple of things, firstly mean I can probably find another device for my making of an amazing amiga, but secondly would allow plugging in of my A590 motherboard remotely.

Now the questions:

How wide is the board? I want to see if it was possible to mount it+A590 at the bottom of my case, then have a ribbon cable with the A500 edge connector on.

Second part is the components that need to be fitted, this is a bare board I have seen, tried looking online at one of the links to the German website, but apparently I need to be a member of the website to look at it, I dont suppose there is a parts list anywhere?

I'd be quite interested in building some more stuff for my Amiga, even though my projects list is stacking up, as I have a TF530 to build and all the parts that I havent done yet!
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Old 18 November 2019, 11:38   #264
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@trixster
Interesting... It seems that the Checkmate version of the board has an issue with newer ACA cards that use a different 68000 compared to the original ACA500+. Which version do you have?

@bugsymalone666
I'm not familiar with those bare boards you're talking about, but I'm guessing it's Matze's board? It's very similar to my board, and both are based on much earlier adaptors that existed back in the day. There are a minimum of components needed - you can probably get away with not fitting the -5V regulator as I don't know of any Zorro cards that need it. You will need a couple of the resistors though as pull-ups, most of the capacitors, and the XOR gate chip which reproduces a missing clock signal.
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Old 18 November 2019, 15:45   #265
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Quote:
Originally Posted by bugsymalone666 View Post
So I spotted some blank PCB versions of this little Zorro slot adaptor on ebay and thought it may actually sort me out killing two birds with one stone.

I have towerised an A500 because of the keep fiddling meaning I didnt want to keep opening the case, one thing I do have is an a590 which I want to fit in the bottom of the case. The main issue is it would need to be remote/90degrees to the main A500 motherboard.

Obviously with this little Zorro Board would do a couple of things, firstly mean I can probably find another device for my making of an amazing amiga, but secondly would allow plugging in of my A590 motherboard remotely.

Now the questions:

How wide is the board? I want to see if it was possible to mount it+A590 at the bottom of my case, then have a ribbon cable with the A500 edge connector on.

Second part is the components that need to be fitted, this is a bare board I have seen, tried looking online at one of the links to the German website, but apparently I need to be a member of the website to look at it, I dont suppose there is a parts list anywhere?

I'd be quite interested in building some more stuff for my Amiga, even though my projects list is stacking up, as I have a TF530 to build and all the parts that I havent done yet!
https://www.ebay.com/itm/Amiga-500-500-Plus-Expansion-Port-Extender-Type-1-right-angle-90-degrees/333289773365?_mwBanner=1&ul_ref=https%3A%2F%2Frover.ebay.com%2Frover%2F0%2F0%2F0%3Fmpre%3Dhttps%253A%252F%252Fwww.ebay.com%252Fulk%252Fitm%252F333289773365%26rvr_id%3D0%26rvr_ts%3D7ec2070d16e0a4e907a3ff13ffdd73b4&ul_noapp=true&pageci=aa9ce453-c890-4e3a-a1b2-3a24ed4314dd
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Old 19 November 2019, 11:33   #266
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Quote:
Originally Posted by Mark sealey View Post
https://www.ebay.com/itm/Amiga-500-500-Plus-Expansion-Port-Extender-Type-1-right-angle-90-degrees/333289773365?_mwBanner=1&ul_ref=https%3A%2F%2Frover.ebay.com%2Frover%2F0%2F0%2F0%3Fmpre%3Dhttps%253A%252F%252Fwww.ebay.com%252Fulk%252Fitm%252F333289773365%26rvr_id%3D0%26rvr_ts%3D7ec2070d16e0a4e907a3ff13ffdd73b4&ul_noapp=true&pageci=aa9ce453-c890-4e3a-a1b2-3a24ed4314dd
Yeah I saw those, its how I started looking again. I was going to have a go at making my own, but have never done toner etch PCBs (or any, but do lots of soldering) I drew it up in cad, printed it and got everything in, but I am not confident.

This is the one I have now bought:

https://www.ebay.co.uk/itm/Matze-Ami...wAAOSwyDpb13AU

hopefully it'll be ok, may give me some options for mounting my stuff. I tried looking up the Matze design, but cant seem to get to anywhere with the information without registering with other websites.
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Old 19 November 2019, 12:00   #267
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@daedalus - I bought mine secondhand but I’m pretty sure it’s the newest revision. I’ll check the unit this evening to see if it has a a printed revision number
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Old 19 November 2019, 13:55   #268
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That's interesting, thanks... I'll check it out.
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