[Coco] Re : Re : FREE Services For Members Of The CoCoList at Malted Media

[Sylvain Rousseau]

Yes,  Mr. Merchberger host it for we at this address:

http://zmerch.30below.com/coco/coco3sram.pdf 

Thank you again Mr. Merchberger.

Sylvain



----- Message initial ----
De : Mark Marlette <mark at cloud9tech.com>
À : coco at maltedmedia.com
Envoyé le : vendredi 20 avril 2007, 13 h 16 min 11 s
Objet : Re: [Coco] Re : FREE Services For Members Of The CoCoList at Malted Media


IIRC there were some level problems in your circuit.

I think you posted a .jpg of it. I looked at it quickly. Don't totally  
remember.

Working other designs and sometimes they all run together. Heck maybe  
it was my levels that were off.... :)

Mark

Quoting coco at yourdvd.net:


> What 512k static ram are you using? the first to hit the scene were

> semistatic requiring something like an 8ms? refresh or so (these were

> hitachi). The current ones are fully static. The 4464 used in the 128k

> machine use a bidirectional i/o line like the static rams. The 41256

> has a seperate din and dout line but these are shorted together in the

> coco 3 memory circuit. did you account for the 256k bank switch?

>

> if all else fails you can make one of these:

> ftp://ftp.maltedmedia.com/coco/TUTORIALS/How_To_Upgrade_To_512k_Without_A_Commercial_Memory_Board.zip

>



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