Author Topic: X-MEM, a new memory expansion for all CPC.  (Read 87645 times)

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Offline Prodatron

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #50 on: 16:49, 05 May 14 »
So I was wondering as I have a 464 + DDI is there someway I can still use both this and the DDI? or do I have to wait for Bryce to develop a DDI-2 which has a passthrough so that other devices can be attatched after the DDI?
You can also try this:
MotherX4 Board - Cent Pour Cent

GRAPHICAL Z80 MULTITASKING OPERATING SYSTEM

Offline awergh

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #51 on: 06:36, 07 May 14 »
I was thinking that the MotherX4 Board would be nice but I would need two edge connectors and it only offers one for sale with it unless I'm missing something?

Offline Bryce

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #52 on: 10:18, 07 May 14 »
Has anyone ever had a batch of reversiboards made up recently?

I made two or three of them last year because I happened to have a few suitable edge PCBs left over, but no other batch has been made as far as I know. I found (and lost again) a source for the PCB a while back.

Bryce.

Offline pelrun

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #53 on: 10:55, 07 May 14 »
Couldn't you just add the appropriate IDC connector to the middle of the DDI-1 cable? Then it'd just plug into the passthrough on the back of the MX4, without sacrificing the original connector or needing a rare edge adapter.


Or am I mistaken and the MX4 has a different pinout to the expansion port?

Offline Bryce

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #54 on: 12:31, 07 May 14 »
The DDI-1 doesn't have a cable, it's connected directly to the back of the CPC.

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Offline TotO

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #55 on: 13:48, 07 May 14 »
The MX4 don't have an Edge pass-through to avoid contact problems.
An idea is to plug a male/male pcb on an edge ribbon cable to invert the gender. (I have to done it)
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Offline MacDeath

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #56 on: 17:51, 07 May 14 »
I guess a Motherx4 compatible card with all those floppy controller extras and possibility to connect at least 2 standard Floppies (3"1/2, 3" or 5"1/4) drives or HxC could be nice, would be usefull for any 464 owner, not for 664/6128 though... still.

Offline IanS

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #57 on: 22:12, 07 May 14 »
Are we all talking about the same thing. This is what I mean:-
 [ Invalid Attachment ]
(This shows 2 boards, both sides shown).

It can be inserted in an IDC connector added on a 50-way ribbon cable, to reproduce the edge connector on the cpc. With just straight through tracks, the signals end up on the wrong side.

Offline TotO

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #58 on: 22:17, 07 May 14 »

Yes, exactly that.  8)
(easy to build and should be sold around 2€ each, may be less... Depending the quantity)
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Offline TFM

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #59 on: 22:38, 07 May 14 »
Well, I can only strongly suggest to move to 50 pin Centronics connectors like German CPCs had, and later on the 6128 Plus too.
The reason is that PCB edge contacts are always submitted to corrosion.

TFM of FutureSoft
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Offline Bryce

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #60 on: 15:43, 08 May 14 »
It can be inserted in an IDC connector added on a 50-way ribbon cable, to reproduce the edge connector on the cpc. With just straight through tracks, the signals end up on the wrong side.

That depends how you intend to use the PCB. I used a straight through version to make this: Expansion Converter - CPCWiki

Bryce.

Offline MacDeath

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #61 on: 16:16, 08 May 14 »
Quote
Well, I can only strongly suggest to move to 50 pin Centronics connectors like German CPCs had, and later on the 6128 Plus too.
not everyone would be willing to modify a collector machine...

Anyway As I said, TotO just need to produce a FDC card that would be simply compatibeule with the Motherx4, then any standard disk solution and standard (non edge connector) cable may work well... the FD1 for 464 may then go to museum and 464 possessors would simply use HxC, cheap Chinses or 3"1/2 or bare 3" disk drive solutions.

Is there still free room inside the big programable chip on those X-Mem to add the FDC feature ?
sorry, don't know how this work so it may not be possible of course, just a suggestion.

Offline Bryce

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #62 on: 17:33, 08 May 14 »
The FDC functionality is just 16K preferably in ROM slot 7, so yes, there is no problem adding the OS. However, it would be better to include the OS on the FDC PCB so that it doesn't depend on other expansions to work.

If you mean adding all the FDC circuitry to the X-MEM CPLD, this wouldn't be possible, the X-MEM would need a lot of additional hardware to become a floppy controller.

Bryce.
« Last Edit: 17:35, 08 May 14 by Bryce »

Offline TotO

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #63 on: 19:13, 08 May 14 »
Yes, the FDC board have to provide its own Firmware. (AMSDOS or other if needed)
I have made some schematic tries, but I don't plane to release an MX4 FDC board actually.
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Offline MacDeath

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #64 on: 19:33, 08 May 14 »
Quote
However, it would be better to include the OS on the FDC PCB so that it doesn't depend on other expansions to work.
Well, a 464 would need both Extra RAM and FDC/Disk to be suitable to my taste...

such FDC card + X-MEM on a Motherx4 combo would be mandatory to turn any 464 into a proper CPC anyway.  ;D

But hey, TotO must be quite busy building all those X-Mem that were purchased... thats a lot of pieces to craft.
And a lot of 64kers turned into 576kers already... i guess... ;)
« Last Edit: 19:37, 08 May 14 by MacDeath »

Offline TFM

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #65 on: 21:11, 08 May 14 »
not everyone would be willing to modify a collector machine...
Not the machine.  :)  But anything "after" it :) .
TFM of FutureSoft
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Offline TotO

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #66 on: 12:34, 11 May 14 »
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Offline Gryzor

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #67 on: 21:15, 11 May 14 »
Damn, when did I preorder? :D

Offline TotO

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #68 on: 21:45, 11 May 14 »
On the firsts... Your board is ready. :p
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Offline TFM

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #69 on: 23:48, 11 May 14 »
A little update...  ;D
X-MEM preorders (updated) - Cent Pour Cent


Awesome site! Absolutely professional!!!

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Offline TotO

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #70 on: 00:35, 12 May 14 »
Thank you for the compliment, but... this place will stay a convenience. :)
Don't forget that, because it's a hobby. Like building the boards, notices, floppies.
Back in good old 1985 Marty!  ;D
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Offline Gryzor

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #71 on: 09:46, 12 May 14 »
On the firsts... Your board is ready. :p


How cool is that! :) Does it have my name on it?

Offline TotO

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #72 on: 09:57, 12 May 14 »
How cool is that! :) Does it have my name on it?
I can try to engrave it, but that should cut some tracks...  :laugh:

I have put the "final" version of the X-MEM Get Started! notice online.
All the others downloads will follow... Just check the bottom page of each boards.
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Offline Gryzor

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #73 on: 11:29, 12 May 14 »
I can try to engrave it, but that should cut some tracks...  :laugh:



From the looks of it it's got plenty of tracks, I'm sure not ALL of them are needed?

Offline TotO

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Re: X-MEM, a new memory expansion for all CPC.
« Reply #74 on: 12:00, 12 May 14 »
Absolutely!  8)
Most of them are only here to justify its indecent price[nb]See spanish forum...[/nb] and fight against Tipiaks[nb]Pirates!!![/nb].
« Last Edit: 12:03, 12 May 14 by TotO »
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