5 Oct
2004
5 Oct
'04
9:21 p.m.
On Fri, 17 Sep 2004, Tony Duell wrote:
This is a really trivial question, but I wasn't
really a BBC micro hacker
in the old days,
I am planning some upgrdes to a BBC Model B+ (the fact that this
particular B+ lives in the bottom of an Acorn Cambridge shouldn't
matter...). One of them is to combine some of the ROMs (the B+ can take
27256 32K byte EPROMs), thus freeing up some ROM sockets and put a RAM
chip in one of them. I then have to fiddle the write-enable line [1] (should
be easy) and I have 32K of sideways RAM.
The hardware doens't worry me (I have schematics...). But how do I load a
ROM image into the sideways RAM?
Hi Tony,
*SRLOAD imagefile baseaddress pagenumber
e.g.
*SRLOAD MYROM.ROM 8000 7
is correct for a Master, however the page at
http://homepage.ntlworld.com/rpsprowson/bbc/software/manuals/webbc.txt
says that the correct form for a machine with sideways RAM is:
*LOAD imagefile 8000
After either of these you will need to perform a hard break (Ctrl-Break).
You can check whether this worked or not with the command
*ROMS
which lists all ROMS installed in the machine.
Is there some loader program I need (and
where do I get it)?
It's built in.
Anything I should know about the image file on disk
(anything about the start/end/entry addreeses in the direxctory, for
example)?
I believe the filename is all that's required.
This has worked for me on a MAster 128 with a copy of the Small-C Runtime
on floppy disk.
Regards,
Ed.