Date   : Sat, 17 Oct 2009 00:58:52 +0200
From   : rick@... (Rick Murray)
Subject: ROM upgrades on the cheap

Dave Curran wrote:

> When I extended one of my Beebs, I followed Mark's instructions on the
> page you have linked to and extended it to give me a few more. I now
> have:
> [MOS] [4 ROMS images] [4 ROM images] [4 ROM images] [4 banks SW RAM]

Sweet! That's practically a B+.


> All four chips have links to the two address latches on IC76 and the
> SW RAM links to the write latch from IC77. I used 3 x 27c512 and a
> 1mbit SRAM chip (only half of which is used).

Have you thought about writing up a HOWTO? I am looking at 
http://www.pdcurran.co.uk/BBC/DSCF2800.JPG too.


> was vcc), soldered one socket in there and glued in a second
> freestanding socket for the other pin.

Yes, I love those extra pins floating there! When the chip is in place 
and hides the glue, it's quite surreal.


Best wishes,

Rick.

-- 
Rick Murray, eeePC901 & ADSL WiFI'd into it, all ETLAs!
BBC B: DNFS, 2 x 5.25" floppies, EPROM prog, Acorn TTX
E01S FileStore, A3000/A5000/RiscPC/various PCs/blahblah...