Date   : Fri, 27 Mar 2009 19:23:44 +0000 (GMT)
From   : itonks@... (Ian Tonks)
Subject: A quick question about EPROM programming

Thanks Pete,

the plan is to change the voltage regulator in the programmer and I can use
it for 12.5v parts with a twist of a variable resistor.

I suppose I have a related question, can I drop in a 27512 for example, tell
the programmer it's a 27128 and expect it to work like one? Obviously I wouldn't
be using the full capacity of the EPROM. 27128 are getting a bit harder to
get hold of...

Cheers,

Ian



----- Original Message ----
From: Pete Turnbull <pete@...>
To: bbc-micro@...
Sent: Thursday, 26 March, 2009 17:21:41
Subject: Re: [BBC-Micro] A quick question about EPROM programming

On 26/03/2009 16:13, Ian Tonks wrote:
> Hi all.
> 
> There seems to be a choice between EPROMs that program at 12.5v or 21v.
Other than the voltage difference, does anyone know if the programming algorithms
or anything else are different for a given EPROM, say a 27128?

Different makes have slightly different "fast" algorithms, but if you 
use a basic programming algorithm that should work for virtually any 
27128 (or 27C128 or 2764, etc).  That's not quite true of all 27256 and 
bigger, though.

-- 
Pete                        Peter Turnbull
                        Network Manager
                        University of York

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