Date   : Tue, 16 Nov 2010 10:40:12 +0000
From   : list-a_cloud9.bbc-micro@... (Theo Markettos)
Subject: ROMs

In article <61DE03A2B60449FEAC618AEBDE30C0B4@...> you wrote:
> Most (all?) 28Fxxx devices are 12v for programming, so best to use a 29F010 
> or 29F040 for 5v operation. Also, keep in mind the sector sizes, the 
> AM29F010 for instance:
> 
> http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=6261425
> 
> is a 16k sector size, which is just right, as Beeb ROMs are 16k, but a 
> 29F040 will have 64k sectors, so when you want to reprogram one ROM, you 
> have to erase 4, and put the other 3 back manually.

Good point.  The AMD 28F020 appears to be blockless, so you have to erase
the whole thing in one go.  That's a bit of a pain.  I suppose you could do:

*FRLoad <rom1> <rom2> <rom3> <rom4> <rom5> ....

but that does require a working disc system.

Theo