Author Topic: New yerar, new CPC board  (Read 56583 times)

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Offline CraigsBar

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Re: New yerar, new CPC board
« Reply #425 on: 16:40, 06 August 15 »
Yippee
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Offline skywalky

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Re: New yerar, new CPC board
« Reply #426 on: 13:55, 08 August 15 »
Updated BOM and list of important changes, http://www.eightbitclone.com/justcpc.html
What about the GAL? What is the program?

Offline Piotr

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Re: New yerar, new CPC board
« Reply #427 on: 14:11, 08 August 15 »
In home, here,  PAL16L8 - CPCWiki

Offline robcfg

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Re: New yerar, new CPC board
« Reply #428 on: 14:11, 08 August 15 »
As far as I remember, the gal program does the memory banking.

Offline TotO

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Re: New yerar, new CPC board
« Reply #429 on: 16:53, 08 August 15 »
Yes, it does. It was dumped from my 6128 PAL after I have contacted Charles McDonald, then Porchy.
He does the same with my DK'Tronics PAL too... So, both are available since for the community.
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Offline TFM

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Re: New yerar, new CPC board
« Reply #430 on: 01:01, 09 August 15 »
Yes, it does. It was dumped from my 6128 PAL after I have contacted Charles McDonald, then Porchy.
He does the same with my DK'Tronics PAL too... So, both are available since for the community.


Somehow I wished you could dump the Dobbertin memory expansion GAL too, but on the other hand... we got the X-MEM now!  :) :) :)


Thanks TotO! Great service for the community!
TFM of FutureSoft
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Offline radu14m

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Re: New yerar, new CPC board
« Reply #431 on: 10:29, 09 August 15 »

Great board !!! i love it :)@Piotr: is it possible to add a 6Mhz turbo switch ? :)

Offline TotO

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Re: New yerar, new CPC board
« Reply #432 on: 11:27, 09 August 15 »
Somehow I wished you could dump the Dobbertin memory expansion GAL too, but on the other hand... we got the X-MEM now!  :) :) :)
Thanks TotO! Great service for the community!
We should ask him for dumping your Dobbertin GAL. Sure the X-MEM exist, but better to do it for the posterity.
The fact is that most of them are read protected, but they own a special custom hardware to bypass that. (made for JAMMArcade.net PCB dump)

The DK'Tronics / DATEL PAL was easy to dump but the Amstrad PAL looked to be very custom and took some weeks to be able to make it working.
Porchy said me that was his more challenging dump to do. (unlinked pins 13, 14, 15 are internally used for magic [nb]More informations about Amstrad HAL chip reversing here. [/nb] features).
« Last Edit: 11:42, 09 August 15 by TotO »
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Offline Porchy

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Re: New yerar, new CPC board
« Reply #433 on: 23:55, 09 August 15 »
If you want to send me the chip for reversing then PM me and we can work something out.


The HAL16L8 from the 6128 was a huge challenge as it's the first time I'd come across a non registered chip that had latches, coupled with the fact I had no experience using the Amstrad made it hard work. I've since found many chips that use latches and also developed a way to check for them too.

Offline ronaldo

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Re: New yerar, new CPC board
« Reply #434 on: 21:24, 11 August 15 »
It has arrived some minutes ago! :D
 [ Invalid Attachment ]

Some quick questions, @Piotr:
  • Can I power it directly from a real Amstrad CPC Monitor? (CTM640/CTM644?)
  • The +5v Cable is power input? Can be powered from a MiniATX power source?
  • An AC/DC Adaptor with 12V/0.5A output would be okay? Is it recommended not to go below 2A output? (Specs: PRI 230V~50Hz 12W, SEC 12V -- 500mA 6VA)
Thank you! :D
« Last Edit: 21:48, 11 August 15 by ronaldo »

Offline TFM

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Re: New year, new CPC board
« Reply #435 on: 22:42, 11 August 15 »
If you want to send me the chip for reversing then PM me and we can work something out.


The HAL16L8 from the 6128 was a huge challenge as it's the first time I'd come across a non registered chip that had latches, coupled with the fact I had no experience using the Amstrad made it hard work. I've since found many chips that use latches and also developed a way to check for them too.


Awesome work!!!  :) :) :)
« Last Edit: 23:55, 15 August 15 by TFM »
TFM of FutureSoft
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Offline CraigsBar

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Re: New yerar, new CPC board
« Reply #436 on: 13:38, 15 August 15 »
Wrong, your board is ready to post today. Sorry.
And I collected it from the Post Office this morning. But I cannot get any life out of it. What are the power supply requiremets? I assume 5v about 2a but that's a guess.
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Offline fatbob

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Re: New yerar, new CPC board
« Reply #437 on: 14:27, 15 August 15 »
This  video appears to show it being powered by 12V 1.8A.

 [youtube]https://www.youtube.com/watch?v=eunGoVPqoWA[/youtube]

I am hoping to complete building mine either this afternoon or sometime tomorrow.

Offline CraigsBar

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Re: New yerar, new CPC board
« Reply #438 on: 15:31, 15 August 15 »
And I collected it from the Post Office this morning. But I cannot get any life out of it. What are the power supply requiremets? I assume 5v about 2a but that's a guess.
OK I got it working. 7.5v 2a

 Wonderful. Works perfectly with the x arcade [emoji3]
« Last Edit: 15:34, 15 August 15 by CraigsBar »
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Offline CraigsBar

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Re: New yerar, new CPC board
« Reply #439 on: 23:52, 15 August 15 »
OK @Piotr , Having had the board up and running today I noticed a couple of minor "Issues", Not sure how easily solveable these are but hopefully fairly...


1. When a Joypad is plugged in several keys on the keyboard generate 2 characters ('r' produces 're' for example and 'e' does 'e*Break*'


2. quite a few programs I have used demonstrate massive on screen interference. (CPM plus, Batman Forever are badly effected), in these there is lots of garbage marks on the screen - on Batman Forever they seem to match the Disc Activity but I cannot be sure.


The first on I can live with as seen in the photo above I won't be using the Joystick Port much as I will be setting up a custom X-Arcade TankStick definition to provide both Joysticks.


The second will limit what software I can use. See the picture below for an example.



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Offline TFM

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Re: New year, new CPC board
« Reply #440 on: 00:04, 16 August 15 »
The artefacts correspond to one CRTC position, looks like the CRTC reads &FF instead of V-RAM. Hope this can be fixed!
TFM of FutureSoft
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Offline CraigsBar

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Re: New yerar, new CPC board
« Reply #441 on: 02:59, 16 August 15 »
The artefacts correspond to one CRTC position, looks like the CRTC reads &FF instead of V-RAM. Hope this can be fixed!
You are not the only one. I hope @Piotr has a spare one as I really need one that works without the visual garbage. I can (and have) worked around the joystick issue with the programming function of the X-Arcade Tank stick. But the screen corruption is a deal breaker for me :(


Edit: OK Using a part from my Spares I have swapped out the CRTC - No difference so I returned mine to the Spares box and put back the original one in the board ;)

« Last Edit: 03:12, 16 August 15 by CraigsBar »
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Offline ronaldo

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Re: New yerar, new CPC board
« Reply #442 on: 10:38, 16 August 15 »
Have you tried powering you board with 9V? Piotr recommended 9-12 V: 7.5V could be not enough.

Offline CraigsBar

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Re: New yerar, new CPC board
« Reply #443 on: 13:02, 16 August 15 »
Yep. 7.5 to 12v all have the same symptom
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Offline CraigsBar

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Re: New yerar, new CPC board
« Reply #444 on: 14:48, 16 August 15 »
OK, apologies @Piotr , I never tested just the Just CPC without the xmem attached. I just did and everything is fine. Does anyone else have oddness when running a just CPC with an xmem?

Unfortunately I just got my power leads back to front and fried my xmem and X-mass :( it seems they really dislike 12v. @TotO , do you think they are fixable? Or should I just order new ones?
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Offline gerald

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Re: New yerar, new CPC board
« Reply #445 on: 14:53, 16 August 15 »
Unfortunately I just got my power leads back to front and fried my xmem and X-mass :( it seems they really dislike 12v. @TotO , do you think they are fixable? Or should I just order new ones?
This is why I do not like the JustCPC 9V power input !!!
Now for you X-cards, you have to hope that one component protected the others ....

Offline Token

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Re: New yerar, new CPC board
« Reply #446 on: 15:31, 16 August 15 »
.
« Last Edit: 15:34, 16 August 15 by Token »

Offline Token

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Re: New yerar, new CPC board
« Reply #447 on: 15:31, 16 August 15 »
Easy mistake, be careful! 6 months ago I did it with my second PCW 8512 mainboard with the wrong psu, 9V instead 5V. Now I have stickers with voltage on them. Luckily, the mainboard run 100%, only the main chip inside the extern keyboard was fried. (quite unexpected)

Offline CraigsBar

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Re: New yerar, new CPC board
« Reply #448 on: 16:28, 16 August 15 »
This is why I do not like the JustCPC 9V power input !!!
Now for you X-cards, you have to hope that one component protected the others ....
Ordering replacements is no biggy, let's face it, they are not expensive.

OK, the same screen corruption occurs with a symbiface connected as well. So I guess external ram is not quite correctly setup on the Just CPC. Time to get additional expansions for the just CPC I guess
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Offline Bryce

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Re: New yerar, new CPC board
« Reply #449 on: 16:43, 16 August 15 »
Sorry for sounding a bit sarcastic Piotr, but did you do ANY proper timing analysis or compatibility testing on the JustCPC or did you just  make a layout that fit on the board and have it produced?

Bryce.