CPC 464 Cost Down schematics.

[68k-dude]

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

[68k-dude]

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.

[68k-dude]

Here is an album of images.  If it works.


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

Those paying close attention may have noticed other interesting things.

Enjoy.

[Gryzor]

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?

[Bryce]

Very neat solution.

Bryce.

[dragon]

Beautilful pics,(and hard to do).


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

[68k-dude]

Hi Dragon

I would be interested in the details of that shop.

Thanks

68k

[dragon]

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

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

[Bryce]

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

Bryce.