Print Page - CPC 464 Cost Down schematics.

Title: CPC 464 Cost Down schematics.
Post by: 68k-dude on 18:44, 20 August 11

I have a sick 464 in need of assistance. It is a cost down rev.4 board. Does anyone have or know where I can get a schematic diagram for this board. I fear there is much to do to get it working.

The memory fitted to the board was two MT4067-12 4 bit dram ICs. I have seen pictures of this board with the memory being made up of eight 1 bit modules but not this one. The memory ICs have gone low resistance and get very hot very quickly. I do not have replacements so am going to either populate the bank of eight or make a 30pin simm fit in there.

Thanks in advance

68k

Title: Re: CPC 464 Cost Down schematics.
Post by: 68k-dude on 08:32, 21 August 11

I've sorted it. I used an old 1Meg 30pin simm. I spent a good few hours soldering wires from the ram sockets to the simm. I now have a working 464 with 1MB of ram. I'll put a picture of the before and after shots. Worth a laugh if nothing else.

Title: Re: CPC 464 Cost Down schematics.
Post by: 68k-dude on 09:10, 21 August 11

Here is an album of images. If it works.

http://imageshack.us/g/13/dscf4191zxt.jpg/ (http://imageshack.us/g/13/dscf4191zxt.jpg/)

Those paying close attention may have noticed other interesting things.

Enjoy.

Title: Re: CPC 464 Cost Down schematics.
Post by: Gryzor on 10:13, 21 August 11

Heheheh, this is precious! Some serious bank switching is needed...

Btw, doesn't the use of wires insert timing problems? Or, rather, at what length does it start to do so?

Title: Re: CPC 464 Cost Down schematics.
Post by: Bryce on 10:52, 21 August 11

Very neat solution.

Bryce.

Title: Re: CPC 464 Cost Down schematics.
Post by: dragon on 14:20, 22 August 11

Beautilful pics,(and hard to do). ;D

Oh sorry,I know shops sell 4164 ram(new).I read the post to late :(.

Title: Re: CPC 464 Cost Down schematics.
Post by: 68k-dude on 21:01, 22 August 11

Hi Dragon

I would be interested in the details of that shop.

Thanks

68k

Title: Re: CPC 464 Cost Down schematics.
Post by: dragon on 20:06, 23 August 11

o.k.But,If you buy here,buy a big order,because the cost of ship is big to europe.

http://www.cetronic.es/sqlcommerce/disenos/plantilla1/seccion/Catalogo.jsp?expand=0&seccion=catalogo&idIdioma=1&cPath=1147&idTienda=93 (http://www.cetronic.es/sqlcommerce/disenos/plantilla1/seccion/Catalogo.jsp?expand=0&seccion=catalogo&idIdioma=1&cPath=1147&idTienda=93)

usa shop:

http://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDrillDownView?langId=-1&storeId=10001&catalogId=10001&categoryName=cat_1050&subCategoryName=ICs%20%26%20Semiconductors%20%2F%20Memory%20%2F%20DRAM&category=105010 (http://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDrillDownView?langId=-1&storeId=10001&catalogId=10001&categoryName=cat_1050&subCategoryName=ICs%20%26%20Semiconductors%20%2F%20Memory%20%2F%20DRAM&category=105010)

Title: Re: CPC 464 Cost Down schematics.
Post by: Bryce on 08:37, 24 August 11

Here's my retro RAM supplier (in Germany): http://www.hinkel-elektronik.de/shop/2619.html (http://www.hinkel-elektronik.de/shop/2619.html)
Might also be of use to you.

Bryce.

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General Category => Amstrad CPC hardware => Topic started by: 68k-dude on 18:44, 20 August 11