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

[coco at yourdvd.net]

I see what I believe may be some potential problems with the schematic
but before I go and make a fool of myself, I am going to go fetch the
data sheet for the sram and examine the gime memory timings. I'll get
back to you in a few hours. -rob

> -------- Original Message --------
> Subject: [Coco] Re : Re : FREE Services For Members Of The CoCoList at
> Malted Media
> From: Sylvain Rousseau <surtoutnombliepas at yahoo.ca>
> Date: Sat, April 21, 2007 4:22 pm
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> 
> 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  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
> > Découvrez ce qui fait jaser les gens ! Visitez les groupes de
> l'heure sur Yahoo! Québec Groupes. http://cf.groups.yahoo.com/ -- Coco
> mailing list Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco