Author Topic: CPC 464 prototype with Gate Array simulator board found  (Read 2745 times)

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Offline balford

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Anyone who's on FB should take a look at the following link (closed group, so you may need to join):
Amstrad CPC 464 group - prototype CPC

I've suggested the guy loans the machine to someone with expertise in reverse engineering the Gate Array simulator board, as far as I know it hasn't been done yet?

He intends auctioning it, so the more people who can suggest alternatives to stop it falling immediately out of public view the better!
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Offline Gryzor

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #1 on: 14:56, 27 October 21 »
Oh damn. I'm salivating. So what, start a wiki fund or something? Sure, why not. And then... what?
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Offline rastislavz

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #2 on: 15:02, 27 October 21 »
Exactly that was what I have suggested in the FB thread that we could fund it together.
Than somebody wise can analyse the board and make the ULA simulator on FPGA like similar custom chip replacements were made for other 8-bits, e.g. commodore.
The unit could be donated to some retro computer museum.
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Offline TotO

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #3 on: 15:10, 27 October 21 »
@gerald is called here.
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Offline Gryzor

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #4 on: 15:22, 27 October 21 »
The unit could be donated to some retro computer museum.
...and that's where the problem begins, probably...

I'm all for it, though. There are places where we can raise a common fund, once we agree on the administrator of the fund.
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Offline Gryzor

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #5 on: 15:23, 27 October 21 »
Oh well, never mind, it's already on ebay and with a 3-day limit *repeatedly slaps forehead*

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Offline TotO

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #6 on: 15:25, 27 October 21 »
<< this post can be deleted >>
« Last Edit: 15:43, 27 October 21 by TotO »
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Offline balford

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #7 on: 15:57, 27 October 21 »
Disappointing outcome. Hopefully it goes to someone who won't hide it away.
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Offline Gryzor

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #8 on: 15:57, 27 October 21 »
Wouldn't hold my breath :(
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Offline rastislavz

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #9 on: 16:48, 27 October 21 »
Oh well, never mind, it's already on ebay and with a 3-day limit *repeatedly slaps forehead*
Yeah 3 days is not much time to organize something... Guy wants to become rich as fast as possible. Its a pitty. These things usualy end up on somebodys shelf behind the glass.
« Last Edit: 16:52, 27 October 21 by rastislavz »
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Offline eto

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #10 on: 17:24, 27 October 21 »
I've suggested the guy loans the machine to someone with expertise in reverse engineering the Gate Array simulator board, as far as I know it hasn't been done yet?

As Roland Perry pointed out on FB, there are plenty of PLA chips, so even with this model, it's not easy to reverse engineer the Gate Array.

I was wondering, how compatible the KC Compact is. If I am not mistaken, the GDR engineers already did reverse engineer the Gate Array and replicated it with standard logic chips. WOuldn't that be a much easier way to reverse engineer the logic of the Gate Array? Except for the Gate Array they used either the original chips or clones, so I would expect, that their Gate Array logic should be close to identical.
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Offline gerald

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #11 on: 18:14, 27 October 21 »

@gerald is called here.
shout louder ! Notification does not seem to work   ;D
As Roland Perry pointed out on FB, there are plenty of PLA chips, so even with this model, it's not easy to reverse engineer the Gate Array.
Yes, at least 9 of them. But if these are just PAL (not using registers) it should be doable. With registers it will just make it a bit more complicated.
However the SOLD AS SEEN UNTESTED (MAY NOT WORK) is a big showstopper for me.


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Offline eto

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #12 on: 18:20, 27 October 21 »
Yes, at least 9 of them. But if these are just PAL (not using registers) it should be doable.

Have you ever thought about using the schematics of the KC compact? I had a quick look and it doesn't look like they have any PAL but only (many) standard logic ICs.
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Offline gerald

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #13 on: 19:03, 27 October 21 »
Have you ever thought about using the schematics of the KC compact? I had a quick look and it doesn't look like they have any PAL but only (many) standard logic ICs.
I must confess, I never look at the KC compact  :picard:
A quick look show that it is not an exact emulation of the CPC GA. Interrupt are coming from a z8536, mode 3 is different as well as some other bits (https://www.cpcwiki.eu/index.php/KC_Compact#Hardware_differences)
 
On the schematic, you can also see that they are using a 2716 eeprom as a PAL equivalent.
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Offline TotO

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #14 on: 20:05, 27 October 21 »
I think the Aleste 520 schematic is better for that.
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Offline xesrjb

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #15 on: 20:43, 27 October 21 »
At last jesus6128 Ebayer from Spain will get it for 1000 £…


xesrjb
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Offline Gryzor

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #16 on: 21:05, 27 October 21 »
Something like that probably...
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Offline TotO

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #17 on: 22:17, 27 October 21 »
The item condition will probably require to be fixed to work again if no issue from the GA board.
Sad to see the keyboard missing a key and was not the original. The same for the bottom case.
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Offline dragon

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #18 on: 00:22, 28 October 21 »
I'm not in the Facebook  group someone can put pictures?
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Offline Richard_Lloyd

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Offline Richard_Lloyd

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #20 on: 00:53, 28 October 21 »
https://www.theregister.com/Print/2014/02/12/archaeologic_amstrad_cpc_464/


The photos in this article have different coloured base and front just like the one for sale.......
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Offline 00WReX

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #21 on: 12:40, 28 October 21 »
The item condition will probably require to be fixed to work again if no issue from the GA board.
Sad to see the keyboard missing a key and was not the original. The same for the bottom case.
I think the bottom of the case is original. I have seen two others and they are the same. The key thing is that the production models had 5V 2A on the sticker...the development have 5V 1.5A.

Cheers,
Shane
« Last Edit: 12:44, 28 October 21 by 00WReX »
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The CPC in Australia...
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Offline Gryzor

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #22 on: 12:42, 28 October 21 »
Well, Perry says it's not an original, based on the label...
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Offline 00WReX

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #23 on: 12:45, 28 October 21 »
Well, Perry says it's not an original, based on the label...


He actually acknowledged what I said...


"Thanks for that information. There must be two generations of grey 464 - because I've seen ones without the black label on the base."
« Last Edit: 12:48, 28 October 21 by 00WReX »
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Offline Gryzor

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Re: CPC 464 prototype with Gate Array simulator board found
« Reply #24 on: 13:25, 28 October 21 »
Missed that comment. However that looks like a production label, it'd be weird if it belongs to a prototype, especially since other labels and markings are paper, half glued ones.
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