Date   : Sat, 28 May 2011 01:26:05 +0100
From   : jumbos.bazzar@... (Mark Haysman)
Subject: 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?
>>
>>
>>
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>>
>
>
>
>
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