New yerar, new CPC board

dirtybb · 02:18, 08 February 15

Totally amazing !

If there are some with 6128 specs, i'm on it .

Piotr · 09:18, 08 February 15

Subaru : Answer is : "PROTOTYPE" .

I built this board for check some things (and myself) ,of course on board is few errors. For example i made clock circut from schematic first version 464 on 7400, this clock not working well with 40010 so on board is glued circut on 74hcu04, few wrong connections with RAM memory,some wrong dimension and socket placement .
But board is small and cheap. Is really hard to do big board with all extensions without human errors. Display 6128 becouse i fit rom from 6128. I can install rom from 464, no problem

Board with Xmem

CraigsBar · 11:18, 08 February 15

Quote from: Piotr on 09:18, 08 February 15
Subaru : Answer is : "PROTOTYPE" . I built this board for check some things (and myself) ,of course on board is few errors. For example i made clock circut from schematic first version 464 on 7400, this clock not working well with 40010 so on board is glued circut on 74hcu04, few wrong connections with RAM memory,some wrong dimension and socket placement .
But board is small and cheap. Is really hard to do big board with all extensions without human errors. Display 6128 becouse i fit rom from 6128. I can install rom from 464, no problem

Board with Xmem

I like that too. But... As a 464 remake with no tape support then its restricted on available software. If you added an FDC and amsdos the resulting 664 or 6128 would be far more usable when adding drives and HxC emulators don't you think?

Joseman · 12:05, 08 February 15

Quote from: Piotr on 09:18, 08 February 15
For example i made clock circut from schematic first version 464 on 7400, this clock not working well with 40010 so on board is glued circut on 74hcu04...

I looked at the two schematics and you're right the 464 uses different circuitry to manage de 16mhz crystal than the 6128, i think that it's very very very curious, i wonder why this differents? timing?

i have a 464 with the 4007, if you need some multimeter test on it, let me know!!

@CraigsBar I think that piotr wants a bug free 464 (more easy if easy is the word) and then, add the 6128 expansions to the board, after all the 6128 it's a 464 with some cuts and addons

CraigsBar · 13:23, 08 February 15

Quote from: Joseman on 12:05, 08 February 15@CraigsBar[/url] I think that piotr wants a bug free 464 (more easy if easy is the word) and then, add the 6128 expansions, after all the 6128 it's a 464 with some cuts and addons

either way. This is an awesome project and so long as a ddi1 remake is also (still) available to order at the same time I guess I really want both lol.

Piotr · 17:16, 08 February 15

More tests, MX4 ,XMEM and DDI connected, run demo.

Joseman · 17:18, 08 February 15

Quote from: Piotr on 17:16, 08 February 15
More tests, MX4 ,XMEM and DDI connected, run demo.

it says that it's a private video...

Piotr · 17:55, 08 February 15

I change settings.

Joseman · 18:20, 08 February 15

what are you using to connect the cpc to the ips monitor?

rgb to hdmi converter / scaler?

Piotr · 18:26, 08 February 15

Nothing, it is TV/monitor so have scart socket.

Joseman · 20:17, 08 February 15

Really this project is simply amazing

Not long ago i've tried to start something similar but for not enough time for this task the project was always delayed and only started about 2-3% of the schematic.

I'm really really interested in this project, @Piotr i'll like to know what kind of rules you followed to interconnect the different chips, when i worked on my project, the principal doubt was in what order i'll put the chips, i mean, we now that on pc exist two big form factors, AT and ATX, when the pc moved from at to atx was because the components where better placed and the signals between critical components become shorter...

I don't know if on a cpc this is indifferent or the location of the chips can be better placed and optimized that amstrad did on his design...

what are your opinions about this?

Sykobee (Briggsy) · 20:32, 08 February 15

Nice solid SCART signal there, the MODE 2 ROM-hack works nicely.

Piotr · 20:51, 09 February 15

Several amendments , the board is already stable (i hope). Earlier hung up on demos.

DTC demo
Amstrad CPC 464 clone ,DTC demo running - YouTube

Batman demo also run all, earlier hung up.

Joseman, hmm i more practicial, i just connect wires and looking for smoke

Rules like in digital, capacitors for filtering, short clock signals etc.

Ast · 22:33, 09 February 15

Quote from: Joseman on 20:05, 07 February 15
Three words: impressive, amazing, astonishing

@Piotr how can you make sure that the board is 100% bug free, that is 100% cpc identical?

It must be very hard to test that all the lines are there and nothing is missing i suppose...

You just have to run great Cpc hardware demos as chany's vertical split, from scratch and still rising from vanity and some other great stuffs as overflow's demos using hardware featuring. I would also speak about s&koh remakes demo from Grim to see what's happenning...

Piotr · 22:44, 09 February 15

People,please this "child" is 4 days old

And after 4 days from born can walk , dont expect fly

Anyway:

Batman demo running complete, without artefact, hanging etc
DTC , running ok,
Still rising, running ok
Pheelone ok
From scratch, i'm not sure

So is good idea, becouse i'm newbie in CPC world, to give me name demo or game and i test it. Also for next board i need serious betatester.

Ast · 22:51, 09 February 15

I'm just speaking of Cpc hardware demos tests' just to see how it works....

Piotr · 23:09, 09 February 15

I know

and i thank you for your help and sugesstions

Is exactly what i need. Some help with software. I'm newbie in Amstrad world. Digging Pouet net for demos take time so is good to me recive list. I spend my time to do better board.

Ast · 23:21, 09 February 15

Take your Times, No problem, and do your best!

Overflow demos : s&koh, the other world intro, ...etc...
Semilanceata demo : s&koh remakes. You can find this demo in synergy 2 demo by impact (great hardware stuff demos from Cmp/iMPACT)
Try from scratch from vanity. It's also a great hardware test...
From Arkos : try the Megademo, demo is art.
From symbiosis (hello Prodatron), try Digital Orgasm.
From Chany/Nps, try dream demos....

Piotr · 23:34, 09 February 15

Cool, thank's for your support. This list made my job much easier . I stop waste time for search random Amstrad demos on Pouet.net like before. Is exactly what i need

Focus on board

Ast · 23:35, 09 February 15

If you need a bêta tester in France, I'm free to test it....

Joseman · 23:40, 09 February 15

Quote from: Piotr on 22:44, 09 February 15
Also for next board i need serious betatester.

If you need betatesters, count me in, i've knowledge of soldering, desoldering, multimeter, frecuencymeter, analog an digital electronic, flashing roms... i've spares of all the components to build a cpc, i've an amstrad cpc onto a pc tower with the original keyboard inside a pc keyboard, i play games every week on a real cpc and i know the precise behaviour of a lot of games on a real CPC.

if you want i can be one betatester

Subaru · 02:46, 10 February 15

Quote from: Ast on 23:35, 09 February 15
If you need a bêta tester in France, I'm free to test it....

Moi aussi.

Piotr · 11:20, 12 February 15

Tape loading module test

Joseman · 11:56, 12 February 15

Now the FDC please!

On the cpc6128 service manual, pages 28-29, there is the schematic for the disc drive "expansion", I suspect that is very similar than the DDI, even on this 6128 manual the FDC is apart from the main schematic

Service Manuals - CPCWiki

I think that it's good idea to implement the FDC like on a 6128 and not let it on a expansion card. I work/play a lot with my 6128-at and i know how sensitive is the FDC with bad data cables and too much connects that interfere between the floppy data and the cpc

Good work by the way

Piotr · 12:06, 12 February 15

FDC controller,

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