Date   : Fri, 25 Jul 2008 09:56:33 +0100
From   : bbcmailinglist@... (Ian Wolstenholme)
Subject: EEPROM writing in SW rom bank?

I'm not sure if this would be possible, or at least, as straightforward as it
might appear to sound.  Presumably if you could just plug an EPROM into
an SROM socket and connect a lead between the write line and pin 8 IC77
or similar, then there wouldn't have been much of a market for EPROM programmers.
And also, I expect you'd find hundreds of user modified Beebs with a permanent
connection made between the two points, and probably a ZIF socket in the
ROM slot as well so that the user could programme his own EPROMs at will.

You can definitely do it with RAM chips of the type 62256, but of course
that's only for temporary loading of images in to sideways RAM.

Best wishes,



Ian

----- Original Message -----
From: Charlie.Robson@... [mailto:Charlie.Robson@...]
To: bbc-micro@...
Sent: Thu, 24 Jul 2008 14:48:52 +0100
Subject: [BBC-Micro] EEPROM writing in SW rom bank?

Greetings,

I'm trying to write an EEPROM by connecting a flying lead from the /WE
line as one would for a RAM chip. Needless to say it's not working for
me else I wouldn't be asking for help here :)

Has anyone attempted to do anything like this with any degree of
success or am I barking up the wrong tree? Or just barking?

I'm sure the parameters of the chip - an atmel 28c64 - are compatible
with what I'm trying to achieve, but it resolutely refuses to program.

I'm using a standard BBC B.

All help greatly appreciated

C





Sophos Plc, The Pentagon, Abingdon Science Park, Abingdon,
OX14 3YP, United Kingdom.

Company Reg No 2096520. VAT Reg No GB 348 3873 20.


_______________________________________________
bbc-micro mailing list
bbc-micro@...
http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro