Re: 6540 Select Signals (Was: Re: 6550 pinout?)

I think your design will work.
I see that you also use the CLK signal.
In the rom adapters I have made, I have omitted that signal and it never 
gave any troubles.
Only when replacing the 6550 ram with a standard type of ram, I used the CLK 
signal to 'sync' the R/W signal of the new ram.

Regards,
donni


----- Original Message ----- 
From: "Jim Brain" <brain@jbrain.com>
To: <cbm-hackers@ling.gu.se>
Sent: Monday, August 24, 2009 5:22 AM
Subject: Re: 6540 Select Signals (Was: Re: 6550 pinout?)


> donni wrote:
>> Hello Jim,
>> If you have a look at the schematic at zimmers.net, you can see that
>> all the 6540 rom have the same chip select configuration:
> I know, and that's how I read it as well.
>> Schematic of 6540 roms replacement:
>> http://img13.imageshack.us/img13/3223/6540romreplacementwith2.gif
> Might you have a chance to look at my schematic:
>
> http://www.jbrain.com/vicug/gallery/ROM-el/6504_ROM_el_schematic
>
> And see if my logic is correct?
>
> Jim
>
>
>       Message was sent through the cbm-hackers mailing list


--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.409 / Virus Database: 270.13.64/2321 - Release Date: 08/23/09 
06:18:00


       Message was sent through the cbm-hackers mailing list