Evening All.
So I've got WinCPLD loaded up on my Windoze laptop and am going to learn CPLD programming.
But since there are so many fake or faulty GAL chips out there im going to write a small program that tests the Gal inputs and outputs.
I could use simple switches and Leds but that wouldn't be as much fun, so my idea is to use an Arduino to toggle the inputs and check the outputs are as expected.
What is it that you guys find fails with the fake Gals? Is it just they are simply dead or something else?
Learning CPLD and testing GALs
Learning CPLD and testing GALs
If it ain't broke, test it to Destruction.
Re: Learning CPLD and testing GALs
They mostly fail erase, or programming, or don't program at all, but almost certainly they are not the speed printed on them!
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Learning CPLD and testing GALs
Ok, so erase, prigram, test operation for the first test.
I'll have to have a think about how to test the speed.
If it ain't broke, test it to Destruction.
Re: Learning CPLD and testing GALs
I think how I did it was just test a inverter, and look on the scope of the before and after to check the speed.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Learning CPLD and testing GALs
I know that the counterfeit/fake marking is a growing problem with many components but are there any legitimate distributors who can still sell these?
I saw that Farnell has a limited number of some GAL/PAL devices (e.g. 20R8 IIRC) but not of the ones I've been after (22V10 for example).
Following on from comments on one of TF's threads, I'm not suggesting that we post anything publicly on here but some indication of sellers (and likely success rates) would be useful.
Maybe the information could be managed less publicly (e.g. by PM or similar) compared to just posting on the forum?
I saw that Farnell has a limited number of some GAL/PAL devices (e.g. 20R8 IIRC) but not of the ones I've been after (22V10 for example).
Following on from comments on one of TF's threads, I'm not suggesting that we post anything publicly on here but some indication of sellers (and likely success rates) would be useful.
Maybe the information could be managed less publicly (e.g. by PM or similar) compared to just posting on the forum?
Re: Learning CPLD and testing GALs
AFAIK nobody sells them anymore.. Don't go with the Atmel ones, geeze... https://www.ecstaticlyrics.com/electronics/ATF22V10C/
I am however going to try and put some tested used ones in my store at some point soon...
I am however going to try and put some tested used ones in my store at some point soon...
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Learning CPLD and testing GALs
I think my first (and so far only) requirement for them is to give the HD support to the two H4 boards...
Minor deviation from the topic...so feel free to move somewhere more appropriate if you deem fit!...
I know the H4 can swap drive A/B via jumpers (and so on demand via a switch) but is there any way to make it override the drive select setting on the floppy itself?
I have some HD floppy drives from various PCs etc. and would like to use them with the H4 boards...but not all of them have an accessible drive select jumper (or at least not one I can find).
Minor deviation from the topic...so feel free to move somewhere more appropriate if you deem fit!...
I know the H4 can swap drive A/B via jumpers (and so on demand via a switch) but is there any way to make it override the drive select setting on the floppy itself?
I have some HD floppy drives from various PCs etc. and would like to use them with the H4 boards...but not all of them have an accessible drive select jumper (or at least not one I can find).
Re: Learning CPLD and testing GALs
@JezC you can force 1.44MB all the time if thats what you mean ?
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Learning CPLD and testing GALs
@exxos No, but good to know anyway.
From what I've seen/read, most 3.5" floppy drives for a PC have the DS1 jumper set but the ST needs it set for DS0 instead so I was wondering if we could 'correct' the DS jumper setting on the H4/floppy cable somehow, rather than having to mod the floppy itself.
Re: Learning CPLD and testing GALs
I cannot remember if it was tested, but any drive should work on the H4 without needing to change the jumper...JezC wrote: ↑Thu May 21, 2020 10:59 pm @exxos No, but good to know anyway.
From what I've seen/read, most 3.5" floppy drives for a PC have the DS1 jumper set but the ST needs it set for DS0 instead so I was wondering if we could 'correct' the DS jumper setting on the H4/floppy cable somehow, rather than having to mod the floppy itself.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.