Date   : Mon, 20 Mar 2006 19:39:49 +0000
From   : "Ian Wolstenholme" <BBCMailingList@...>
Subject: Re: 1MHZ SCSI/ATA board

I have always used 27256 devices as a substitute for 2764s and 
27128s which are difficult to get hold of.  My EPROM programmer
(Morley v.2) will programme them correctly for a 16K ROM image
using either 27128 mode or 27256 HI mode.

Best wishes,


Ian

----- Original Message -----
From: Jules Richardson
To:  bbc-micro@...
Sent: Mon, 20 Mar 2006 15:33:22 +0000
Subject: Re: [BBC-Micro] Re: 1MHZ SCSI/ATA board

Phil Blundell wrote:
> On Wed, 2006-03-15 at 15:49 +0000, Jules Richardson wrote:
>> I know my board was seen to initialise *once* in previous hands though, and 
>> that has ROMs with 'M512' written on them. I've got images of them, so if it 
>> turns out yours doesn't like whatever M512 ROMs you have then I can always 
>> send copies of mine over...
> 
> Incidentally, what type are the actual ROMs in that board -- are they
> 27C64s like the M512? 

Yep, 8k x 8...

> Annoyingly, a quick rummage through my parts collection didn't turn up
> any 27C64s.  I see Farnell do still sell them, but they seem to be
> remarkably expensive.  Does anybody happen to have a stash of those
> chips that they'd be prepared to part with?

Bugger - I've got millions of the things, but I'm out in the US again for a 
while and so they're 4000 miles away right now!

It's 27128's I can never find when I need them - I seem to have just about 
everything else (although my programmer won't handle anything larger than 
1Mbit and is too new to cope with the old three-rail devices)

cheers

J.