Date   : Mon, 27 Nov 2006 18:13:58 +0000
From   : pete@... (Pete Turnbull)
Subject: More sideways RAM questions

BRAHMS wrote:

> 1) Why does *LOAD not work (it seems to on other machines, I remember 
> thats how I used to load my ROMS at school!)

It depends on how your sideways RAM works.  Some (like the ATPL boards) 
have additional circuitry so that a memory write is always forced to the 
RAM bank regardless of the ROM slot currently selected, but some 
doesn't.  When you do a *LOAD from a filing system, the filing system 
ROM is enabled during the load operation.

> 2) 8*2kOSGBPB seems to be about as slow as doing 16k*OSBGET - is this right?

No, that smacks of a poor OSGBPB implementation.  Or an extremely good 
OSBGET :-)

> 3) Still no identification on the actual type of RAM.
> 4) The RAM shows up at slots 14, 12, 6, 2 - are these slots likely to be 
> the same RAM duplicated, so far I've not managed to load 2 ROMs at once 
> but it could be my dodgy loader!

That would seem to be the same slot duplicated.  Presumably, only 2 bits 
of the four possible are being decoded, which is exactly what I'd expect 
if you haven't got a proper expansion board.


-- 
Pete                                           Peter Turnbull
                                               Network Manager
                                               University of York