#Chip Memory
6 messages in this thread
Does anybody know if I change the jumper on my 4000 motherboard that says
2 or 8 megs(I think it said "chip"next to it) , and install a 8 meg
simm(if there is an 8meg simm) I would have 8 megs chip,and if the system
would use it?
// Gary B. Flying High From Oxnard,California
\\// On AutoPilot 1.72….Long Live The Amiga!
Gary >>Does anybody know if I change the jumper on my 4000 motherboard
that says 2 or 8 megs <<
Nope.
That jumper was added to the motherboard when the Alice chip was still
under development. The Alice was never upgraded to address more than
2-megs of CHIP, so the jumper is useless.
I've heard that the jumper can be used to REDUCE the amount of CHIP RAM to
only 1-meg.
Ron.
– ap'ing with AP. (Eagles may fly, but weasels aren't sucked
into jet engines.)
>>I've heard that the jumper can be used to REDUCE the amount of CHIP RAM
to only 1-meg.
Ooh… now THERE'S a highly needed feature! <g>
Chris – Fast and Low on my '020!
"Are we having fun yet?!?" -Anonymous A1200 User
If the Alice ever gets updated to access 8 megs then I could swap out the
Alice and change the jumper ?
// Flying high on Autopilot from Oxnard,California
\\// GARY B.
Gary >>If the Alice ever gets updated to access 8 megs then I could swap
out the Alice and change the jumper ?<<
I don't know.
It would require remapping of the CHIP RAM to another location. As is, if
the CHIP memory were to expand from a 2meg chunk to an 8-meg chunk, it
would overlap 6-megs of the Zorro-II memory area, leaving only 2-megs for
FAST memory.
If there were another jumper for remapping the CHIP memory into a reserved
area in the Zorro-III range, there wouldn't be a problem. I do remember
Dave Haynie talking about it being possible to design the Agnus/Alice to
see its CHIP memory area at a different location.
I don't think the Alice, was designed to physically access the extra
memory, and if not it wouldn't be pin comaptible once it was expanded.
Ron.
– ap'ing with AP. (Eagles may fly, but weasels aren't sucked
into jet engines.)
NoPe, that was an oPtion that was never imPlemented.
Sorry.
-Vree in Virginia