Well you did do a lot of fiddling around with it for the Ryan ;)
Simon Cooke <[EMAIL PROTECTED]> wrote:
Simon Cooke <[EMAIL PROTECTED]> wrote:
IIRC, the XMEM line goes low when the external memory area is addressed
(upper 32k of the memory map, with external memory turned on in HMEM).
The external memory addressing is controlled by two latches at ports 128 and
129 (XMEML and XMEMH), which decide which 16k page of the external memory is
paged into the section between 32768 and 49151 (XMEML), and 49152 to 65535
(XMEMH).
And yes, I wish I could ditch that info from my brain to make room for other
stuff - like maybe recipes for interesting kinds of jello.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Edwin Blink
Sent: Tuesday, March 23, 2004 2:51 PM
To: sam-users@nvg.ntnu.no
Subject: /XMEM
Thanks for trying. Nev,Geoff
I was looking for info about the /XMEM signal as the manal is not very
informative.
Does anybody know the implementation of it? or has a schematic of the 1Meg
expansion or original Soft Rom board in which this signal is also used ?
Edwin
