Date   : Fri, 03 Jun 2011 23:00:53 +0100
From   : jumbos.bazzar@... (Mark Haysman)
Subject: SW-RAM Questions

...and to reply to my own question, I've now tried a 48Z35, and it works 
just fine.

Mark.

----- Original Message ----- 
From: "Mark Haysman" <jumbos.bazzar@...>
To: "bbc-micro List" <bbc-micro@...>
Sent: Saturday, May 28, 2011 1:26 AM
Subject: Re: [BBC-Micro] SW-RAM Questions


> Although I've not personally tried it (yet), a 48Z35 should also work, and
> give you internal battery backup, and power down protection all in one 
> chip.
> Then all you'd need to wire is the /WR, the extra address line, and a 
> switch
> for read disable, incase you crash it.
>
> Mark.
>
> ----- Original Message ----- 
> From: "Mike Pepper" <profpep@...>
> To: "bbc-micro List" <bbc-micro@...>
> Sent: Saturday, May 28, 2011 12:59 AM
> Subject: Re: [BBC-Micro] SW-RAM Questions
>
>
>>A fast answer is to plug it into one of these:
>>
>> http://pdfserv.maxim-ic.com/en/ds/DS1213D.pdf
>>
>> and then fit that as a part to the BBC. It does all the hard work for 
>> you.
>>
>> Thye also have a part called, 'Smart Watch' which has a real time clock 
>> as
>> well. I used one on my old BBC based heating controller. Not sure if the
>> watch variant comes in 32 pin though.
>>
>> ||\/||ike
>>
>>
>> ----- Original Message ----- 
>> From: "Matt Walker" <walker_matt@...>
>> To: <bbc-micro@...>
>> Sent: Friday, May 27, 2011 9:50 PM
>> Subject: [BBC-Micro] SW-RAM Questions
>>
>>
>>> Ok, few questions before I before I fit some sideways ram.
>>> Will this
>>>
>> http://pdf1.alldatasheet.com/datasheet-pdf/view/82765/CYPRESS/CY62256LL.html
>>> (this is the exact datasheet for the chips I have)
>>> work as described here     http://mdfs.net/Info/Comp/BBC/SROMs/32K/
>>> Is it the right speed etc?
>>>
>>> Also, is a battery backup for the SW-RAM as simple as 3 AAs and a diode
>>> connected to the GND and Vcc pins of the chip?
>>>
>>>
>>>
>>> _______________________________________________
>>> bbc-micro mailing list
>>> bbc-micro@...
>>> http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro
>>>
>>
>>
>>
>>
>> _______________________________________________
>> bbc-micro mailing list
>> bbc-micro@...
>> http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro
>
>
> _______________________________________________
> bbc-micro mailing list
> bbc-micro@...
> http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro