greg@ccwf.cc.utexas.edu (Greg Harp) (10/28/90)
I've been trying to figure out what was wrong with my BASEBoard A500 RAM
expansion (a 4MB trap door style board) and I've hit upon what I think
may be the problem...
First, let me say that I have 3MB installed on the board. When I boot up,
I have 512K and 1.8MB Fast, which is correct. Next, I use the "cram"
utility that comes with the board, which adds the extra RAM. I get a
250K (or so) chunk at $0f0000 and a 1MB chunk at $800000. I can't
use either of these...
According to the Amiga Real Time Monitor, I have four chunks of RAM total.
(This is correct.) One shows up as "Chip Mem" (of course), one as "Fast
Mem" and is addressed starting at $c00000. The other two, which are
on the top of the list, usually have a trashed name (often "NpNu" with
the two dots over the "u").
What I noticed is that the Chip RAM shows up with the attribute 0003.
The Fast Mem shows up as 0005. The other (addmem-ed) RAM shows up as
0004. This RAM never gets used, and my Amiga believes that it has run
out of memory when in fact none of the "other" memory has been used.
What I was wondering is, what do the different bits mean in a memory
attribute? The added RAM doesn't have the least significant bit set,
and that might the problem.
If I can get ahold of a source of info on what to do to add memory to
the list or at least change an attribute, I can write a program to fix
the problem.
If it's any help, I have a Rev. 5 motherboard, KS1.3, and a Fat Agnus
(512K chip).
BTW, I have verified with one other person that I have the board configured
correctly as far as we can tell. I have the Rev. 1.2 Gary board for
this expansion, though, and he doesn't. If anyone has a BASEBoard with
a Rev. 1.2 Gary board, I'd appreciate it greatly if you'd send me email.
Please help me!
Greg
---------------Greg-Harp---------------greg@ccwf.cc.utexas.edu----------------
AMIGA! //
// Don't you just hate those long signature files? I mean, there oughta
\X/ be a law. If I were in control, .sigs would get cut off if they weregreg@ccwf.cc.utexas.edu (Greg Harp) (10/28/90)
In article <38791@ut-emx.uucp> I write: >First, let me say that I have 3MB installed on the board. When I boot up, >I have 512K and 1.8MB Fast, which is correct. Next, I use the "cram" >utility that comes with the board, which adds the extra RAM. I get a >250K (or so) chunk at $0f0000 and a 1MB chunk at $800000. I can't >use either of these... Correction: I have a 1MB chunk at $800000 and a 255K chunk at $f40000. I don't know where I got $0f0000... Greg ---------------Greg-Harp---------------greg@ccwf.cc.utexas.edu---------------- AMIGA! // // Don't you just hate those long signature files? I mean, there oughta \X/ be a law. If I were in control, .sigs would get cut off if they were